CN117825367A - Water quality parameter monitor and monitoring method - Google Patents
Water quality parameter monitor and monitoring method Download PDFInfo
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- CN117825367A CN117825367A CN202410245122.0A CN202410245122A CN117825367A CN 117825367 A CN117825367 A CN 117825367A CN 202410245122 A CN202410245122 A CN 202410245122A CN 117825367 A CN117825367 A CN 117825367A
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- digestion
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 231
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000012544 monitoring process Methods 0.000 title claims abstract description 18
- 230000029087 digestion Effects 0.000 claims abstract description 407
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 346
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 206
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 206
- 239000011574 phosphorus Substances 0.000 claims abstract description 206
- 238000006243 chemical reaction Methods 0.000 claims abstract description 192
- 239000007788 liquid Substances 0.000 claims abstract description 187
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 176
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 173
- 238000001514 detection method Methods 0.000 claims abstract description 155
- 238000005259 measurement Methods 0.000 claims abstract description 31
- 238000004448 titration Methods 0.000 claims abstract description 28
- 230000002572 peristaltic effect Effects 0.000 claims description 190
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 70
- 238000004140 cleaning Methods 0.000 claims description 69
- 238000002835 absorbance Methods 0.000 claims description 58
- 238000002347 injection Methods 0.000 claims description 44
- 239000007924 injection Substances 0.000 claims description 44
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 32
- 229910002651 NO3 Inorganic materials 0.000 claims description 29
- 238000011161 development Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000011481 absorbance measurement Methods 0.000 claims description 17
- 229910052724 xenon Inorganic materials 0.000 claims description 17
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 17
- 239000002699 waste material Substances 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 239000010453 quartz Substances 0.000 claims description 11
- 239000013307 optical fiber Substances 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 238000003556 assay Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 6
- 239000011229 interlayer Substances 0.000 claims description 5
- 239000010410 layer Substances 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 4
- 230000005587 bubbling Effects 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 238000012864 cross contamination Methods 0.000 abstract description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 239000012086 standard solution Substances 0.000 description 14
- 238000005406 washing Methods 0.000 description 14
- -1 permanganate index Chemical compound 0.000 description 9
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 8
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 229960005070 ascorbic acid Drugs 0.000 description 4
- 230000033116 oxidation-reduction process Effects 0.000 description 4
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 4
- 235000010323 ascorbic acid Nutrition 0.000 description 3
- 239000011668 ascorbic acid Substances 0.000 description 3
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 3
- 239000012286 potassium permanganate Substances 0.000 description 3
- 229960004889 salicylic acid Drugs 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 description 2
- 239000011609 ammonium molybdate Substances 0.000 description 2
- 229940010552 ammonium molybdate Drugs 0.000 description 2
- 235000018660 ammonium molybdate Nutrition 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 2
- 239000004323 potassium nitrate Substances 0.000 description 2
- 235000010333 potassium nitrate Nutrition 0.000 description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- ZNCPFRVNHGOPAG-UHFFFAOYSA-L sodium oxalate Chemical compound [Na+].[Na+].[O-]C(=O)C([O-])=O ZNCPFRVNHGOPAG-UHFFFAOYSA-L 0.000 description 2
- 229940039790 sodium oxalate Drugs 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000002211 L-ascorbic acid Substances 0.000 description 1
- 235000000069 L-ascorbic acid Nutrition 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- CVTZKFWZDBJAHE-UHFFFAOYSA-N [N].N Chemical compound [N].N CVTZKFWZDBJAHE-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000007853 buffer solution Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- FEWJPZIEWOKRBE-LWMBPPNESA-N levotartaric acid Chemical compound OC(=O)[C@@H](O)[C@H](O)C(O)=O FEWJPZIEWOKRBE-LWMBPPNESA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910000371 mercury(I) sulfate Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- IWZKICVEHNUQTL-UHFFFAOYSA-M potassium hydrogen phthalate Chemical compound [K+].OC(=O)C1=CC=CC=C1C([O-])=O IWZKICVEHNUQTL-UHFFFAOYSA-M 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical class [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XPFJYKARVSSRHE-UHFFFAOYSA-K trisodium;2-hydroxypropane-1,2,3-tricarboxylate;2-hydroxypropane-1,2,3-tricarboxylic acid Chemical compound [Na+].[Na+].[Na+].OC(=O)CC(O)(C(O)=O)CC(O)=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O XPFJYKARVSSRHE-UHFFFAOYSA-K 0.000 description 1
Landscapes
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses a water quality parameter monitor and a monitoring method, which belong to the technical field of water quality monitoring, wherein the water quality parameter monitor comprises: the system comprises a first reagent metering assembly, a second reagent metering assembly, a digestion assembly, a reaction assembly, a digestion titration assembly and a colorimetric measurement assembly; the first reagent metering assembly includes a first reservoir ring connecting the first multi-channel valve and the first syringe pump; the second reagent metering assembly includes a second reservoir ring connecting the second multi-channel valve and the second syringe pump; the digestion component comprises a total phosphorus digestion pipe and a total nitrogen digestion pipe; the reaction assembly comprises a reaction tank; the digestion titration assembly comprises a digestion tank; the colorimetric measurement assembly comprises a cuvette; the liquid outlet of the first multichannel valve is respectively connected with the total nitrogen digestion pipe and the reaction tank; and the liquid outlet of the second multichannel valve is respectively connected with the total phosphorus digestion pipe, the reaction tank and the digestion tank. The water quality parameter monitor provided by the invention can ensure the metering accuracy of the detection reagent, avoid the cross contamination of the detection reagent and realize the simultaneous measurement of multiple parameters.
Description
Technical Field
The invention relates to a water quality parameter monitor and a monitoring method, and belongs to the technical field of water quality monitoring.
Background
Ammonia nitrogen, total phosphorus and permanganate index are important parameters reflecting the water quality conditions, and in some cases, the content of nitrate and COD in water needs to be measured. In the technical field of water quality monitoring, automatic monitoring instruments are widely used gradually to replace manual monitoring.
On the one hand, the common automatic water quality monitor is a single-parameter monitor, each device can only measure one parameter, and if the parameters such as ammonia nitrogen, total phosphorus, permanganate index and the like are to be measured simultaneously, a plurality of different devices are to be configured simultaneously, so that the device cost is high, and the later maintenance cost is high. At present, no automatic monitor capable of simultaneously measuring parameters such as ammonia nitrogen, total phosphorus, permanganate index and the like based on a chemical method exists.
On the other hand, the volume of the detection reagent can affect the measurement accuracy, in particular the permanganate index, which is closely related to the metering accuracy of the detection reagent. Some monitors measure the volume of the detection reagent by adopting a method of combining a multi-channel valve and a syringe pump, but cannot effectively solve the problem of cross contamination of the detection reagent. For example: the total phosphorus detection reagent contains high-concentration ascorbic acid, potassium permanganate in the permanganate index detection reagent can perform oxidation-reduction reaction with the ascorbic acid, even a small amount of ascorbic acid is not cleaned, the measured value of the permanganate index can be higher, and when interference is serious, the potassium permanganate in the digestion liquid can be completely reduced in the digestion stage; also for example: salicylic acid in the ammonia nitrogen detection reagent is strongly absorbed at 220nm and 275nm, and if salicylic acid in a pipeline is not cleaned, the measurement value of total nitrogen is abnormal.
In addition, the total nitrogen digestion and the total phosphorus digestion are required to be carried out under high-temperature and high-pressure conditions, so that the digestion time is long, the power consumption is high, and potential safety hazards exist.
Disclosure of Invention
The invention aims to provide a water quality parameter monitor and a monitoring method, which can ensure the metering accuracy of detection reagents, avoid cross contamination of the detection reagents and realize simultaneous measurement of multiple parameters.
In order to achieve the above purpose, the present invention provides the following technical solutions:
in a first aspect, the present invention provides a water quality parameter monitor comprising: the system comprises a first reagent metering assembly, a second reagent metering assembly, a digestion assembly, a reaction assembly, a digestion titration assembly and a colorimetric measurement assembly; the first reagent metering assembly includes a first multi-channel valve, a first syringe pump, and a first reservoir ring connecting the first multi-channel valve and the first syringe pump; the second reagent metering assembly includes a second multi-channel valve, a second syringe pump, and a second reservoir ring connecting the second multi-channel valve and the second syringe pump; the digestion component comprises a total phosphorus digestion pipe and a total nitrogen digestion pipe; the reaction assembly comprises a reaction tank; the digestion titration assembly comprises a digestion tank; the colorimetric measurement assembly comprises a cuvette; the liquid outlet of the first multichannel valve is respectively connected with the total nitrogen digestion pipe and the reaction tank; the liquid outlet of the second multi-channel valve is respectively connected with the total phosphorus digestion pipe, the reaction tank and the digestion tank;
Further comprises: a first peristaltic pump for bubbling air into the total phosphorus digestion tube and the total nitrogen digestion tube; the second peristaltic pump is used for injecting the water sample to be detected into the total phosphorus digestion tube, the total nitrogen digestion tube, the reaction tank and the digestion tank; a third peristaltic pump for injecting cleaning water into the total phosphorus digestion pipe, the total nitrogen digestion pipe, the reaction tank and the digestion tank; a fourth peristaltic pump for pumping the liquid in the total phosphorus digestion tube to the reaction tank and pumping the liquid in the reaction tank to the colorimetric tank; a sixth peristaltic pump for pumping the liquid in the total nitrogen digestion tube to the reaction tank and pumping the liquid in the reaction tank to the colorimetric tank; a fifth peristaltic pump for draining liquid from the digestion tank;
wherein, each multichannel valve, each syringe pump and each peristaltic pump all are connected with the control terminal electricity, feedback signal and control by the control terminal to the control terminal.
With reference to the first aspect, further, the first injection pump is connected with a second electromagnetic pinch valve through a second Y-shaped three-way joint, a channel II of the second electromagnetic pinch valve is connected with outside air, a channel I is connected with one end of the first liquid storage ring, and the other end of the first liquid storage ring is connected with the first multi-channel valve; the liquid outlet of the first multi-channel valve is connected with a first electromagnetic pinch valve through a first Y-shaped three-way joint, a channel I of the first electromagnetic pinch valve is connected with the reaction tank, and a channel II is connected with the total nitrogen digestion pipe;
The second injection pump is connected with a sixth electromagnetic pinch valve through a sixth Y-shaped three-way joint, a channel II of the sixth electromagnetic pinch valve is connected with outside air, the channel I is connected with one end of the second liquid storage ring, and the other end of the second liquid storage ring is connected with the second multi-channel valve; the liquid outlet of the second multi-channel valve is connected with a fourth electromagnetic pinch valve through a fourth Y-shaped three-way joint, a channel I of the fourth electromagnetic pinch valve is connected with the digestion tank, a channel II is connected with a fifth electromagnetic pinch valve through a fifth Y-shaped three-way joint, a channel I of the fifth electromagnetic pinch valve is connected with the reaction tank, and a channel II is connected with the total phosphorus digestion pipe;
each electromagnetic pinch valve is electrically connected with the control terminal, and feeds back signals to the control terminal and is controlled by the control terminal.
With reference to the first aspect, further, one end of the first peristaltic pump is connected with external air, and the other end of the first peristaltic pump is respectively connected with the total phosphorus digestion pipe and the total nitrogen digestion pipe through a ninth Y-shaped three-way joint;
one end of the second peristaltic pump is connected with a water sample to be detected, one end of the third peristaltic pump is connected with cleaning water, the other end of the second peristaltic pump and the other end of the third peristaltic pump are connected with a fourteenth Y-shaped three-way joint through a thirteenth Y-shaped three-way joint, the fourteenth Y-shaped three-way joint is connected with a seventh electromagnetic pinch valve, a channel I of the seventh electromagnetic pinch valve is connected with a ninth electromagnetic pinch valve through a fifteenth Y-shaped three-way joint, a channel II is connected with an eighth electromagnetic pinch valve through a twelfth Y-shaped three-way joint, a channel I of the ninth electromagnetic pinch valve is connected with the total nitrogen digestion pipe, a channel II is connected with the total phosphorus digestion pipe, a channel I of the eighth electromagnetic pinch valve is connected with the reaction tank, and a channel II is connected with the digestion tank;
One end of the fourth peristaltic pump is connected with the reaction tank, the other end of the fourth peristaltic pump is connected with a tenth electromagnetic pinch valve through a sixteenth Y-shaped three-way joint, a channel I of the tenth electromagnetic pinch valve is connected with the colorimetric tank, and a channel II is connected with the total phosphorus digestion tube;
one end of the sixth peristaltic pump is connected with the reaction tank, the other end of the sixth peristaltic pump is connected with an eleventh electromagnetic pinch valve through a seventeenth Y-shaped three-way joint, a channel I of the eleventh electromagnetic pinch valve is connected with the total nitrogen digestion pipe, and a channel II of the eleventh electromagnetic pinch valve is connected with the colorimetric tank;
one end of the fifth peristaltic pump is connected with the digestion tank, the other end of the fifth peristaltic pump is connected with a twelfth electromagnetic pinch valve through an eighteenth Y-shaped three-way joint, a channel I of the twelfth electromagnetic pinch valve is connected with a cleaning water discharge channel, and a channel II is connected with a waste liquid discharge channel;
wherein, each electromagnetic pinch valve is connected with the control terminal electricity, feeds back the signal to the control terminal and is controlled by the control terminal.
