CN110596031A - Quantitative analysis device for ammonia nitrogen in seawater - Google Patents
Quantitative analysis device for ammonia nitrogen in seawater Download PDFInfo
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- CN110596031A CN110596031A CN201910971035.2A CN201910971035A CN110596031A CN 110596031 A CN110596031 A CN 110596031A CN 201910971035 A CN201910971035 A CN 201910971035A CN 110596031 A CN110596031 A CN 110596031A
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- 239000013535 sea water Substances 0.000 title claims abstract description 32
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000004445 quantitative analysis Methods 0.000 title claims abstract description 6
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 46
- 239000007789 gas Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims description 61
- 238000010521 absorption reaction Methods 0.000 claims description 34
- 238000005070 sampling Methods 0.000 claims description 21
- 230000002572 peristaltic effect Effects 0.000 claims description 19
- 229910052724 xenon Inorganic materials 0.000 claims description 19
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 16
- 229910021529 ammonia Inorganic materials 0.000 claims description 15
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- 239000002699 waste material Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- 239000013307 optical fiber Substances 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 27
- 238000000034 method Methods 0.000 abstract description 24
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000000862 absorption spectrum Methods 0.000 abstract description 3
- 239000000049 pigment Substances 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 238000002835 absorbance Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000001228 spectrum Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 7
- 238000002211 ultraviolet spectrum Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- VRZJGENLTNRAIG-UHFFFAOYSA-N 4-[4-(dimethylamino)phenyl]iminonaphthalen-1-one Chemical compound C1=CC(N(C)C)=CC=C1N=C1C2=CC=CC=C2C(=O)C=C1 VRZJGENLTNRAIG-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005375 photometry Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 238000003902 seawater pollution Methods 0.000 description 2
- CRWJEUDFKNYSBX-UHFFFAOYSA-N sodium;hypobromite Chemical compound [Na+].Br[O-] CRWJEUDFKNYSBX-UHFFFAOYSA-N 0.000 description 2
- NTBCKHYJDZJCIN-UHFFFAOYSA-N 2-hydroxybenzoic acid;hypochlorous acid Chemical compound ClO.OC(=O)C1=CC=CC=C1O NTBCKHYJDZJCIN-UHFFFAOYSA-N 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Abstract
The invention discloses a quantitative analysis device for ammonia nitrogen in seawater, which is used for preparing ammonia nitrogen dissolved in seawater and quantitatively detecting the concentration of the prepared ammonia gas. The device comprises a preparation unit, a measurement unit and a data processing and control unit. The data processing and control unit can control the operation sequence of each part of the device and process the acquired spectrum signals so as to obtain the concentration of ammonia nitrogen. The device prepares ammonia gas from seawater by adding an alkaline reagent, obtains the absorbance of the gas by adopting an ultraviolet-visible absorption spectrum method, and analyzes the concentration of the gas by adopting a fast Fourier transform method. Compared with the traditional measuring method, the method has the advantages of simple operation, short measuring time and high automation degree, is not easily interfered by pigment and particulate matters in water, and improves the accuracy of system measurement; the monitoring level of the environmental protection department on the ammonia nitrogen in the seawater body is improved, and powerful technical support is provided for effectively preventing and controlling the ammonia nitrogen pollution of the water body.
Description
Technical Field
The invention relates to the field of online monitoring of environmental pollution of seawater bodies, in particular to the technical field of environmental optical monitoring, and specifically relates to a quantitative analysis device for ammonia nitrogen in seawater.
Background
Seawater resources are important resources for survival and development of human beings, seawater pollution can have important influence on the stability of marine ecology, so that the diversity of marine organisms is damaged, and great loss can be caused to marine fishery and marine culture, so that the detection of the quality of seawater is particularly important.
With the development of economic society of China, the seawater pollution is more and more serious. The contents of ammonia nitrogen and hydrogen sulfide in seawater are increased by marine culture in various places of coastal areas, domestic sewage in coastal cities, industrial wastewater discharge and the like. The ammonia nitrogen is an important factor for limiting the growth and total yield of plants in seawater, when the content of the ammonia nitrogen is too high, seawater is eutrophicated, and algae in the ocean can propagate and grow in a large quantity, so that red tide occurs, a large amount of marine organisms die, and great loss is caused to marine fishery.