With reference to the first aspect, the digestion component further includes a digestion tube with a double-layer hollow sandwich structure, a first temperature sensor attached to the outer wall of the digestion tube, a first heating device wrapped on the outer wall of the digestion tube, an ultraviolet lamp tube inserted into the cavity of the inner layer of the digestion tube, and a protective cover covered outside the digestion tube; the hollow interlayer of the digestion tube is divided into a total phosphorus digestion tube and a total nitrogen digestion tube which are not communicated with each other, the total phosphorus digestion tube is provided with a total phosphorus sample inlet and a total phosphorus overflow port, and the total nitrogen digestion tube is provided with a total nitrogen sample inlet and a total nitrogen overflow port;
The first temperature sensor, the first heating device and the ultraviolet lamp tube are all electrically connected with the control terminal, and feedback signals to the control terminal and are controlled by the control terminal.
With reference to the first aspect, the reaction assembly further includes a first motor disposed outside the reaction tank, a first magnet fixedly disposed on the first motor, a first magnet disposed in the reaction tank and corresponding to the first magnet, and a second heating device and a second temperature sensor disposed in the reaction tank; the reaction tank is provided with a sample inlet and an overflow port;
the first motor, the second heating device and the second temperature sensor are all electrically connected with the control terminal, and feedback signals to the control terminal and are controlled by the control terminal.
With reference to the first aspect, the digestion titration assembly further includes a second motor disposed outside the digestion tank, a second magnet fixedly disposed on the second motor, a second magnet disposed in the digestion tank and corresponding to the second magnet, a third heating device and a quartz tube disposed in the digestion tank, wherein a third temperature sensor is disposed in the quartz tube, and a heat conducting silica gel for protecting the third temperature sensor is filled in the quartz tube; the digestion titration assembly further comprises an indication electrode and a reference electrode, wherein one end of the indication electrode is inserted into the digestion tank, one end of the reference electrode is inserted into a liquid storage tank, the liquid storage tank is connected with one end of a salt bridge through a hose, and the other end of the salt bridge is inserted into the digestion tank; the digestion tank is provided with a sample inlet and an overflow port;
The second motor, the third heating device, the third temperature sensor, the indicating electrode and the reference electrode are all electrically connected with the control terminal, and feedback signals to the control terminal and controlled by the control terminal.
With reference to the first aspect, the colorimetric measurement assembly further comprises an opaque housing arranged outside the cuvette, a scintillation xenon lamp connected to one side of the opaque housing through a first optical fiber, and a micro spectrometer connected to the other side of the opaque housing through a second optical fiber; the colorimetric pool is provided with a sample inlet and an overflow port;
the flash xenon lamp and the micro spectrometer are electrically connected with the control terminal, and the flash xenon lamp and the micro spectrometer feed back signals to the control terminal and are controlled by the control terminal.
With reference to the first aspect, further, the first multi-channel valve is a ten-channel valve, where channel a is a liquid outlet, channel b is a cleaning water outlet, channel c is a liquid outlet, channel d is a first ammonia nitrogen detection reagent, channel e is a second ammonia nitrogen detection reagent, channel f is a first total nitrogen detection reagent, channel g is a second total nitrogen detection reagent, and channels h, i and j are standby channels;
the second multi-channel valve is a ten-channel valve, wherein a channel a is a liquid outlet, a channel b is a cleaning water gap, a channel c is a liquid outlet, a channel d is a first total phosphorus detection reagent, a channel e is a second total phosphorus detection reagent, a channel f is a third total phosphorus detection reagent, a channel g is a first permanganate index detection reagent, a channel h is a second permanganate index detection reagent, a channel i is a third permanganate index detection reagent, and a channel j is a standby channel.
In a second aspect, the present invention provides a water quality parameter monitoring method of the water quality parameter monitor according to any one of the first aspects, comprising:
the control terminal controls the second peristaltic pump to inject quantitative water sample to be measured into the total phosphorus digestion pipe, the total nitrogen digestion pipe, the reaction tank and the digestion tank, controls the fourth peristaltic pump to pump the water sample to be measured in the total phosphorus digestion pipe to the reaction tank, controls the sixth peristaltic pump to pump the water sample to be measured in the total nitrogen digestion pipe to the reaction tank, and controls the fifth peristaltic pump to empty the water sample to be measured in the digestion tank;
controlling a fourth peristaltic pump or a sixth peristaltic pump to pump the water sample to be detected in the reaction tank to a colorimetric tank for absorbance measurement, obtaining nitrate absorbance and CODuv absorbance, obtaining the content of nitrate and CODuv in the water sample to be detected according to the nitrate absorbance and the CODuv absorbance, and evacuating the water sample to be detected in the colorimetric tank;
controlling a second peristaltic pump to inject a quantitative water sample to be detected into the reaction tank, and controlling a first multichannel valve and a first injection pump to inject a quantitative first ammonia nitrogen detection reagent and a quantitative second ammonia nitrogen detection reagent into the reaction tank to perform ammonia nitrogen reaction;
controlling a second peristaltic pump to inject a quantitative water sample to be detected into the total nitrogen digestion pipe, and controlling a first multichannel valve and a first injection pump to inject a quantitative first total nitrogen detection reagent and a quantitative second total nitrogen detection reagent into the total nitrogen digestion pipe to perform total nitrogen digestion;
Controlling a second peristaltic pump to inject a quantitative water sample to be detected into the total phosphorus digestion tube, and controlling a second multichannel valve and a second injection pump to inject a quantitative first total phosphorus detection reagent into the total phosphorus digestion tube to perform total phosphorus digestion;
controlling a second peristaltic pump to inject a quantitative water sample to be detected into the digestion tank, and controlling a second multi-channel valve and a second injection pump to inject a quantitative first permanganate index detection reagent and a quantitative third permanganate index detection reagent into the digestion tank to perform permanganate index digestion;
after the ammonia nitrogen reaction in the reaction tank is completed, controlling a fourth peristaltic pump or a sixth peristaltic pump to pump the ammonia nitrogen color development liquid in the reaction tank to the colorimetric tank for absorbance measurement, obtaining ammonia nitrogen absorbance, obtaining the ammonia nitrogen content in the water sample to be detected according to the ammonia nitrogen absorbance, and evacuating the ammonia nitrogen color development liquid in the colorimetric tank;
controlling a third peristaltic pump to inject quantitative cleaning water into the reaction tank, controlling a fourth peristaltic pump or a sixth peristaltic pump to pump the cleaning water in the reaction tank to the colorimetric tank, and evacuating the cleaning water in the colorimetric tank;
when the total nitrogen digestion in the total nitrogen digestion pipe is completed, controlling a sixth peristaltic pump to pump the total nitrogen digestion liquid in the total nitrogen digestion pipe to a reaction tank for cooling, controlling the sixth peristaltic pump to pump the cooled total nitrogen digestion liquid in the reaction tank to a colorimetric tank for absorbance measurement, obtaining total nitrogen absorbance, obtaining the total nitrogen content in the water sample to be measured according to the total nitrogen absorbance, and evacuating the total nitrogen digestion liquid in the colorimetric tank;
Controlling a third peristaltic pump to inject quantitative cleaning water into the total nitrogen digestion pipe, controlling a sixth peristaltic pump to pump the cleaning water in the total nitrogen digestion pipe to the reaction tank, controlling the sixth peristaltic pump to pump the cleaning water in the reaction tank to the colorimetric tank, and evacuating the cleaning water in the colorimetric tank;
when the total phosphorus digestion in the total phosphorus digestion tube is completed, controlling a fourth peristaltic pump to pump the total phosphorus digestion liquid in the total phosphorus digestion tube to a reaction tank for cooling, and controlling the fourth peristaltic pump to pump the quantitatively cooled total phosphorus digestion liquid in the reaction tank to a colorimetric tank for absorbance measurement to obtain background absorbance;
controlling a second multi-channel valve and a second injection pump to inject a quantitative second total phosphorus detection reagent and a quantitative third total phosphorus detection reagent into the reaction tank, and carrying out a total phosphorus color reaction with the residual total phosphorus digestion solution in the reaction tank;
after the color development reaction of the total phosphorus in the reaction tank is completed, controlling a fourth peristaltic pump to pump the color development liquid of the total phosphorus in the reaction tank to a colorimetric tank for absorbance measurement, obtaining absorbance of the color development liquid, obtaining absorbance of the total phosphorus according to absorbance of the background and absorbance of the color development liquid, obtaining the content of the total phosphorus in a water sample to be detected according to absorbance of the total phosphorus, and emptying the color development liquid of the total phosphorus in the colorimetric tank;
controlling a third peristaltic pump to inject quantitative cleaning water into the total phosphorus digestion tube, controlling a fourth peristaltic pump to pump the cleaning water in the total phosphorus digestion tube to the reaction tank, controlling the fourth peristaltic pump to pump the cleaning water in the reaction tank to the colorimetric tank, and evacuating the cleaning water in the colorimetric tank;
After the permanganate index digestion in the digestion tank is completed, controlling a second multi-channel valve and a second injection pump to inject a quantitative second permanganate index detection reagent into the digestion tank, controlling the second multi-channel valve and the second injection pump to instill a third permanganate index detection reagent into the digestion tank one by one until reaching a preset stop condition, calculating and obtaining the content of the permanganate index in the water sample to be measured, and controlling a fifth peristaltic pump to empty the liquid in the digestion tank;
controlling a third peristaltic pump to inject quantitative cleaning water into the digestion tank, and controlling a fifth peristaltic pump to empty liquid in the digestion tank;
and when the temperature in the total phosphorus digestion tube and the total nitrogen digestion tube reaches a preset temperature threshold value in the total phosphorus digestion process and the total nitrogen digestion process, controlling the first peristaltic pump to blow air into the total phosphorus digestion tube and the total nitrogen digestion tube.
With reference to the second aspect, further, calculating and obtaining the content of permanganate index in the water sample to be measured includes:
according to the rotation number of the stepping motor in the second injection pump, calculating to obtain the volume of the third permanganate index detection reagent instilled into the orientation digestion tank;
according to the volume of the third permanganate index detection reagent instilled into the digestion tank, calculating and obtaining the content of the permanganate index in the water sample to be detected;
The calculation formula of the content of permanganate index in the water sample to be measured is as follows:
；
wherein,for the content of permanganate index in the water sample to be tested, < >>To instill the volume of the third permanganate index detection reagent into the digestion tank>Titration of the volume of spent third permanganate index assay reagent for blank permanganate index assay, +.>The concentration of the reagent is detected for the second permanganate index.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the water quality parameter monitor, the liquid storage ring is introduced, the multichannel valve and the injection pump are matched, the detection reagent is pumped to the liquid storage ring for temporary storage, the detection reagent does not enter the injection pump any more, cross contamination of the detection reagent can be avoided, and the service life of the injection pump is prolonged. By first reagent metering component, second reagent metering component, clear up the subassembly, reaction unit, clear up titration subassembly, colorimetric measurement subassembly and each peristaltic pump mutually support, can realize that ammonia nitrogen, total phosphorus, permanganate index, nitrate and CODuv measure simultaneously, and each other do not influence, the third peristaltic pump can in time pour into the washing water into each subassembly into, in time empty the waste liquid with other corresponding peristaltic pumps of cooperation, avoid detect reagent cross contamination, improve measurement accuracy.
(2) The hollow interlayer of the digestion tube is divided into a total phosphorus digestion tube and a total nitrogen digestion tube which are not communicated with each other, and the ultraviolet light assisted catalytic oxidation digestion technology is adopted to digest the total phosphorus and the total nitrogen simultaneously, so that the digestion time can be shortened, the digestion temperature and pressure can be reduced, and the safety is improved. In the total phosphorus digestion and total nitrogen digestion processes, air is blown into the total phosphorus digestion pipe and the total nitrogen digestion pipe through the first peristaltic pump, oxygen in the air is converted into ozone under the irradiation of the ultraviolet lamp tube, and various forms of phosphorus and nitrogen in a water sample to be tested can be subjected to complete digestion reaction and converted into phosphate forms of phosphorus and nitrate forms of nitrogen.
(3) The reaction assembly and the motor, the magnet and the magnetons in the digestion titration assembly are mutually matched, so that liquid in the reaction tank and the digestion tank can be stirred, and the water sample to be measured and each detection reagent are promoted to be mixed.
(4) The colorimetric measurement assembly performs full-band scanning analysis on the liquid in the colorimetric pool from ultraviolet light to visible light through the flash xenon lamp and the micro spectrometer, so that the wavelength range is narrow, the absorbance of a plurality of wavelengths can be measured simultaneously, the measurement accuracy is high, and the stability is good.
(5) The electrode pair consisting of the indicating electrode and the reference electrode can collect the voltage of the liquid in the digestion tank in real time, automatically judge the titration end point through presetting the oxidation-reduction potential value, is not influenced by the chromaticity and turbidity of the water sample to be tested, and has strong anti-interference capability.
Drawings
FIG. 1 is a schematic diagram of a water quality parameter monitor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a digestion assembly provided in an embodiment of the invention;
FIG. 3 is a schematic structural view of a reaction module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a digestion titration assembly in accordance with an embodiment of the present invention;
FIG. 5 is a schematic structural view of a colorimetric measurement assembly provided by an embodiment of the present invention;
FIG. 6 is a schematic diagram of a standard curve of nitrate, ammonia nitrogen, total nitrogen, and total phosphorus provided by an embodiment of the present invention;
FIG. 7 is a schematic diagram of a CODuv standard curve provided by an embodiment of the present invention;
in the figure: 1. a first reagent metering assembly; 101. a first multi-channel valve; 102. a first syringe pump; 103. a first liquid storage ring; 2. a second reagent metering assembly; 201. a second multi-channel valve; 202. a second syringe pump; 203. a second liquid storage ring; 3. a digestion assembly; 301. a protective cover; 302. a digestion tube; 303. a first heating device; 304. a first temperature sensor; 305. an ultraviolet lamp tube; 306. a total phosphorus sample inlet; 307. a total phosphorus overflow port; 308. a total nitrogen sample inlet; 309. a total nitrogen overflow port; 4. a reaction assembly; 401. a first motor; 402. a first magnet; 403. a first magnet; 404. a reaction tank; 405. a second heating device; 406. a second temperature sensor; 5. digestion titration assembly; 501. a second motor; 502. a second magnet; 503. a second magnetic element; 504. a digestion pool; 505. a third heating device; 506. a quartz tube; 507. a third temperature sensor; 508. an indication electrode; 509. a salt bridge; 510. a hose; 511. a liquid storage tank; 512. a reference electrode; 6. a colorimetric measurement assembly; 601. flashing xenon lamp; 602. a first optical fiber; 603. a cuvette; 604. a second optical fiber; 605. a micro spectrometer; 701. a first electromagnetic pinch valve; 702. a second electromagnetic pinch valve; 703. a third electromagnetic pinch valve; 704. a fourth electromagnetic pinch valve; 705. a fifth electromagnetic pinch valve; 706. a sixth electromagnetic pinch valve; 707. a seventh electromagnetic pinch valve; 708. an eighth electromagnetic pinch valve; 709. a ninth electromagnetic pinch valve; 710. a tenth electromagnetic pinch valve; 711. an eleventh electromagnetic pinch valve; 712. a twelfth electromagnetic pinch valve; 801. a first Y-shaped three-way joint; 802. a second Y-shaped three-way joint; 803. a third Y-shaped three-way joint; 804. a fourth Y-shaped three-way joint; 805. a fifth Y-shaped three-way joint; 806. a sixth Y-shaped three-way joint; 807. a seventh Y-shaped three-way joint; 808. an eighth Y-shaped three-way joint; 809. a ninth Y-shaped three-way joint; 810. a tenth Y-shaped three-way joint; 811. an eleventh Y-shaped three-way joint; 812. a twelfth Y-shaped three-way joint; 813. thirteenth Y-shaped three-way joint; 814. fourteenth Y-shaped three-way joint; 815. fifteenth Y-shaped three-way joint; 816. sixteenth Y-shaped three-way joint; 817. seventeenth Y-shaped three-way joint; 818. eighteenth Y-shaped three-way joint; 901. a first T-shaped three-way joint; 902. a second T-shaped three-way joint; 903. a third T-shaped three-way joint; 904. a fourth T-shaped three-way joint; 905. a fifth T-tee fitting; 906. a sixth T-tee fitting; 907. a seventh T-tee fitting; 908. an eighth T-way joint; 909. a ninth T-tee fitting; 910. a tenth T-shaped three-way joint; 911. an eleventh T-way tee; 1001. a first one-way valve; 1002. a second one-way valve; 1003. a third one-way valve; 1004. a fourth one-way valve; 1005. a fifth check valve; 1101. a first peristaltic pump; 1102. a second peristaltic pump; 1103. a third peristaltic pump; 1104. a fourth peristaltic pump; 1105. a fifth peristaltic pump; 1106. a sixth peristaltic pump; 12. a washing water discharge passage; 13. a waste liquid discharge channel;
Wherein the first multi-channel valve 101 and the second multi-channel valve 201 each comprise a channel a, a channel b, a channel c, a channel d, a channel e, a channel f, a channel g, a channel h, a channel i and a channel j, and each electromagnetic pinch valve comprises a channel I and a channel II.
Detailed Description
The technical scheme of the present application will be described in further detail with reference to the specific embodiments.
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. The embodiments of the present application and the technical features in the embodiments may be combined with each other without conflict.
Example 1:
the embodiment provides a water quality parameter monitor, as shown in fig. 1, which comprises a first reagent metering assembly 1, a second reagent metering assembly 2, a digestion assembly 3, a reaction assembly 4, a digestion titration assembly 5 and a colorimetric measurement assembly 6; the first reagent metering assembly 1 comprises a first multi-channel valve 101, a first syringe pump 102 and a first reservoir ring 103 connecting the first multi-channel valve 101 and the first syringe pump 102; the second reagent metering assembly 2 comprises a second multi-channel valve 201, a second syringe pump 202, and a second reservoir ring 203 connecting the second multi-channel valve 201 and the second syringe pump 202; the digestion component 3 comprises a total phosphorus digestion pipe and a total nitrogen digestion pipe; the reaction assembly 4 includes a reaction cell 404; digestion titration assembly 5 includes a digestion tank 504; the colorimetric measurement assembly 6 comprises a cuvette 603; the liquid outlet of the first multi-channel valve 101 is respectively connected with a total nitrogen digestion pipe and a reaction tank 404; the liquid outlet of the second multi-channel valve 201 is respectively connected with a total phosphorus digestion pipe, a reaction tank 404 and a digestion tank 504; further comprises: a first peristaltic pump 1101 for bubbling air into the total phosphorus digestion tube and the total nitrogen digestion tube; a second peristaltic pump 1102 for injecting water sample to be measured into the total phosphorus digestion tube, the total nitrogen digestion tube, the reaction tank 404 and the digestion tank 504; a third peristaltic pump 1103 for injecting cleaning water into the total phosphorus digestion tube, the total nitrogen digestion tube, the reaction tank 404, and the digestion tank 504; a fourth peristaltic pump 1104 for pumping the liquid in the total phosphorus digestion tube to the reaction tank 404 and the liquid in the reaction tank 404 to the colorimetric tank 603; a sixth peristaltic pump 1106 for pumping the liquid in the total nitrogen digestion tube to the reaction cell 404 and the liquid in the reaction cell 404 to the colorimetric cell 603; a fifth peristaltic pump 1105 for draining liquid from the digestion tank 504; wherein, each multichannel valve, each syringe pump and each peristaltic pump all are connected with the control terminal electricity, feedback signal and control by the control terminal to the control terminal. The material of each liquid storage ring is polytetrafluoroethylene, and the effective volume of each liquid storage ring is greater than the maximum volume of the detection reagent to be metered.
In this embodiment, as shown in fig. 1, the first syringe pump 102 is connected to the second electromagnetic pinch valve 702 through the second Y-shaped three-way joint 802, the channel ii of the second electromagnetic pinch valve 702 is connected to the outside air, the channel i is connected to one end of the first liquid storage ring 103, and the other end of the first liquid storage ring 103 is connected to the first multi-channel valve 101; the liquid outlet of the first multi-channel valve 101 is connected with a first electromagnetic pinch valve 701 through a first Y-shaped three-way joint 801, a channel I of the first electromagnetic pinch valve 701 is connected with a reaction tank 404, and a channel II is connected with a total nitrogen digestion pipe; the second syringe pump 202 is connected with a sixth electromagnetic pinch valve 706 through a sixth Y-shaped three-way joint 806, a channel II of the sixth electromagnetic pinch valve 706 is connected with the outside air, the channel I is connected with one end of the second liquid storage ring 203, and the other end of the second liquid storage ring 203 is connected with the second multi-channel valve 201; the liquid outlet of the second multi-channel valve 201 is connected with a fourth electromagnetic pinch valve 704 through a fourth Y-shaped three-way joint 804, a channel I of the fourth electromagnetic pinch valve 704 is connected with a digestion tank 504, a channel II is connected with a fifth electromagnetic pinch valve 705 through a fifth Y-shaped three-way joint 805, a channel I of the fifth electromagnetic pinch valve 705 is connected with a reaction tank 404, and a channel II is connected with a total phosphorus digestion pipe; each electromagnetic pinch valve is electrically connected with the control terminal, and feeds back signals to the control terminal and is controlled by the control terminal.
In this embodiment, as shown in fig. 1, one end of the first peristaltic pump 1101 is connected to the outside air, and the other end is connected to the total phosphorus digestion tube and the total nitrogen digestion tube through a ninth Y-shaped three-way joint 809, respectively; one end of the second peristaltic pump 1102 is connected with a water sample to be measured, one end of the third peristaltic pump 1103 is connected with cleaning water, the other end of the second peristaltic pump 1102 and the other end of the third peristaltic pump 1103 are connected with a fourteenth Y-shaped three-way joint 814 through a thirteenth Y-shaped three-way joint 813, the fourteenth Y-shaped three-way joint 814 is connected with a seventh electromagnetic pinch valve 707, a channel I of the seventh electromagnetic pinch valve 707 is connected with a ninth electromagnetic pinch valve 709 through a fifteenth Y-shaped three-way joint 815, a channel II is connected with an eighth electromagnetic pinch valve 708 through a twelfth Y-shaped three-way joint 812, a channel I of the ninth electromagnetic pinch valve 709 is connected with a total nitrogen digestion pipe, a channel II is connected with a total phosphorus digestion pipe, a channel I of the eighth electromagnetic pinch valve 708 is connected with a reaction tank 404, and a channel II is connected with a digestion tank 504; one end of the fourth peristaltic pump 1104 is connected with the reaction tank 404, the other end of the fourth peristaltic pump 1104 is connected with the tenth electromagnetic pinch valve 710 through a sixteenth Y-shaped three-way joint 816, a channel I of the tenth electromagnetic pinch valve 710 is connected with the colorimetric tank 603, and a channel II is connected with the total phosphorus digestion tube; one end of the sixth peristaltic pump 1106 is connected with the reaction tank 404, the other end of the sixth peristaltic pump is connected with the eleventh electromagnetic pinch valve 711 through a seventeenth Y-shaped three-way joint 817, a channel I of the eleventh electromagnetic pinch valve 711 is connected with the total nitrogen digestion pipe, and a channel II is connected with the colorimetric tank 603; one end of the fifth peristaltic pump 1105 is connected with the digestion tank 504, the other end is connected with the twelfth electromagnetic pinch valve 712 through an eighteenth Y-shaped three-way joint 818, a channel I of the twelfth electromagnetic pinch valve 712 is connected with the cleaning water discharge channel 12, and a channel II is connected with the waste liquid discharge channel 13; wherein, each electromagnetic pinch valve is connected with the control terminal electricity, feeds back the signal to the control terminal and is controlled by the control terminal.
In this embodiment, as shown in fig. 2, the digestion component 3 includes a digestion tube 302 with a double-layer hollow sandwich structure, a first temperature sensor 304 attached to the outer wall of the digestion tube 302, a first heating device 303 wrapped on the outer wall of the digestion tube 302, an ultraviolet lamp tube 305 inserted into the inner cavity of the digestion tube 302, and a protective cover 301 covering the digestion tube 302; the hollow interlayer of the digestion pipe 302 is divided into a total phosphorus digestion pipe and a total nitrogen digestion pipe which are not communicated with each other, the total phosphorus digestion pipe is provided with a total phosphorus sample inlet 306 and a total phosphorus overflow port 307, the total nitrogen digestion pipe is provided with a total nitrogen sample inlet 308 and a total nitrogen overflow port 309, and the total phosphorus overflow port 307 and the total nitrogen overflow port 309 are connected with the waste liquid discharge channel 13 through a fifth T-shaped three-way joint 905; the first temperature sensor 304, the first heating device 303 and the ultraviolet lamp 305 are all electrically connected with the control terminal, and feedback signals to the control terminal and controlled by the control terminal. The ultraviolet lamp 305 is capable of emitting ultra-short ultraviolet light, typically 185nm. The material of the digestion tube 302 is quartz, and the outer wall of the digestion tube 302 is coated with a light-shielding layer.