According to the marine survey standards and the marine monitoring standards of China, the main methods for detecting the content of ammonia nitrogen in seawater in China are a sodium hypobromite oxidation method and an indophenol blue method. The sodium hypobromite oxidation method needs a large amount of chemical reagents and is complex in operation process, a seawater sample can be tested after being filtered by an oil film, the seawater sample needs to be tested immediately after being collected, otherwise the seawater sample needs to be refrigerated and stored, and in addition, ammonia gas in air in the measurement process can also influence the accuracy of the result. The indophenol blue method is easily affected by metal ions in seawater, uses more chemical reagents and toxic reagents, is complex to operate, has long analysis time, and also needs oil film filtration to prevent ammonia in air from being affected. In addition, methods for detecting ammonia nitrogen in water bodies include a Nashin reagent photometry, a salicylic acid-hypochlorous acid photometry and the like, but the methods are not suitable for measuring ammonia nitrogen in seawater. The method adopts a xenon lamp to irradiate ammonia gas to obtain an ultraviolet spectrum, and the concentration is calculated by analyzing the absorbance. The method only needs to add the alkaline reagent, and compared with the method, the method has the advantages of less reagent consumption, simple operation and no influence of pigment and pollutants in the seawater. The system can directly detect seawater after sampling without water sample pretreatment, has high detection speed, avoids complex steps and can carry out real-time monitoring.
Disclosure of Invention
In order to solve the technical problems, the invention provides a device which does not need manual guard, is simple to operate, has high automation degree and can realize real-time continuous detection. The device is composed of a preparation unit, a circulation unit, a measurement unit and a data processing and control unit, and achieves the purpose of measuring ammonia nitrogen rapidly and accurately in real time. The measuring method adopted by the device is different from the traditional method for measuring the content of ammonia nitrogen in seawater, the traditional method is abandoned, and a new device is built, so that the detection of ammonia nitrogen is completed in a gaseous state.
The specific technical scheme is as follows:
a quantitative analysis device for ammonia nitrogen in seawater comprises a preparation unit, a measurement unit and a data processing and control unit;
the preparation unit consists of a sample introduction part and a reaction container; the sample introduction part comprises a water sample inlet device and a reagent inlet device; the reaction vessel is of a cylindrical structure, the side surface of the reaction vessel is provided with an air inlet, a sampling port, a reagent port and a water inlet from top to bottom in sequence, the bottom of the reaction vessel is provided with a waste liquid outlet, and the upper part of the reaction vessel is provided with a gas outlet;
the water inlet device comprises a sampling pump, the water inlet end of the sampling pump is connected with the water sample pool, and the water outlet end of the sampling pump is connected with the reaction container;
the reagent feeding device comprises a peristaltic pump, the output end of the peristaltic pump is connected with the reagent port, and the inlet end of the peristaltic pump is connected with the reagent bottle;
the air inlet is connected with an air-ammonia conversion valve;
the waste liquid outlet is connected with a drain valve; the gas outlet is connected with an exhaust valve;
the measuring unit comprises an absorption cell, a xenon lamp light source and a spectrometer, wherein lenses are arranged at the upper end and the lower end of the absorption cell; the xenon lamp light source is arranged at the bottom of the absorption cell, a first lens is arranged between the xenon lamp light source and the bottom of the absorption cell, the upper part of the absorption cell is provided with a spectrometer, and a second lens is arranged between the spectrometer and the absorption cell; light emitted by a xenon lamp light source sequentially passes through the bottom end of the absorption cell, the first lens, gas in the absorption cell and the second lens and then reaches the spectrometer through the optical fiber;
the upper part of the absorption pool is a gas inlet, the lower end of the absorption pool is a gas outlet, the gas inlet is connected with a sampling port of the reaction container, the gas outlet is connected with an air pump, and the air pump is connected with the bottom of the reaction container;
the spectrometer is connected with the data processing and control unit;
the data processing and control unit is connected with various pumps, valves, xenon light sources and spectrometers in the device.
The air pump is connected to the bottom of the reaction vessel through a check valve.
The air-ammonia gas conversion valve is connected with the activated carbon gas source processor.
The inlet end of the peristaltic pump is connected with the output end of the three-way electromagnetic valve, two inlet ends of the three-way electromagnetic valve are respectively connected with two container bottles, and the two container bottles are respectively filled with a reaction reagent concentrated sodium hydroxide solution and a cleaning reagent diluted sulfuric acid solution.
The invention has the advantages that:
1. the ammonia nitrogen is measured by adopting an ultraviolet-visible absorption spectrum method, so that the use of a large amount of chemical reagents in the traditional method is avoided.
2. The ammonia nitrogen concentration is measured in the gas phase, so that the influence of pigments and particles in water on measurement can be avoided, and the measurement accuracy is improved.