In this embodiment, as shown in fig. 3, the reaction assembly 4 further includes a first motor 401 disposed outside the reaction tank 404, a first magnet 402 fixed on the first motor 401, a first magnet 403 disposed in the reaction tank 404 and corresponding to the first magnet 402, and a second heating device 405 and a second temperature sensor 406 disposed in the reaction tank 404; the reaction tank 404 is provided with a sample inlet and an overflow port, and the overflow port of the reaction tank 404 is connected with the waste liquid discharge channel 13; wherein, the first motor 401, the second heating device 405 and the second temperature sensor 406 are all electrically connected with the control terminal, and feedback signals to the control terminal and are controlled by the control terminal.
In this embodiment, as shown in fig. 4, the digestion titration assembly 5 further includes a second motor 501 disposed outside the digestion tank 504, a second magnet 502 fixed on the second motor 501, a second magnet 503 disposed in the digestion tank 504 and corresponding to the second magnet 502, and a third heating device 505 and a quartz tube 506 disposed in the digestion tank 504, wherein a third temperature sensor 507 is disposed in the quartz tube 506, and a heat-conducting silica gel for protecting the third temperature sensor 507 is filled in the quartz tube 506; the digestion titration assembly 5 further comprises an indication electrode 508 and a reference electrode 512, wherein one end of the indication electrode 508 is inserted into the digestion tank 504, one end of the reference electrode 512 is inserted into a liquid storage tank 511, the liquid storage tank 511 is connected with one end of a salt bridge 509 through a hose 510, and the other end of the salt bridge 509 is inserted into the digestion tank 504; the digestion tank 504 is provided with a sample inlet and an overflow port, and the overflow port of the digestion tank 504 is connected with the waste liquid discharge channel 13; wherein, the second motor 501, the third heating device 505, the third temperature sensor 507, the indicating electrode 508 and the reference electrode 512 are all electrically connected with the control terminal, and feedback signals to the control terminal and controlled by the control terminal. The indication electrode 508 is a platinum wire electrode, the reference electrode 512 is a mercury-mercurous sulfate electrode, and the liquid storage tank 511 is a saturated potassium sulfate liquid storage tank. The indicating electrode 508 and the reference electrode 512 form an electrode pair, the voltage of the liquid in the digestion tank 504 is collected in real time, the titration endpoint is automatically judged through a preset oxidation-reduction potential value, and the preset oxidation-reduction potential value is 0.61V.
In this embodiment, as shown in fig. 5, the colorimetric measurement assembly 6 further includes an opaque housing disposed outside the cuvette 603, a scintillation xenon lamp 601 connected to one side of the opaque housing through a first optical fiber 602, and a micro spectrometer 605 connected to the other side of the opaque housing through a second optical fiber 604; the cuvette 603 is provided with a sample inlet and an overflow port, the overflow port of the cuvette 603 is connected with a twelfth electromagnetic pinch valve 712 through an eighteenth Y-shaped three-way joint 818, a channel I of the twelfth electromagnetic pinch valve 712 is connected with a cleaning water discharge channel 12, and a channel II is connected with a waste liquid discharge channel 13; the flash xenon lamp 601 and the micro spectrometer 605 are electrically connected with a control terminal, and feed back signals to the control terminal and control the control terminal. The light emitted by the flash xenon lamp 601 is transmitted to the cuvette 603 through the first optical fiber 602, the light transmitted through the cuvette 603 is transmitted to the micro spectrometer 605 through the second optical fiber 604, the micro spectrometer 605 converts the received light signal into an electric signal and transmits the electric signal to the control terminal, and the control terminal automatically calculates the absorbance of the liquid in the cuvette 603; wherein the micro spectrometer 605 is capable of automatically extracting light of a specific wavelength.
In this embodiment, as shown in fig. 1, one end of the fifth peristaltic pump 1105 is connected to the sample inlet of the digestion tank 504, the other end and the overflow port of the cuvette 603 are respectively connected to the third end and the first end of the tenth T-shaped tee 910, the second end of the tenth T-shaped tee 910 is connected to the twelfth electromagnetic pinch valve 712 through the eighteenth Y-shaped tee 818, the channel i of the twelfth electromagnetic pinch valve 712 is connected to the wash water discharge channel 12, the channel ii is connected to the third end of the seventh T-shaped tee 907, the total phosphorus overflow port 307 and the total nitrogen overflow port 309 are respectively connected to the third end and the first end of the fifth T-shaped tee 905, the overflow port of the reaction tank 404 is connected to the third end of the eighth T-shaped tee 908, the overflow port of the digestion tank 504 is connected to the third end of the ninth T-shaped tee 909, the second end of the fifth T-shaped tee 905 is connected to the first end of the seventh T-shaped tee 907, the second end of the seventh T-shaped tee 907 is connected to the first end of the eighth T-shaped tee 908, the second end of the eighth T-shaped tee 908 is connected to the third end of the eighth T-shaped tee 907, and the third end of the eighth T-shaped tee 908 is connected to the third end of the ninth T-shaped tee 909. The liquid discharged from the washing water discharge passage 12 can be discharged after simple treatment, and the liquid discharged from the waste liquid discharge passage 13 is recovered intensively.
In this embodiment, as shown in fig. 1, a third check valve 1003 for preventing liquid from flowing backward is connected between the total nitrogen overflow port 309 and the first end of the fifth T-shaped three-way joint 905, a fourth check valve 1004 for preventing liquid from flowing backward is connected between the total phosphorus overflow port 307 and the third end of the fifth T-shaped three-way joint 905, a liquid outlet of the third check valve 1003 is connected to the first end of the fifth T-shaped three-way joint 905, a liquid outlet of the fourth check valve 1004 is connected to the third end of the fifth T-shaped three-way joint 905, a liquid inlet of the total nitrogen overflow port 309 and the third check valve 1003 is connected to a first check valve 1001 through the first T-shaped three-way joint 901, and a liquid inlet of the total phosphorus overflow port 307 and the fourth check valve 1004 is connected to a second check valve 1002 through the third T-shaped three-way joint 903.
In this embodiment, as shown in fig. 1, one end of the first peristaltic pump 1101 is connected to the outside air, and the other end is connected to the third end of the ninth Y-shaped three-way connector 809; the channel II of the first electromagnetic pinch valve 701 is connected with the first end of the second T-shaped three-way joint 902, the channel I of the ninth electromagnetic pinch valve 709 and the channel I of the eleventh electromagnetic pinch valve 711 are connected with the second end of the second T-shaped three-way joint 902 through a sixth T-shaped three-way joint 906, and the third end of the second T-shaped three-way joint 902 and the first end of the ninth Y-shaped three-way joint 809 are connected with the total nitrogen injection port 308 through an eighth Y-shaped three-way joint 808; the channel II of the fifth electromagnetic pinch valve 705 and the channel II of the ninth electromagnetic pinch valve 709 are connected to the first end of the eleventh Y-shaped tee 811 through a seventh Y-shaped tee joint 807, the channel II of the tenth electromagnetic pinch valve 710 is connected to the second end of the eleventh Y-shaped tee 811, and the third end of the eleventh Y-shaped tee 811 and the second end of the ninth Y-shaped tee joint 809 are connected to the total phosphorous injection port 306 through a tenth Y-shaped tee joint 810. A fifth check valve 1005 for preventing the reverse flow of the liquid is connected between the second end of the ninth Y-tee joint 809 and the tenth Y-tee joint 810.
In this embodiment, as shown in fig. 1, a fourth peristaltic pump 1104 and a sixth peristaltic pump 1106 are connected to the sample inlet of the reaction tank 404 through a fourth T-shaped three-way joint 904; channel I of tenth electromagnetic pinch valve 710 and channel II of eleventh electromagnetic pinch valve 711 are connected to the sample inlet of cuvette 603 via eleventh T-joint 911.
In this embodiment, as shown in fig. 1, a channel i of the fourth electromagnetic pinch valve 704 is connected to the third electromagnetic pinch valve 703 through a third Y-shaped three-way connector 803, and a channel i and a channel ii of the third electromagnetic pinch valve 703 are respectively connected to the digestion tank 504.
In this embodiment, as shown in fig. 1, the first multi-channel valve 101 is a ten-channel valve, where channel a is a liquid outlet, channel b is a cleaning water gap, channel c is a liquid outlet, channel d is a first ammonia nitrogen detection reagent, channel e is a second ammonia nitrogen detection reagent, channel f is a first total nitrogen detection reagent, channel g is a second total nitrogen detection reagent, and channels h, i and j are standby channels; the second multi-channel valve 201 is a ten-channel valve, in which, channel a is a liquid outlet, channel b is a cleaning water outlet, channel c is a waste liquid outlet, channel d is a first total phosphorus detection reagent, channel e is a second total phosphorus detection reagent, channel f is a third total phosphorus detection reagent, channel g is a first permanganate index detection reagent, channel h is a second permanganate index detection reagent, channel i is a third permanganate index detection reagent, and channel j is a standby channel.
In this embodiment, each detection reagent and its corresponding labeling solution have the following composition:
(1) Ammonia nitrogen detection reagent:
a first ammonia nitrogen detection reagent: 70g/L sodium hydroxide, 98g/L sodium hypochlorite (available chlorine 10%);
and (2) a second ammonia nitrogen detection reagent: 60g/L sodium hydroxide, 70g/L salicylic acid, 80g/L tartaric acid and 10g/L sodium nitrosoferricyanide;
and (3) ammonia nitrogen detection corresponding standard solution: 1000mg/L ammonium chloride.
(2) Total nitrogen detection reagent:
first total nitrogen detection reagent: 40g/L potassium persulfate solution;
second total nitrogen detection reagent: 35g/L boric acid, 20g/L sodium hydroxide;
total nitrogen detection corresponding standard solution: 1000mg/L potassium nitrate.
(3) Total phosphorus detection reagent:
first total phosphorus detection reagent: 40g/L potassium persulfate solution (containing 20%1+1 sulfuric acid (V/V));
second total phosphorus detection reagent: 35g/L ascorbic acid;
third total phosphorus detection reagent: 25g/L ammonium molybdate, 1g/L potassium antimonate, 5g/L sodium hydroxide and 20g/L citric acid (sodium hydroxide and citric acid are added to form a sodium citrate-citric acid buffer solution, so that the ammonium molybdate can be effectively protected, and the validity period can be prolonged);
total phosphorus detection corresponding standard solution: 1000mg/L dipotassium hydrogen phosphate.
(4) Permanganate index detection reagent:
First permanganate index detection reagent: 1+2 sulfuric acid (V/V);
second permanganate index detection reagent: 12.5mmol/L sodium oxalate solution;
third permanganate index detection reagent: 5mmol/L potassium permanganate solution;
permanganate index detection corresponding standard solution: 1000mg/L sodium oxalate.
(5) Nitrate detection corresponding standard solution: 1000mg/L potassium nitrate.
(6) CODuv detection of the corresponding label: 1000mg/L potassium hydrogen phthalate.
In this embodiment, the initial state (i.e., the power-off state) of each electromagnetic pinch valve is set as: the channel I is opened and the channel II is closed, and the power-on state is: channel I is closed and channel II is open.
The water quality parameter monitor that this embodiment provided, introduce the liquid storage ring, cooperation multichannel valve and syringe pump, take out the detection reagent to the liquid storage ring temporary storage, detection reagent no longer gets into the syringe pump, can avoid detection reagent cross contamination, extension syringe pump's life. By first reagent metering component, second reagent metering component, clear up the subassembly, reaction unit, clear up titration subassembly, colorimetric measurement subassembly and each peristaltic pump mutually support, can realize that ammonia nitrogen, total phosphorus, permanganate index, nitrate and CODuv measure simultaneously, and each other do not influence, the third peristaltic pump can in time pour into the washing water into each subassembly into, in time empty the waste liquid with other corresponding peristaltic pumps of cooperation, avoid detect reagent cross contamination, improve measurement accuracy. The hollow interlayer of the digestion tube is divided into a total phosphorus digestion tube and a total nitrogen digestion tube which are not communicated with each other, and the ultraviolet light assisted catalytic oxidation digestion technology is adopted to digest the total phosphorus and the total nitrogen simultaneously, so that the digestion time can be shortened, the digestion temperature and pressure can be reduced, and the safety is improved. In the total phosphorus digestion and total nitrogen digestion processes, air is blown into the total phosphorus digestion pipe and the total nitrogen digestion pipe through the first peristaltic pump, oxygen in the air is converted into ozone under the irradiation of the ultraviolet lamp tube, and various forms of phosphorus and nitrogen in a water sample to be tested can be subjected to complete digestion reaction and converted into phosphate forms of phosphorus and nitrate forms of nitrogen. The reaction assembly and the motor, the magnet and the magnetons in the digestion titration assembly are mutually matched, so that liquid in the reaction tank and the digestion tank can be stirred, and the water sample to be measured and each detection reagent are promoted to be mixed. The colorimetric measurement assembly performs full-band scanning analysis on the liquid in the colorimetric pool from ultraviolet light to visible light through the flash xenon lamp and the micro spectrometer, so that the wavelength range is narrow, the absorbance of a plurality of wavelengths can be measured simultaneously, the measurement accuracy is high, and the stability is good. The electrode pair consisting of the indicating electrode and the reference electrode can collect the voltage of the liquid in the digestion tank in real time, automatically judge the titration end point through presetting the oxidation-reduction potential value, is not influenced by the chromaticity and turbidity of the water sample to be tested, and has strong anti-interference capability.
Example 2:
the embodiment provides a water quality parameter monitoring method suitable for the water quality parameter monitor provided in embodiment 1, which specifically includes the following steps:
step 1: pipeline washing and nitrate and CODuv measurement;
step 1.1: the control terminal controls the second peristaltic pump 1102 to inject quantitative water sample to be measured into the total phosphorus digestion tube, the total nitrogen digestion tube, the reaction tank 404 and the digestion tank 504, controls the fourth peristaltic pump 1104 to pump the water sample to be measured in the total phosphorus digestion tube to the reaction tank 404, controls the sixth peristaltic pump 1106 to pump the water sample to be measured in the total nitrogen digestion tube to the reaction tank 404, and controls the fifth peristaltic pump 1105 to empty the water sample to be measured in the digestion tank 504;
in this embodiment, each electromagnetic pinch valve is in an initial state, that is, channel i of each electromagnetic pinch valve is opened, channel ii is closed, the second peristaltic pump 1102 is controlled to rotate anticlockwise, the water sample to be measured is injected into the total nitrogen digestion tube, the ninth electromagnetic pinch valve 709 is controlled to be electrified, the water sample to be measured is injected into the total phosphorus digestion tube, the seventh electromagnetic pinch valve 707 is controlled to be electrified, the water sample to be measured is injected into the reaction tank 404, the eighth electromagnetic pinch valve 708 is controlled to be electrified, and the water sample to be measured is injected into the digestion tank 504. The tenth electromagnetic pinch valve 710 is controlled to be electrified, the fourth peristaltic pump 1104 is controlled to rotate anticlockwise, the water sample to be measured in the total phosphorus digestion tube is pumped to the reaction tank 404, the sixth peristaltic pump 1106 is controlled to rotate anticlockwise, the water sample to be measured in the total nitrogen digestion tube is pumped to the reaction tank 404, the fifth peristaltic pump 1105 is controlled to rotate clockwise, and the water sample to be measured in the digestion tank 504 is emptied along the cleaning water discharge channel 12.
Step 1.2: and controlling a fourth peristaltic pump 1104 or a sixth peristaltic pump 1106 to pump the water sample to be detected in the reaction tank 404 to the colorimetric tank 603 for absorbance measurement, obtaining nitrate absorbance and CODuv absorbance, obtaining the content of nitrate and CODuv in the water sample to be detected according to the nitrate absorbance and the CODuv absorbance, and evacuating the water sample to be detected in the colorimetric tank 603.
In this embodiment, the fourth peristaltic pump 1104 is controlled to rotate clockwise to pump the water sample to be measured in the reaction tank 404 to the cuvette 603, and the scintillation xenon lamp 601 and the micro spectrometer 605 are controlled to measure the absorbance at wavelengths of 220nm, 254nm, 275nm and 546nm to obtain the absorbance of the water sample to be measured at wavelengths of 220nm, 254nm, 275nm and 546nm、/>、、/>Further obtain nitrate absorbance->And CODuv absorbanceAccording to nitrate absorbance->And pre-acquiring a nitrate standard curve shown in figure 6, calculating and acquiring the content of nitrate in the water sample to be tested, and according to CODuv absorbance +.>And calculating and obtaining the CODuv content in the water sample to be detected according to the pre-obtained CODuv standard curve shown in fig. 7, and emptying the water sample to be detected in the cuvette 603 along the cleaning water discharge channel 12. Wherein 546nm is the light compensation point when measuring CODuv.
Step 2: reacting ammonia nitrogen;
step 2.1: the second peristaltic pump 1102 is controlled to inject a quantitative water sample to be detected into the reaction tank 404, and the first multichannel valve 101 and the first injection pump 102 are controlled to inject a quantitative first ammonia nitrogen detection reagent and a quantitative second ammonia nitrogen detection reagent into the reaction tank 404 to perform ammonia nitrogen reaction.
In this embodiment, the seventh electromagnetic pinch valve 707 is controlled to be electrified, the second peristaltic pump 1102 is controlled to rotate anticlockwise, 10mL of water sample to be detected is pumped to the reaction tank 404, the first multi-channel valve 101 is controlled to be switched to the channel d, the first injection pump 102 is controlled to pump 1mL of first ammonia nitrogen detection reagent to the first liquid storage ring 103, the first multi-channel valve 101 is controlled to be switched to the channel a, the first injection pump 102 is controlled to pump the first ammonia nitrogen detection reagent in the first liquid storage ring 103 to the reaction tank 404, the first multi-channel valve 101 is controlled to be switched to the channel e, the first injection pump 102 is controlled to pump 1mL of second ammonia nitrogen detection reagent to the first liquid storage ring 103, the first motor 401 is controlled to rotate, the first magnet 403 is driven to stir liquid in the reaction tank 404, the first ammonia nitrogen detection reagent and the second ammonia nitrogen detection reagent to be detected are mixed, the second heating device 405 is controlled to be started to heat the first liquid storage ring 103, the second liquid in the second temperature sensor 406 is controlled to pump 1mL of second ammonia nitrogen detection reagent to the first liquid storage ring 103, the temperature of the water sample is controlled to be collected from the reaction tank 404 at the temperature of 15min to the temperature of the reaction tank 404, and the temperature of the water sample in real time reaches to the temperature of 15min.
In this embodiment, after controlling the first syringe pump 102 to inject the detection reagent in the first reservoir ring 103 into the corresponding component, the following steps are added: the second electromagnetic pinch valve 702 is controlled to be electrified, the first injection pump 102 is controlled to pump quantitative air, the second electromagnetic pinch valve 702 is controlled to be powered off, the first injection pump 102 is controlled to blow residual detection reagent in the first liquid storage ring 103 to corresponding components, the first multi-channel valve 101 is controlled to be switched to the channel b, the first injection pump 102 is controlled to pump quantitative cleaning water to the first liquid storage ring 103, the first multi-channel valve 101 is controlled to be switched to the channel c, and the first injection pump 102 is controlled to drain the cleaning water in the first liquid storage ring 103 so as to reduce residual detection reagent in the first liquid storage ring 103. After controlling the second syringe pump 202 to inject the detection reagent in the second reservoir ring 203 into the corresponding assembly, the following steps are added: the sixth electromagnetic pinch valve 706 is controlled to be electrified, the second injection pump 202 is controlled to pump quantitative air, the sixth electromagnetic pinch valve 706 is controlled to be powered off, the second injection pump 202 is controlled to blow residual detection reagent in the second liquid storage ring 203 to corresponding components, the second multi-channel valve 201 is controlled to switch to the channel b, the second injection pump 202 is controlled to pump quantitative cleaning water to the second liquid storage ring 203, the second multi-channel valve 201 is controlled to switch to the channel c, and the second injection pump 202 is controlled to drain cleaning water in the second liquid storage ring 203 so as to reduce residual detection reagent in the second liquid storage ring 203.
Step 3: total nitrogen digestion and total phosphorus digestion;
step 3.1: controlling a second peristaltic pump 1102 to inject a quantitative water sample to be detected into the total nitrogen digestion tube, and controlling a first multichannel valve 101 and a first injection pump 102 to inject a quantitative first total nitrogen detection reagent and a quantitative second total nitrogen detection reagent into the total nitrogen digestion tube to perform total nitrogen digestion;
in this embodiment, the second peristaltic pump 1102 is controlled to rotate anticlockwise, the 15mL of water sample to be measured is pumped to the total nitrogen digestion tube, the first multi-channel valve 101 is controlled to switch to channel f, the first syringe pump 102 is controlled to pump 2mL of first total nitrogen detection reagent to the first liquid storage ring 103, the first multi-channel valve 101 is controlled to switch to channel a, the first electromagnetic pinch valve 701 is controlled to be electrified, the first syringe pump 102 is controlled to pump the first total nitrogen detection reagent in the first liquid storage ring 103 to the total nitrogen digestion tube, the first multi-channel valve 101 is controlled to switch to channel g, the first syringe pump 102 is controlled to pump 2mL of second total nitrogen detection reagent to the first liquid storage ring 103, the first multi-channel valve 101 is controlled to switch to channel a, the first electromagnetic pinch valve 701 is controlled to be electrified, and the first syringe pump 102 is controlled to pump the second total nitrogen detection reagent in the first liquid storage ring 103 to the total nitrogen digestion tube.
Step 3.2: controlling a second peristaltic pump 1102 to inject a quantitative water sample to be detected into the total phosphorus digestion tube, and controlling a second multi-channel valve 201 and a second injection pump 202 to inject a quantitative first total phosphorus detection reagent into the total phosphorus digestion tube to perform total phosphorus digestion;
In the total phosphorus digestion and total nitrogen digestion process, when the temperature in the total phosphorus digestion pipe and the total nitrogen digestion pipe reaches a preset temperature threshold, the first peristaltic pump 1101 is controlled to blow air into the total phosphorus digestion pipe and the total nitrogen digestion pipe.
In this embodiment, the ninth electromagnetic pinch valve 709 is controlled to be electrified, the second peristaltic pump 1102 is controlled to rotate anticlockwise, 15mL of water sample to be measured is pumped to the total phosphorus digestion tube, the second multi-channel valve 201 is controlled to switch to channel d, the second syringe pump 202 is controlled to pump 2mL of first total phosphorus detection reagent to the second liquid storage ring 203, the second multi-channel valve 201 is controlled to switch to channel a, the fourth electromagnetic pinch valve 704 and the fifth electromagnetic pinch valve 705 are controlled to be electrified, the second syringe pump 202 is controlled to inject the first total phosphorus detection reagent in the second liquid storage ring 203 into the total phosphorus digestion tube, the ultraviolet lamp tube 305 is controlled to start irradiation, the first heating device 303 is controlled to start heating, the first temperature sensor 304 is controlled to collect the temperature of the liquid in the digestion tube 302 in real time, when the temperature of the liquid in the digestion tube 302 reaches 85 ℃, the first peristaltic pump 1101 is controlled to rotate anticlockwise, and air is blown into the total phosphorus digestion tube and the total nitrogen digestion tube at a speed of 50 mL/min.
The total nitrogen digestion and total phosphorus digestion are controlled at the digestion temperature of 85-95 ℃ for 10-30 min.
Step 4: digestion of permanganate index;
step 4.1: and controlling a second peristaltic pump 1102 to inject a quantitative water sample to be measured into the digestion tank 504, and controlling a second multi-channel valve 201 and a second syringe pump 202 to inject a quantitative first permanganate index detection reagent and a quantitative third permanganate index detection reagent into the digestion tank 504 to perform permanganate index digestion.
In this embodiment, the seventh electromagnetic pinch valve 707 and the eighth electromagnetic pinch valve 708 are controlled to be electrified, the second peristaltic pump 1102 is controlled to rotate anticlockwise, 30mL of water sample to be measured is injected into the digestion tank 504, the second multi-channel valve 201 is controlled to be switched to the channel i, the second syringe pump 202 is controlled to pump 5mL of third permanganate index detection reagent into the second liquid storage ring 203, the second multi-channel valve 201 is controlled to be switched to the channel a, the second syringe pump 202 is controlled to pump the third permanganate index detection reagent into the digestion tank 504, the second multi-channel valve 201 is controlled to be switched to the channel g, the second syringe pump 202 is controlled to pump 3mL of first permanganate index detection reagent into the second liquid storage ring 203, the third electromagnetic pinch valve 703 is controlled to be electrified, the second syringe pump 202 is controlled to pump 5mL of the third permanganate index detection reagent into the second liquid storage ring 203, the second motor 501 is controlled to be rotated, the second magnetic sub 503 is controlled to stir liquid in the tank 504, the temperature of the water sample to be measured and the first permanganate index detection reagent in the second liquid storage ring 203 is heated, the temperature of the third liquid storage ring 505 is controlled to be heated, and the temperature of the digestion tank is controlled to be heated, the temperature of the digestion device is controlled to be heated from the temperature of the first high temperature sensor 504 is controlled to be at about 90 min, and the temperature of the digestion device is controlled to start to heat the digestion tank, and the digestion device is controlled to heat the temperature of the digestion tank is controlled to heat the temperature of the temperature sensor is controlled to heat the temperature sensor fluid to heat the temperature sensor 504.