3. The water sample acquisition, the reagent addition, the liquid and gas discharge after the test and the like realize automation, and the complicated manual operation steps are avoided.
4. The device can realize the automatic acquisition of seawater sample, need not artifical sample, and one-time measuring time is very short, and one-time sampling can carry out a lot of measurements, makes equipment can realize real-time, continuous detection.
5. The device adds few reagents during measurement, does not need manual configuration and is nontoxic, waste liquid after measurement is nontoxic, and the device can be directly discharged by adding a proper amount of acid without polluting the environment.
6. After every measurement, the peristaltic pump can pump the washing liquid and wash the device, makes reaction vessel keep clean, and the solenoid valve of business turn over air also can open, makes the air in the device circulate with the external world, guarantees the accuracy of next measurement.
Drawings
FIG. 1 is a schematic structural view of the present patent;
FIG. 1, activated carbon source processor 1; 2. an air-ammonia conversion valve; 3. a reaction vessel; 4. a sampling pump; 5. a three-way electromagnetic valve; 6. a peristaltic pump; 7. a drain valve; 8. a check valve; 9. an air pump; 10. a xenon light source; 11. a first lens; 12. an absorption tank; 13. a second lens; 14. an optical fiber; 15. a spectrometer; 16. a data processing and control unit; 17. and (4) exhausting the valve.
FIG. 2 is a flow chart of the detection of the present patent;
FIG. 3 is a schematic view of a reagent inlet port connection.
Detailed Description
The structure of the invention is shown in figure 1, and comprises a preparation unit, a measurement unit and a data processing and control unit;
the preparation unit consists of a sample introduction part and a reaction container; the sample introduction part comprises a water sample inlet device and a reagent inlet device; the reaction container 3 is of a cylindrical structure, the side surface of the reaction container is provided with an air inlet 31, a sampling port 32, a reagent port 33 and a water inlet 34 from top to bottom in sequence, the bottom of the reaction container is provided with a waste liquid outlet 35, and the upper part of the reaction container is provided with a gas outlet 36;
the water inlet device comprises a sampling pump 4, the water inlet end of the sampling pump 4 is connected with the water sample pool, and the water outlet end is connected with the water inlet 34 of the reaction container 3;
the reagent feeding device comprises a peristaltic pump 6, the output end of the peristaltic pump 6 is connected with the reagent port 33, and the inlet end of the peristaltic pump is connected with the reagent bottle;
the air inlet 31 is connected with the air-ammonia gas conversion valve 2;
the waste liquid outlet 35 is connected with the drain valve 7; the gas outlet 36 is connected with the exhaust valve 17;
the measuring unit comprises an absorption cell 12, a xenon lamp light source 10 and a spectrometer 15, wherein lenses are arranged at the upper end and the lower end of the absorption cell 12; the xenon lamp light source 10 is arranged at the bottom of the absorption cell, a first lens 11 is arranged between the xenon lamp light source 10 and the bottom of the absorption cell 12, the spectrometer is arranged at the upper part of the absorption cell, and a second lens 13 is arranged between the spectrometer and the absorption cell; light emitted by the xenon lamp light source sequentially passes through the bottom end of the absorption cell, the first lens, gas in the absorption cell and the second lens and then reaches the spectrometer 15 through the optical fiber;
the upper part of the absorption cell is a gas inlet 121, the lower end is a gas outlet 122, the gas inlet 121 is connected with a sampling port 32 of the reaction container, the gas outlet 122 is connected with an air pump 9, and the air pump 9 is connected with the bottom of the reaction container 3;
the spectrometer is connected with a data processing and control unit 16;
the data processing and control unit is connected with various pumps, valves, xenon light sources and spectrometers in the device.
The air pump is connected to the bottom of the reaction vessel through a check valve 8.
The air-ammonia gas conversion valve is connected with the activated carbon gas source processor 1.
The inlet end of the peristaltic pump is connected with the output end of the three-way electromagnetic valve 5, two inlet ends of the three-way electromagnetic valve 5 are respectively connected with two container bottles, and the two container bottles are respectively filled with a reaction reagent concentrated sodium hydroxide solution and a cleaning reagent dilute sulfuric acid solution.
The device may be disposed within the housing 20.
The invention prepares ammonia nitrogen in seawater in a gas form, obtains ammonia ultraviolet spectrum and analyzes the ammonia ultraviolet spectrum, thereby inverting the gas concentration.