Step 5: measuring ammonia nitrogen;
step 5.1: when the ammonia nitrogen reaction in the reaction tank 404 is completed, controlling a fourth peristaltic pump 1104 or a sixth peristaltic pump 1106 to pump the ammonia nitrogen color development liquid in the reaction tank 404 to a colorimetric tank 603 for absorbance measurement, obtaining ammonia nitrogen absorbance, obtaining the ammonia nitrogen content in the water sample to be detected according to the ammonia nitrogen absorbance, and evacuating the ammonia nitrogen color development liquid in the colorimetric tank 603;
in this embodiment, the ammonia nitrogen reaction is completed first, the fourth peristaltic pump 1104 is controlled to rotate clockwise, the ammonia nitrogen chromogenic liquid obtained by the completion of the ammonia nitrogen reaction in the reaction tank 404 is pumped to the colorimetric tank 603, the scintillation xenon lamp 601 and the micro spectrometer 605 are controlled to measure the absorbance, and the absorbance of the ammonia nitrogen is obtainedAccording to ammonia nitrogen absorbance->And the pre-acquired ammonia nitrogen standard curve shown in fig. 6, calculating and acquiring the ammonia nitrogen content in the water sample to be detected, controlling the twelfth electromagnetic pinch valve 712 to be electrified, and emptying the liquid in the cuvette 603 along the waste liquid discharge channel 13.
Step 5.2: the third peristaltic pump 1103 is controlled to inject quantitative washing water into the reaction tank 404, and the fourth peristaltic pump 1104 or the sixth peristaltic pump 1106 is controlled to pump the washing water in the reaction tank 404 to the cuvette 603, so that the washing water in the cuvette 603 is emptied.
In this embodiment, the seventh electromagnetic pinch valve 707 is controlled to be electrified, the third peristaltic pump 1103 is controlled to rotate anticlockwise, the quantitative washing water is pumped to the reaction tank 404, the first motor 401 is controlled to rotate, the first magnet 403 is driven to stir the washing water in the reaction tank 404, the fourth peristaltic pump 1104 is controlled to rotate clockwise, the washing water in the reaction tank 404 is pumped to the colorimetric tank 603, and the washing water in the colorimetric tank 603 is emptied along the washing water discharge channel 12.
Step 6: total nitrogen measurement;
step 6.1: when the total nitrogen digestion in the total nitrogen digestion pipe is completed, controlling a sixth peristaltic pump 1106 to pump the total nitrogen digestion liquid in the total nitrogen digestion pipe to the reaction tank 404 for cooling, controlling the sixth peristaltic pump 1106 to pump the total nitrogen digestion liquid cooled in the reaction tank 404 to the colorimetric tank 603 for absorbance measurement, obtaining total nitrogen absorbance, obtaining the content of total nitrogen in the water sample to be measured according to the total nitrogen absorbance, and evacuating the total nitrogen digestion liquid in the colorimetric tank 603;
in this embodiment, the total nitrogen digestion and the total phosphorus digestion are completed simultaneously, the sixth peristaltic pump 1106 is controlled to rotate anticlockwise, the total nitrogen digestion solution in the total nitrogen digestion tube is pumped to the reaction tank 404 for cooling, the eleventh electromagnetic pinch valve 711 is controlled to be electrified, the sixth peristaltic pump 1106 is controlled to rotate clockwise, the total nitrogen digestion solution cooled in the reaction tank 404 is pumped to the colorimetric tank 603, the scintillation xenon lamp 601 and the micro spectrometer 605 are controlled to measure absorbance at 220nm and 275nm wavelengths respectively, and absorbance of the total nitrogen digestion solution at 220nm and 275nm wavelengths is obtained、/>Obtaining total nitrogen absorbance->According to total nitrogen absorptionLuminosity->And the pre-acquired total nitrogen standard curve shown in fig. 6, calculating and acquiring the total nitrogen content in the water sample to be detected, controlling the twelfth electromagnetic pinch valve 712 to be electrified, and draining the liquid in the cuvette 603 along the waste liquid discharge channel 13.
Step 6.2: the third peristaltic pump 1103 is controlled to inject quantitative cleaning water into the total nitrogen digestion pipe, the sixth peristaltic pump 1106 is controlled to pump the cleaning water in the total nitrogen digestion pipe to the reaction tank 404, the sixth peristaltic pump 1106 is controlled to pump the cleaning water in the reaction tank 404 to the cuvette 603, and the cuvette 603 is emptied of the cleaning water.
In this embodiment, the third peristaltic pump 1103 is controlled to rotate anticlockwise to pump the quantitative cleaning water to the total nitrogen digestion tube, the sixth peristaltic pump 1106 is controlled to rotate anticlockwise to pump the cleaning water in the total nitrogen digestion tube to the reaction tank 404, the eleventh electromagnetic pinch valve 711 is controlled to be electrified, the sixth peristaltic pump 1106 is controlled to rotate clockwise to pump the cleaning water in the reaction tank 404 to the cuvette 603, and the cleaning water in the cuvette 603 is emptied along the cleaning water discharge channel 12.
Step 7: total phosphorus measurement;
step 7.1: when the total phosphorus digestion in the total phosphorus digestion tube is completed, controlling a fourth peristaltic pump 1104 to pump the total phosphorus digestion liquid in the total phosphorus digestion tube to the reaction tank 404 for cooling, and controlling the fourth peristaltic pump 1104 to pump the quantitatively cooled total phosphorus digestion liquid in the reaction tank 404 to the colorimetric tank 603 for absorbance measurement to obtain background absorbance;
in this embodiment, the tenth electromagnetic pinch valve 710 is controlled to be electrified, the fourth peristaltic pump 1104 is controlled to rotate anticlockwise, the total phosphorus digestion solution in the total phosphorus digestion tube is pumped to the reaction tank 404 for cooling, the tenth electromagnetic pinch valve 710 is controlled to be powered off, the fourth peristaltic pump 1104 is controlled to rotate clockwise, the total phosphorus digestion solution quantitatively cooled in the reaction tank 404 is pumped to the colorimetric tank 603, the scintillation xenon lamp 601 and the micro spectrometer 605 are controlled to perform absorbance measurement, and background absorbance is obtained 。
Step 7.2: controlling the second multi-channel valve 201 and the second injection pump 202 to inject a quantitative second total phosphorus detection reagent and a quantitative third total phosphorus detection reagent into the reaction tank 404, and performing a total phosphorus color reaction with the residual total phosphorus digestion solution in the reaction tank 404;
in this embodiment, the second multi-channel valve 201 is controlled to switch to channel e, the second syringe pump 202 is controlled to pump a quantitative second total phosphorus detection reagent to the second liquid storage ring 203, the second multi-channel valve 201 is controlled to switch to channel a, the fourth electromagnetic pinch valve 704 is controlled to be electrified, the second syringe pump 202 is controlled to pump a second total phosphorus detection reagent in the second liquid storage ring 203 to the reaction tank 404, the second multi-channel valve 201 is controlled to switch to channel f, the second syringe pump 202 is controlled to pump a quantitative third total phosphorus detection reagent to the second liquid storage ring 203, the second multi-channel valve 201 is controlled to switch to channel a, the fourth electromagnetic pinch valve 704 is controlled to be electrified, the second syringe pump 202 is controlled to pump a third total phosphorus detection reagent in the second liquid storage ring 203 to the reaction tank 404, the first motor 401 is controlled to rotate, and the first magnet 403 is driven to stir the residual first total phosphorus detection reagent, the second total phosphorus detection reagent and the third total phosphorus detection reagent in the reaction tank 404 for 4-10 min.
Step 7.3: when the color development reaction of the total phosphorus in the reaction tank 404 is completed, controlling a fourth peristaltic pump 1104 to pump the color development liquid of the total phosphorus in the reaction tank 404 to a colorimetric tank 603 for absorbance measurement, obtaining absorbance of the color development liquid, obtaining absorbance of the total phosphorus according to absorbance of the background and absorbance of the color development liquid, obtaining the content of the total phosphorus in a water sample to be detected according to absorbance of the total phosphorus, and evacuating the color development liquid of the total phosphorus in the colorimetric tank 603;
in this embodiment, the fourth peristaltic pump 1104 is controlled to rotate clockwise, the total phosphorus color development liquid obtained by the completion of the total phosphorus color development reaction in the reaction tank 404 is pumped to the colorimetric tank 603, the scintillation xenon lamp 601 and the micro spectrometer 605 are controlled, absorbance measurement is performed at a wavelength of 710nm, and absorbance of the color development liquid is obtainedAccording to background absorbance->And developing solution absorbance->Obtaining total phosphorus absorbance->According to total phosphorus absorbance->And the pre-obtained total phosphorus standard curve shown in fig. 6, calculating and obtaining the total phosphorus content in the water sample to be detected, controlling the twelfth electromagnetic pinch valve 712 to be electrified, and emptying the liquid in the cuvette 603 along the waste liquid discharge channel 13. />
Step 7.4: the third peristaltic pump 1103 is controlled to inject quantitative cleaning water into the total phosphorus digestion tube, the fourth peristaltic pump 1104 is controlled to pump the cleaning water in the total phosphorus digestion tube to the reaction tank 404, the fourth peristaltic pump 1104 is controlled to pump the cleaning water in the reaction tank 404 to the colorimetric tank 603, and the colorimetric tank 603 is emptied of the cleaning water.
In this embodiment, the ninth electromagnetic pinch valve 709 is controlled to be electrified, the third peristaltic pump 1103 is controlled to rotate anticlockwise, the quantitative cleaning water is injected into the total phosphorus digestion tube, the tenth electromagnetic pinch valve 710 is controlled to be electrified, the fourth peristaltic pump 1104 is controlled to rotate anticlockwise, the cleaning water in the total phosphorus digestion tube is pumped to the reaction tank 404, the first motor 401 is controlled to rotate, the first magnet 403 is driven to stir the cleaning water in the reaction tank 404, the tenth electromagnetic pinch valve 710 is controlled to be powered off, the fourth peristaltic pump 1104 is controlled to rotate clockwise, the cleaning water in the reaction tank 404 is pumped to the cuvette 603, and the cleaning water in the cuvette 603 is drained along the cleaning water drainage channel 12.
Step 8: permanganate index measurement;
step 8.1: after the permanganate index digestion in the digestion tank 504 is completed, controlling the second multi-channel valve 201 and the second injection pump 202 to inject quantitative second permanganate index detection reagent into the digestion tank 504, controlling the second multi-channel valve 201 and the second injection pump 202 to instill third permanganate index detection reagent into the digestion tank 504 one by one until reaching a preset stop condition, calculating and obtaining the content of the permanganate index in the water sample to be measured, and controlling the fifth peristaltic pump 1105 to empty the liquid in the digestion tank 504;
In this embodiment, after the total phosphorus is measured, the permanganate index digestion is completed, the second multi-channel valve 201 is controlled to switch to channel h, the second syringe pump 202 is controlled to pump 5mL of the second permanganate index detection reagent to the second liquid storage ring 203, the second multi-channel valve 201 is controlled to switch to channel a, the third electromagnetic pinch valve 703 is controlled to be electrified, the second syringe pump 202 is controlled to inject the second permanganate index detection reagent in the second liquid storage ring 203 into the digestion tank 504, at this time, the liquid in the digestion tank 504 is changed from purple to colorless, the second multi-channel valve 201 is controlled to channel i, the second syringe pump 202 is controlled to pump 10mL of the third permanganate index detection reagent to the second liquid storage ring 203, the second multi-channel valve 201 is controlled to switch to channel a, the third electromagnetic pinch valve 703 is controlled to be powered off, the second syringe pump 202 is controlled to instill the third permanganate index detection reagent in the second liquid storage ring 203 into the digestion tank 504, the electrode pair formed by the indicating electrode 508 and the reference electrode 512 is controlled to obtain the voltage of the liquid in the real-time acquisition tank 504 until the preset voltage in the digestion tank 504 reaches the preset voltage value of the first liquid, the second electromagnetic pinch valve 712 is controlled to rotate down until the measured voltage value reaches 13V, the second electromagnetic pinch valve 712 is controlled to rotate down, the measured, and the measured voltage in the digestion tank is controlled to rotate down to obtain the measured voltage, and the measured 13, the measured voltage is controlled to rotate down, and the peristaltic valve is controlled to rotate, and the counter electrode is stopped.
In this embodiment, calculating and obtaining the content of permanganate index in the water sample to be measured specifically includes the following steps:
step (1): calculating the volume of the third permanganate index detection reagent instilled into the obtained orientation resolution cell 504 according to the rotation number of the stepping motor in the second syringe pump 202;
step (2): and according to the volume of the third permanganate index detection reagent instilled into the digestion tank 504, calculating and obtaining the content of the permanganate index in the water sample to be detected.
In this embodiment, the calculation formula of the content of permanganate index in the water sample to be measured is:
；
wherein,for the content of permanganate index in the water sample to be tested, < >>To instill the volume of the third permanganate index detection reagent into the digestion tank 504>Titration of the volume of spent third permanganate index assay reagent for blank permanganate index assay, +.>The concentration of the reagent is detected for the second permanganate index. The water quality parameter monitor provided in example 1 has a calculation formula of the content of permanganate index built therein.
Step 8.2: the third peristaltic pump 1103 is controlled to inject a constant amount of washing water into the digestion tank 504, and the fifth peristaltic pump 1105 is controlled to empty the digestion tank 504 of liquid.
In this embodiment, the seventh electromagnetic pinch valve 707 and the eighth electromagnetic pinch valve 708 are controlled to be electrified, the third peristaltic pump 1103 is controlled to rotate anticlockwise, a fixed amount of cleaning water is injected into the digestion tank 504, the second motor 501 is controlled to rotate, the second magnet 503 is driven to stir the cleaning water in the digestion tank 504, the fifth peristaltic pump 1105 is controlled to rotate clockwise, and the cleaning water in the digestion tank 504 is emptied along the cleaning water discharge channel 12.
Step 9: and (5) evacuating the pipeline.
In this embodiment, the second peristaltic pump 1102 is controlled to rotate clockwise to empty the water sample to be tested in the pipeline connected with the total nitrogen digestion pipe, the ninth electromagnetic pinch valve 709 is controlled to be electrified to empty the water sample to be tested in the pipeline connected with the total phosphorus digestion pipe, the seventh electromagnetic pinch valve 707 is controlled to be electrified to empty the water sample to be tested in the pipeline connected with the reaction tank 404, the eighth electromagnetic pinch valve 708 is controlled to be electrified to empty the water sample to be tested in the pipeline connected with the digestion tank 504.
Before the water quality parameters are monitored by using the steps 1 to 9, ammonia nitrogen, total phosphorus, nitrate and CODuv standard curves are drawn by using the steps 1 to 9, and permanganate index blank detection is carried out.
The method comprises the steps of respectively diluting the standard solution corresponding to the ammonia nitrogen detection reagent, the standard solution corresponding to the total phosphorus detection reagent, the nitrate and the standard solution corresponding to the CODuv into standard solutions with different concentration gradients, wherein after dilution, the concentration of the standard solution corresponding to the CODuv is respectively 0mg/L, 5mg/L, 20mg/L, 50mg/L, 100mg/L, 500mg/L and 1000mg/L, and the concentration of the standard solution corresponding to the ammonia nitrogen detection reagent, the standard solution corresponding to the total phosphorus detection reagent and the standard solution corresponding to the nitrate are respectively 0mg/L, 0.05mg/L, 0.1mg/L, 0.5mg/L, 1mg/L, 2mg/L, 5mg/L and 10mg/L.
And (3) controlling the sample injection amount of each standard solution to be consistent with the sample injection amount of the water sample to be detected, calibrating the water quality parameter monitor provided in the embodiment 1 by utilizing the steps 1 to 9, and drawing a nitrate, ammonia nitrogen, total nitrogen and total phosphorus standard curve shown in fig. 6 and a CODuv standard curve shown in fig. 7.
The permanganate index blank detection adopts distilled water to replace a water sample to be detected, and the volume of a third permanganate index detection reagent consumed by the permanganate index blank detection titration is obtained through automatic titration，/>。
About 65 minutes is required to complete the steps 1 to 9, and the information of the standard curves of nitrate, CODuv, ammonia nitrogen, total phosphorus and total nitrogen is shown in table 1.
TABLE 1 information on standard curves for nitrate, CODuv, ammonia nitrogen, total phosphorus and total nitrogen
In table 1, a is absorbance corresponding to each parameter, and X is concentration corresponding to each parameter. The water quality parameter monitor provided in example 1 is provided with information of standard curves of nitrate, CODuv, ammonia nitrogen, total phosphorus and total nitrogen as shown in table 1.
As can be seen from Table 1, FIG. 6 and FIG. 7, the standard curves of nitrate, CODuv, ammonia nitrogen, total phosphorus and total nitrogen have good linear correlation, and the linear correlation coefficient R 2 All are above 0.998.
And (3) carrying out water quality parameter monitoring by utilizing the steps 1 to 9, collecting a water sample to be detected from a natural river, taking the water sample back to a laboratory, standing for 30min, and then placing the water sample on a water quality parameter monitor provided in the embodiment 1 for carrying out water quality parameter monitoring, wherein the time for ammonia nitrogen reaction in the step 2 is controlled to be 8min, the digestion temperature for total nitrogen digestion and total phosphorus digestion in the step 3 is controlled to be 95 ℃, the digestion time is 15min, and the time for total phosphorus color reaction in the step 7.2 is controlled to be 5min.
After steps 1 to 9 are completed, nitrate absorbance is automatically displayed on a display screen of the water quality parameter monitor provided in embodiment 1CODuv absorbance->Absorbance of ammonia nitrogen->Total nitrogen absorbance->Total phosphorus absorbance->According to the information of the standard curves of nitrate, CODuv, ammonia nitrogen, total phosphorus and total nitrogen built in the water quality parameter monitor provided in the embodiment 1, the nitrate concentration in the water sample to be detected is calculated and obtained +.>CODuv concentration->Ammonia nitrogen concentration->Total nitrogen concentration->Total phosphorus concentration->。
Content of permanganate index in water sample to be measuredThe water quality parameter monitor provided in the embodiment 1 is obtained by automatic calculation according to a calculation formula of the content of the built-in permanganate index.
The results obtained by the water quality parameter monitoring method provided by the embodiment are compared with the results obtained by manual analysis of field sampling, and the comparison results are shown in table 2.
Table 2 results obtained from the Water quality parameter monitoring method are compared with results obtained from the on-site sampling Manual analysis
As can be seen from table 2, the relative error between the result obtained by the water quality parameter monitoring method and the result obtained by the manual analysis of the on-site sampling is within ±8%, which meets the error requirement specified by the relevant standard, and the method can realize simultaneous measurement of multiple parameters with accurate and reliable measurement result.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present application, and such modifications and variations should also be regarded as being within the scope of the present application.
Claims (10)
1. A water quality parameter monitor, comprising: the device comprises a first reagent metering assembly (1), a second reagent metering assembly (2), a digestion assembly (3), a reaction assembly (4), a digestion titration assembly (5) and a colorimetric measurement assembly (6); the first reagent metering assembly (1) comprises a first multi-channel valve (101), a first syringe pump (102) and a first reservoir ring (103) connecting the first multi-channel valve (101) and the first syringe pump (102); the second reagent metering assembly (2) comprises a second multi-channel valve (201), a second syringe pump (202), and a second reservoir ring (203) connecting the second multi-channel valve (201) and the second syringe pump (202); the digestion component (3) comprises a total phosphorus digestion pipe and a total nitrogen digestion pipe; the reaction assembly (4) comprises a reaction tank (404); the digestion titration assembly (5) comprises a digestion tank (504); the colorimetric measurement assembly (6) comprises a cuvette (603); the liquid outlet of the first multi-channel valve (101) is respectively connected with the total nitrogen digestion pipe and the reaction tank (404); the liquid outlet of the second multi-channel valve (201) is respectively connected with the total phosphorus digestion pipe, the reaction tank (404) and the digestion tank (504);
Further comprises: a first peristaltic pump (1101) for bubbling air into the total phosphorus digestion tube and the total nitrogen digestion tube; a second peristaltic pump (1102) for injecting the water sample to be detected into the total phosphorus digestion tube, the total nitrogen digestion tube, the reaction tank (404) and the digestion tank (504); a third peristaltic pump (1103) for injecting cleaning water into the total phosphorus digestion tube, the total nitrogen digestion tube, the reaction tank (404) and the digestion tank (504); a fourth peristaltic pump (1104) for pumping the liquid in the total phosphorus digestion tube to the reaction tank (404) and pumping the liquid in the reaction tank (404) to the colorimetric tank (603); a sixth peristaltic pump (1106) for pumping the liquid in the total nitrogen digestion tube to the reaction cell (404) and the liquid in the reaction cell (404) to the cuvette (603); a fifth peristaltic pump (1105) for draining liquid from the digestion tank (504);
wherein, each multichannel valve, each syringe pump and each peristaltic pump all are connected with the control terminal electricity, feedback signal and control by the control terminal to the control terminal.
2. The water quality parameter monitor according to claim 1, wherein the first injection pump (102) is connected to a second electromagnetic pinch valve (702) through a second Y-shaped three-way joint (802), a channel ii of the second electromagnetic pinch valve (702) is connected to the outside air, a channel i is connected to one end of the first liquid storage ring (103), and the other end of the first liquid storage ring (103) is connected to the first multi-channel valve (101); the liquid outlet of the first multi-channel valve (101) is connected with a first electromagnetic pinch valve (701) through a first Y-shaped three-way joint (801), a channel I of the first electromagnetic pinch valve (701) is connected with the reaction tank (404), and a channel II is connected with the total nitrogen digestion pipe;
The second injection pump (202) is connected with a sixth electromagnetic pinch valve (706) through a sixth Y-shaped three-way joint (806), a channel II of the sixth electromagnetic pinch valve (706) is connected with outside air, a channel I is connected with one end of the second liquid storage ring (203), and the other end of the second liquid storage ring (203) is connected with the second multi-channel valve (201); the liquid outlet of the second multi-channel valve (201) is connected with a fourth electromagnetic pinch valve (704) through a fourth Y-shaped three-way joint (804), a channel I of the fourth electromagnetic pinch valve (704) is connected with the digestion tank (504), a channel II is connected with a fifth electromagnetic pinch valve (705) through a fifth Y-shaped three-way joint (805), a channel I of the fifth electromagnetic pinch valve (705) is connected with the reaction tank (404), and a channel II is connected with the total phosphorus digestion pipe;
each electromagnetic pinch valve is electrically connected with the control terminal, and feeds back signals to the control terminal and is controlled by the control terminal.
3. The water quality parameter monitor according to claim 1, wherein one end of the first peristaltic pump (1101) is connected to the external air, and the other end is respectively connected to the total phosphorus digestion tube and the total nitrogen digestion tube through a ninth Y-shaped three-way joint (809);
One end of the second peristaltic pump (1102) is connected with a water sample to be tested, one end of the third peristaltic pump (1103) is connected with cleaning water, the other end of the second peristaltic pump (1102) and the other end of the third peristaltic pump (1103) are connected with a fourteenth Y-shaped three-way joint (814) through a thirteenth Y-shaped three-way joint (813), the fourteenth Y-shaped three-way joint (814) is connected with a seventh electromagnetic pinch valve (707), a channel I of the seventh electromagnetic pinch valve (707) is connected with a ninth electromagnetic pinch valve (709) through a fifteenth Y-shaped three-way joint (815), a channel II is connected with an eighth electromagnetic pinch valve (708) through a twelfth Y-shaped three-way joint (812), a channel I of the ninth electromagnetic pinch valve (709) is connected with the total nitrogen digestion pipe, a channel II is connected with the total phosphorus digestion pipe, a channel I of the eighth electromagnetic pinch valve (708) is connected with the reaction tank (404), and a channel II is connected with the digestion tank (504);
one end of the fourth peristaltic pump (1104) is connected with the reaction tank (404), the other end of the fourth peristaltic pump is connected with a tenth electromagnetic pinch valve (710) through a sixteenth Y-shaped three-way joint (816), a channel I of the tenth electromagnetic pinch valve (710) is connected with the colorimetric tank (603), and a channel II is connected with the total phosphorus digestion tube;
One end of the sixth peristaltic pump (1106) is connected with the reaction tank (404), the other end of the sixth peristaltic pump is connected with an eleventh electromagnetic pinch valve (711) through a seventeenth Y-shaped three-way joint (817), a channel I of the eleventh electromagnetic pinch valve (711) is connected with the total nitrogen digestion pipe, and a channel II is connected with the colorimetric tank (603);
one end of the fifth peristaltic pump (1105) is connected with the digestion tank (504), the other end of the fifth peristaltic pump is connected with a twelfth electromagnetic pinch valve (712) through an eighteenth Y-shaped three-way joint (818), a channel I of the twelfth electromagnetic pinch valve (712) is connected with a cleaning water discharge channel (12), and a channel II is connected with a waste liquid discharge channel (13);
wherein, each electromagnetic pinch valve is connected with the control terminal electricity, feeds back the signal to the control terminal and is controlled by the control terminal.