Principle of measurement
The measurement principle is based on the ultraviolet absorption spectrum of ammonia gas in equilibrium with dissolved ammonia in a water sample. The ammonia gas has a plurality of absorption peaks at the wavelength of 190-205 nm, the absorption peaks are analyzed by adopting a fast Fourier transform method, a characteristic signal of the ammonia gas is extracted, and then the concentration of the ammonia gas is obtained through inversion. Adding 10% sodium hydroxide reagent into seawater sample to make chemical reactionProceeding to the right, the ammonia nitrogen in seawater can be extracted in the form of ammonia gas, and when the pH of the solution is more than 12, NH4+ in the solution can be ignored.
The operation of the whole apparatus will be described below
The device consists of a preparation unit, a circulation unit, a measurement unit and a data processing and control unit. Wherein the preparation unit consists of a sample introduction part and a reaction container. The sample introduction part comprises a water inlet sample and a reagent inlet. The sampling pump controls the water sample inflow, and the air-ammonia conversion valve can selectively control the air and ammonia. The reagent feeding portion container bottle 52 is used for containing a reaction reagent concentrated sodium hydroxide solution, and the container bottle 53 is used for containing a cleaning reagent diluted sulfuric acid solution. The capacity of the container bottle is about 1.5 liters, so that the reagent can meet the requirement of long-time measurement, and the frequent addition of the reagent is avoided. The three-way electromagnetic valve 5 is used for selecting the type of the added reagent, and the peristaltic pump 6 sucks the reagent into the reaction vessel. The reaction container 3 is a glass cylindrical structure with two circular ends, the bottom of the reaction container is provided with a waste liquid outlet, and the upper part of the reaction container is provided with a gas outlet. The circulating unit is a sealed whole formed by connecting a reaction container, an absorption pool, an air pump and the like by using a polyethylene pipe, and a check valve 8 is arranged at an air inlet section at the bottom end of the reaction pool and used for preventing liquid from flowing back.
Two outer containers in the device are used for containing reagent solution, both containers are larger than the reaction container, and the use amount of the reagent in the containers is strictly controlled by a peristaltic pump. The three-way electromagnetic valve can freely switch between extracting reaction reagent and cleaning liquid. The maximum lift of the sampling pump can reach 6 meters, and the sampling pump can directly extract a water sample from the ocean to enter the reaction container and also can extract the water sample from a container for containing the water sample. The gas communication between the gas inside the apparatus and the outside air and between the containers is controlled by the air-ammonia gas changeover valve 2, the exhaust valve 17 and the air pump 9. The reaction vessel provides a location for the production of gas, and the total amount of liquid added per time should be less than one third of the reaction vessel. The absorption cell 12 is the site of gas detection. Ultraviolet fused quartz lenses are arranged on the upper surface and the lower surface of the flow cell, and light is converged on the optical fiber head. The spectrometer 15 selects an instrument with high resolution and accuracy. The air pump 9 provides power for the circulation of gas in the system. The check valve prevents liquid at the bottom of the reaction vessel from flowing back into the flow cell.
When the ultraviolet spectrum of the air needs to be measured, the air-ammonia conversion electromagnetic valve 2 is controlled to allow the air to enter, the air circulates in the circulating unit under the action of the air pump, the air is discharged from the exhaust pipe opening controlled by the exhaust valve 17, after a period of time, the light of the xenon lamp passes through the quartz lens, the gas in the circulating pool, the quartz lens, and the optical fiber transmits an optical signal to the spectrometer.
When the ammonia ultraviolet spectrum needs to be measured, firstly, an air-ammonia conversion electromagnetic valve is adjusted to close an air inlet passage, a gas inlet passage in a reaction container is opened, and an electromagnetic valve of an exhaust port is closed to enable ammonia to circulate in a closed circulation unit. And adjusting the three-way electromagnetic valve to enable the concentrated sodium hydroxide solution to enter the reaction container under the pumping of the peristaltic pump, and enabling a seawater sample to enter the reaction container through the water pump to react with the reagent to prepare ammonia. The reagent inflow and the water sample inflow are strictly controlled by a peristaltic pump and a sampling pump respectively, and an air pump provides power for flowing ammonia; and after the concentration of the gas in the circulating unit is stable, controlling a xenon lamp, a photoelectric detector and a spectrometer to measure.
When the measurement is finished, the waste liquid and the exhaust gas are discharged. In addition, the device needs to be cleaned, and a three-way electromagnetic valve is adjusted to enable dilute sulfuric acid cleaning liquid in an external container to enter the reaction container for cleaning under the action of the peristaltic pump 6.