4. The water quality parameter monitor according to claim 1, wherein the digestion component (3) comprises a digestion tube (302) with a double-layer hollow sandwich structure, a first temperature sensor (304) attached to the outer wall of the digestion tube (302), a first heating device (303) wrapped on the outer wall of the digestion tube (302), an ultraviolet lamp tube (305) inserted into the inner cavity of the digestion tube (302) and a protective cover (301) covered outside the digestion tube (302); the hollow interlayer of the digestion tube (302) is divided into a total phosphorus digestion tube and a total nitrogen digestion tube which are not communicated with each other, the total phosphorus digestion tube is provided with a total phosphorus sample inlet (306) and a total phosphorus overflow port (307), and the total nitrogen digestion tube is provided with a total nitrogen sample inlet (308) and a total nitrogen overflow port (309);
The first temperature sensor (304), the first heating device (303) and the ultraviolet lamp tube (305) are electrically connected with the control terminal, and feedback signals to the control terminal and are controlled by the control terminal.
5. The water quality parameter monitor according to claim 1, wherein the reaction assembly (4) further comprises a first motor (401) arranged outside the reaction tank (404), a first magnet (402) fixedly arranged on the first motor (401), a first magnet (403) arranged in the reaction tank (404) and corresponding to the first magnet (402), and a second heating device (405) and a second temperature sensor (406) arranged in the reaction tank (404); the reaction tank (404) is provided with a sample inlet and an overflow port;
the first motor (401), the second heating device (405) and the second temperature sensor (406) are all electrically connected with the control terminal, and feedback signals to the control terminal and are controlled by the control terminal.
6. The water quality parameter monitor according to claim 1, wherein the digestion titration assembly (5) further comprises a second motor (501) arranged outside the digestion tank (504), a second magnet (502) fixedly arranged on the second motor (501), a second magnet (503) arranged in the digestion tank (504) and corresponding to the second magnet (502), a third heating device (505) and a quartz tube (506) arranged in the digestion tank (504), wherein a third temperature sensor (507) is arranged in the quartz tube (506), and heat conducting silica gel for protecting the third temperature sensor (507) is filled in the quartz tube; the digestion titration assembly (5) further comprises an indication electrode (508) and a reference electrode (512), wherein one end of the indication electrode (508) is inserted into the digestion tank (504), one end of the reference electrode (512) is inserted into a liquid storage tank (511), the liquid storage tank (511) is connected with one end of a salt bridge (509) through a hose (510), and the other end of the salt bridge (509) is inserted into the digestion tank (504); the digestion tank (504) is provided with a sample inlet and an overflow port;
The second motor (501), the third heating device (505), the third temperature sensor (507), the indicating electrode (508) and the reference electrode (512) are all electrically connected with the control terminal, and feedback signals to the control terminal and are controlled by the control terminal.
7. The water quality parameter monitor according to claim 1, wherein the colorimetric measurement assembly (6) further comprises an opaque housing disposed outside the cuvette (603), a scintillation xenon lamp (601) connected to one side of the opaque housing via a first optical fiber (602), and a micro spectrometer (605) connected to the other side of the opaque housing via a second optical fiber (604); the colorimetric pool (603) is provided with a sample inlet and an overflow port;
the flash xenon lamp (601) and the micro spectrometer (605) are electrically connected with the control terminal, and the flash xenon lamp and the micro spectrometer feed back signals to the control terminal and are controlled by the control terminal.
8. The water quality parameter monitor according to claim 1, wherein the first multi-channel valve (101) is a ten-channel valve, wherein channel a is a liquid outlet, channel b is a cleaning water outlet, channel c is a waste liquid outlet, channel d is a first ammonia nitrogen detection reagent, channel e is a second ammonia nitrogen detection reagent, channel f is a first total nitrogen detection reagent, channel g is a second total nitrogen detection reagent, and channels h, i and j are backup channels;
The second multi-channel valve (201) is a ten-channel valve, wherein a channel a is a liquid outlet, a channel b is a cleaning water outlet, a channel c is a liquid outlet, a channel d is a first total phosphorus detection reagent, a channel e is a second total phosphorus detection reagent, a channel f is a third total phosphorus detection reagent, a channel g is a first permanganate index detection reagent, a channel h is a second permanganate index detection reagent, a channel i is a third permanganate index detection reagent, and a channel j is a standby channel.
9. A water quality parameter monitoring method of a water quality parameter monitor as claimed in any one of claims 1 to 8, comprising:
the control terminal controls the second peristaltic pump (1102) to inject quantitative water sample to be detected into the total phosphorus digestion tube, the total nitrogen digestion tube, the reaction tank (404) and the digestion tank (504), controls the fourth peristaltic pump (1104) to pump the water sample to be detected in the total phosphorus digestion tube to the reaction tank (404), controls the sixth peristaltic pump (1106) to pump the water sample to be detected in the total nitrogen digestion tube to the reaction tank (404), and controls the fifth peristaltic pump (1105) to empty the water sample to be detected in the digestion tank (504);
controlling a fourth peristaltic pump (1104) or a sixth peristaltic pump (1106) to pump a water sample to be detected in the reaction tank (404) to a colorimetric tank (603) for absorbance measurement, obtaining nitrate absorbance and CODuv absorbance, obtaining the content of nitrate and CODuv in the water sample to be detected according to the nitrate absorbance and the CODuv absorbance, and emptying the water sample to be detected in the colorimetric tank (603);
Controlling a second peristaltic pump (1102) to inject a quantitative water sample to be detected into the reaction tank (404), and controlling a first multichannel valve (101) and a first injection pump (102) to inject a quantitative first ammonia nitrogen detection reagent and a quantitative second ammonia nitrogen detection reagent into the reaction tank (404) to perform ammonia nitrogen reaction;
controlling a second peristaltic pump (1102) to inject a quantitative water sample to be detected into the total nitrogen digestion tube, and controlling a first multichannel valve (101) and a first injection pump (102) to inject a quantitative first total nitrogen detection reagent and a quantitative second total nitrogen detection reagent into the total nitrogen digestion tube to perform total nitrogen digestion;
controlling a second peristaltic pump (1102) to inject a quantitative water sample to be detected into the total phosphorus digestion tube, and controlling a second multi-channel valve (201) and a second injection pump (202) to inject a quantitative first total phosphorus detection reagent into the total phosphorus digestion tube to perform total phosphorus digestion;
controlling a second peristaltic pump (1102) to inject a quantitative water sample to be detected into the digestion tank (504), and controlling a second multi-channel valve (201) and a second injection pump (202) to inject a quantitative first permanganate index detection reagent and a quantitative third permanganate index detection reagent into the digestion tank (504) to carry out permanganate index digestion;
when the ammonia nitrogen reaction in the reaction tank (404) is completed, controlling a fourth peristaltic pump (1104) or a sixth peristaltic pump (1106) to pump the ammonia nitrogen color development liquid in the reaction tank (404) to a colorimetric tank (603) for absorbance measurement, obtaining ammonia nitrogen absorbance, obtaining the ammonia nitrogen content in the water sample to be detected according to the ammonia nitrogen absorbance, and evacuating the ammonia nitrogen color development liquid in the colorimetric tank (603);
Controlling a third peristaltic pump (1103) to inject quantitative cleaning water into the reaction tank (404), controlling a fourth peristaltic pump (1104) or a sixth peristaltic pump (1106) to pump the cleaning water in the reaction tank (404) to the colorimetric tank (603), and evacuating the cleaning water in the colorimetric tank (603);
when the total nitrogen digestion in the total nitrogen digestion pipe is completed, controlling a sixth peristaltic pump (1106) to pump the total nitrogen digestion liquid in the total nitrogen digestion pipe to the reaction tank (404) for cooling, controlling the sixth peristaltic pump (1106) to pump the total nitrogen digestion liquid cooled in the reaction tank (404) to the colorimetric tank (603) for absorbance measurement, obtaining total nitrogen absorbance, obtaining the total nitrogen content in the water sample to be measured according to the total nitrogen absorbance, and evacuating the total nitrogen digestion liquid in the colorimetric tank (603);
controlling a third peristaltic pump (1103) to inject quantitative cleaning water into the total nitrogen digestion pipe, controlling a sixth peristaltic pump (1106) to pump the cleaning water in the total nitrogen digestion pipe to the reaction tank (404), controlling the sixth peristaltic pump (1106) to pump the cleaning water in the reaction tank (404) to the colorimetric tank (603), and evacuating the cleaning water in the colorimetric tank (603);
when the total phosphorus digestion in the total phosphorus digestion tube is completed, controlling a fourth peristaltic pump (1104) to pump the total phosphorus digestion liquid in the total phosphorus digestion tube to a reaction tank (404) for cooling, and controlling the fourth peristaltic pump (1104) to pump the total phosphorus digestion liquid quantitatively cooled in the reaction tank (404) to a colorimetric tank (603) for absorbance measurement to obtain background absorbance;
Controlling a second multi-channel valve (201) and a second injection pump (202) to inject quantitative second total phosphorus detection reagent and quantitative third total phosphorus detection reagent into the reaction tank (404), and carrying out total phosphorus color reaction with the residual total phosphorus digestion solution in the reaction tank (404);
when the color development reaction of the total phosphorus in the reaction tank (404) is completed, controlling a fourth peristaltic pump (1104) to pump the color development liquid of the total phosphorus in the reaction tank (404) to a colorimetric tank (603) for absorbance measurement, obtaining absorbance of the color development liquid, obtaining absorbance of the total phosphorus according to absorbance of the background and absorbance of the color development liquid, obtaining the content of the total phosphorus in a water sample to be detected according to absorbance of the total phosphorus, and evacuating the color development liquid of the total phosphorus in the colorimetric tank (603);
controlling a third peristaltic pump (1103) to inject quantitative cleaning water into the total phosphorus digestion tube, controlling a fourth peristaltic pump (1104) to pump the cleaning water in the total phosphorus digestion tube to the reaction tank (404), controlling the fourth peristaltic pump (1104) to pump the cleaning water in the reaction tank (404) to the colorimetric tank (603), and emptying the cleaning water in the colorimetric tank (603);
after the permanganate index digestion in the digestion tank (504) is completed, controlling a second multi-channel valve (201) and a second injection pump (202) to inject a quantitative second permanganate index detection reagent into the digestion tank (504), controlling the second multi-channel valve (201) and the second injection pump (202) to instill a third permanganate index detection reagent into the digestion tank (504) one by one until a preset stopping condition is reached, calculating and obtaining the content of the permanganate index in the water sample to be tested, and controlling a fifth peristaltic pump (1105) to empty the liquid in the digestion tank (504);
Controlling a third peristaltic pump (1103) to inject quantitative cleaning water into the digestion tank (504), and controlling a fifth peristaltic pump (1105) to empty liquid in the digestion tank (504);
and when the temperature in the total phosphorus digestion tube and the total nitrogen digestion tube reaches a preset temperature threshold in the total phosphorus digestion tube and the total nitrogen digestion process, controlling a first peristaltic pump (1101) to blow air into the total phosphorus digestion tube and the total nitrogen digestion tube.
10. The method of claim 9, wherein calculating the permanganate index content of the water sample to be measured comprises:
calculating the volume of the third permanganate index detection reagent instilled into the obtained orientation digestion tank (504) according to the rotation number of the stepping motor in the second injection pump (202);
according to the volume of the third permanganate index detection reagent instilled into the digestion tank (504), calculating and obtaining the content of the permanganate index in the water sample to be detected;
the calculation formula of the content of permanganate index in the water sample to be measured is as follows:
；
wherein,for the content of permanganate index in the water sample to be tested, < >>To instill the volume of the third permanganate index detection reagent into the digestion tank (504)>Titration of the volume of spent third permanganate index assay reagent for blank permanganate index assay, +. >The concentration of the reagent is detected for the second permanganate index.
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| CN202410245122.0A CN117825367B (en) | 2024-03-05 | Water quality parameter monitor and monitoring method |
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| CN202410245122.0A CN117825367B (en) | 2024-03-05 | Water quality parameter monitor and monitoring method |
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| CN106442099A (en) * | 2016-11-08 | 2017-02-22 | 深圳市丹耐美克环保科技有限责任公司 | Device and method for degrading and measuring total phosphorus and total nitrogen in water sample |
| CN212432950U (en) * | 2020-04-27 | 2021-01-29 | 锦汐(上海)环境科技有限公司 | Multi-parameter water quality on-line analyzer |
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| CN102455332A (en) * | 2010-10-26 | 2012-05-16 | 桂林欧博仪器技术有限公司 | Automatic titration device for analysis instrument |
| CN205581047U (en) * | 2015-12-29 | 2016-09-14 | 南京洁态环保科技有限公司 | Measure water chemical oxygen demand's automatic on -line monitor |
| CN106442099A (en) * | 2016-11-08 | 2017-02-22 | 深圳市丹耐美克环保科技有限责任公司 | Device and method for degrading and measuring total phosphorus and total nitrogen in water sample |
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