In the invention, the spectrometer model is as follows: ocean optics corporation QE65 Pro; air pump model: KJ-24V; the type of the water pump is as follows: OEM-UB 04; the data processing and control unit is commercially available product such as porphyry PCM3363 from violoxing technologies ltd, beijing.
Claims (4)
1. A quantitative analysis device for ammonia nitrogen in seawater is characterized in that: the device comprises a preparation unit, a measurement unit and a data processing and control unit;
the preparation unit consists of a sample introduction part and a reaction container; the sample introduction part comprises a water sample inlet device and a reagent inlet device; the reaction vessel is of a cylindrical structure, the side surface of the reaction vessel is provided with an air inlet, a sampling port, a reagent port and a water inlet from top to bottom in sequence, the bottom of the reaction vessel is provided with a waste liquid outlet, and the upper part of the reaction vessel is provided with a gas outlet;
the water inlet device comprises a sampling pump, the water inlet end of the sampling pump is connected with the water sample pool, and the water outlet end of the sampling pump is connected with the reaction container;
the reagent feeding device comprises a peristaltic pump, the output end of the peristaltic pump is connected with the reagent port, and the inlet end of the peristaltic pump is connected with the reagent bottle;
the air inlet is connected with an air-ammonia conversion valve;
the waste liquid outlet is connected with a drain valve; the gas outlet is connected with an exhaust valve;
the measuring unit comprises an absorption cell, a xenon lamp light source and a spectrometer, wherein lenses are arranged at the upper end and the lower end of the absorption cell; the xenon lamp light source is arranged at the bottom of the absorption cell, a first lens is arranged between the xenon lamp light source and the bottom of the absorption cell, the upper part of the absorption cell is provided with a spectrometer, and a second lens is arranged between the spectrometer and the absorption cell; light emitted by a xenon lamp light source sequentially passes through the bottom end of the absorption cell, the first lens, gas in the absorption cell and the second lens and then reaches the spectrometer through the optical fiber;
the upper part of the absorption pool is a gas inlet, the lower end of the absorption pool is a gas outlet, the gas inlet is connected with a sampling port of the reaction container, the gas outlet is connected with an air pump, and the air pump is connected with the bottom of the reaction container;
the spectrometer is connected with the data processing and control unit;
the data processing and control unit is connected with various pumps, valves, xenon light sources and spectrometers in the device.
2. The apparatus for quantitatively analyzing ammonia nitrogen in seawater according to claim 1, characterized in that: the air pump is connected to the bottom of the reaction vessel through a check valve.
3. The apparatus for quantitatively analyzing ammonia nitrogen in seawater according to claim 1, characterized in that: the air-ammonia gas conversion valve is connected with the activated carbon gas source processor.
4. The apparatus for quantitatively analyzing ammonia nitrogen in seawater according to claim 1, characterized in that: the inlet end of the peristaltic pump is connected with the output end of the three-way electromagnetic valve, two inlet ends of the three-way electromagnetic valve are respectively connected with two container bottles, and the two container bottles are respectively filled with a reaction reagent concentrated sodium hydroxide solution and a cleaning reagent diluted sulfuric acid solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910971035.2A CN110596031A (en) | 2019-10-14 | 2019-10-14 | Quantitative analysis device for ammonia nitrogen in seawater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910971035.2A CN110596031A (en) | 2019-10-14 | 2019-10-14 | Quantitative analysis device for ammonia nitrogen in seawater |
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| CN110596031A true CN110596031A (en) | 2019-12-20 |
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| CN201910971035.2A Pending CN110596031A (en) | 2019-10-14 | 2019-10-14 | Quantitative analysis device for ammonia nitrogen in seawater |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111610282A (en) * | 2020-07-16 | 2020-09-01 | 生态环境部南京环境科学研究所 | Device and method for detecting residual quantity of abamectin B2a in water body |
| CN112730293A (en) * | 2020-12-28 | 2021-04-30 | 深圳市中科云驰环境科技有限公司 | Ammonia nitrogen water quality monitor and method based on spectrum analysis method |
| CN112903414A (en) * | 2021-02-08 | 2021-06-04 | 杭州帆昂环保科技有限公司 | Multi-parameter automatic water quality analysis method and system |
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| CN103091262A (en) * | 2011-11-04 | 2013-05-08 | 中国科学院电子学研究所 | Miniaturized optical device for detecting ammonia nitrogen in water and detecting method |
| CN104535506A (en) * | 2015-01-30 | 2015-04-22 | 四川清和科技有限公司 | Drainage basin ammonia-nitrogen concentration detection method |
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