CN111024794A - Continuous monitor for nitrate nitrogen in water and operation method thereof - Google Patents
Continuous monitor for nitrate nitrogen in water and operation method thereof Download PDFInfo
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- CN111024794A CN111024794A CN201911422835.5A CN201911422835A CN111024794A CN 111024794 A CN111024794 A CN 111024794A CN 201911422835 A CN201911422835 A CN 201911422835A CN 111024794 A CN111024794 A CN 111024794A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 70
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000002156 mixing Methods 0.000 claims abstract description 29
- 239000007853 buffer solution Substances 0.000 claims abstract description 25
- 230000002572 peristaltic effect Effects 0.000 claims abstract description 18
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 17
- 150000002500 ions Chemical class 0.000 claims abstract description 17
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims abstract description 13
- 230000008676 import Effects 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 63
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 21
- 239000000243 solution Substances 0.000 claims description 19
- 239000006228 supernatant Substances 0.000 claims description 17
- 239000012535 impurity Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 3
- 239000000084 colloidal system Substances 0.000 claims description 3
- 229910021645 metal ion Inorganic materials 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 14
- 238000007781 pre-processing Methods 0.000 abstract description 9
- 239000000523 sample Substances 0.000 description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000010865 sewage Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910000329 aluminium sulfate Inorganic materials 0.000 description 2
- 235000011128 aluminium sulphate Nutrition 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000004255 ion exchange chromatography Methods 0.000 description 2
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- YPNVIBVEFVRZPJ-UHFFFAOYSA-L silver sulfate Chemical compound [Ag+].[Ag+].[O-]S([O-])(=O)=O YPNVIBVEFVRZPJ-UHFFFAOYSA-L 0.000 description 2
- 229910000367 silver sulfate Inorganic materials 0.000 description 2
- 238000002798 spectrophotometry method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/333—Ion-selective electrodes or membranes
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- Life Sciences & Earth Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
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Abstract
The invention discloses a continuous monitor for nitrate nitrogen in water and an operation method thereof, which are characterized in that: the inlet tube install the water inlet department at the inlet pump, the inlet pump passes through the pipeline and is connected with preprocessing device, preprocessing device passes through the pipeline and is connected with the peristaltic pump, the peristaltic pump passes through the pipeline and is connected with first valve, first valve passes through the pipeline and is connected with blending tank left side water inlet, nitrate electrode and reference electrode are all installed in the blending tank, the export of buffer solution container bottom is passed through the pipeline and is connected with the blending tank, nitrate electrode and reference electrode all are connected with the ion activity meter through the cable, blending tank bottom delivery port passes through the pipeline and is connected with first emptying valve import department, the exit at first emptying valve is installed to the fluid-discharge tube. The invention has simple structure, adopts electrode method for monitoring, has simple and convenient operation, can directly output data, is less influenced by external factors, and is suitable for continuously monitoring nitrate nitrogen in water outdoors.
Description
Technical Field
The invention belongs to the technical field of automatic water quality monitors, and particularly relates to a continuous nitrate nitrogen monitor in water and an operation method thereof.
Background
The water quality monitoring is a process for monitoring and measuring the types of pollutants in a water body, the concentrations of various pollutants and the variation trend thereof and evaluating the water quality condition, and has a wide monitoring range, including natural water (rivers, lakes, seas and underground water) which is not polluted and is polluted, drainage in a rainwater and sewage pipe network, various industrial drainage and the like.
Nitrate nitrogen, abbreviated as NO3-N, is one of important indexes for measuring water quality, and is defined as total amount of NO 3-inorganic nitrogen contained in water, calculated by the gram of nitrogen contained in each liter of water. In the operation process of the sewage plant, the nitrate nitrogen concentration in the water can react the situations of aerobic nitrification and anoxic denitrification.
In CJ/T51-2018 urban wastewater quality standard inspection method, the used methods mainly include ultraviolet spectrophotometry, electrode method and ion chromatography. Ion chromatography requires high equipment investment and post-maintenance, and therefore this method is not considered for nitrate nitrogen continuous monitor applications.
The ultraviolet spectrophotometry has high precision and accuracy and is commonly used for analyzing and measuring water samples in laboratories, but the method has many problems and inconveniences that ① samples cannot directly obtain total nitrogen results after being tested, a formula is required to be sleeved for calculation, the measuring process is complicated, ② curve calibration needs to be carried out by using a standard solution before each measurement so as to ensure the accuracy of the results, a standard curve is drawn manually, ③ has complex operation due to the fact that the wavelength needs to be frequently switched between 220nm and 275nm when each sample is measured, ④ has great influence on the results due to the repetition of the wavelength, transmittance noise and drift indexes of the used ultraviolet photometer, ⑤ has higher requirements on the use conditions and the environment, vibration and drop in transportation and storage, temperature, humidity, electromagnetic interference, vibration noise, corrosive gas and the like of the environment during use, and the mechanical structure, precise positioning, spectral elements and the like in the ultraviolet photometer can be influenced by improper use and the use conditions.
When the existing nitrate nitrogen monitoring instrument is used for measuring the nitrate nitrogen content in water, the existing nitrate nitrogen monitoring instrument is easily interfered and influenced by suspended matters in the water, so that a sample introduction guide pipe is blocked or the surface of a probe is adhered by impurities, and the monitoring data is abnormal.
Disclosure of Invention
The invention aims to solve the technical problem of providing a continuous monitor for nitrate nitrogen in water and an operation method thereof aiming at the defects of the prior art, the continuous monitor is simple in structure, adopts an electrode method for monitoring, is simple and convenient to operate, can directly output data, is less influenced by external factors, and is suitable for continuously monitoring nitrate nitrogen in water outdoors.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a continuous monitor for nitrate nitrogen in water, which is characterized in that: including inlet tube, preprocessing device, first valve, nitrate electrode, buffer solution container, reference electrode, blending tank, ion activity meter, fluid-discharge tube, first emptying valve, peristaltic pump and intake pump, the inlet tube install the water inlet department at the intake pump, the intake pump pass through the pipeline and be connected with preprocessing device, preprocessing device pass through the pipeline and be connected with the peristaltic pump, the peristaltic pump pass through the pipeline and be connected with first valve, first valve pass through the pipeline and be connected with blending tank left side water inlet, nitrate electrode and reference electrode all install in the blending tank, buffer solution container bottom export pass through the pipeline and be connected with the blending tank and install the valve on the pipeline between buffer solution container and the blending tank, nitrate electrode and reference electrode all be connected with the ion activity meter through the cable, blending tank bottom delivery port pass through the pipeline and be connected with first emptying valve import department, the liquid discharge pipe is arranged at the outlet of the first emptying valve.
Foretell preprocessing device is by settling cask, second valve, aluminium sulfate container, sodium hydroxide container, third valve, fourth valve, supernatant collector, blow-down pipe and second blow-down valve, the supernatant collector install in the settling cask and the supernatant collector passes through the pipeline and is connected with the peristaltic pump, settling cask bottom delivery port pass through the pipeline and be connected with second blow-down valve import department, blow-down pipe install in second blow-down valve exit, the aluminium sulfate container pass through the pipeline and be connected with the second valve, the second valve pass through the pipeline and be connected with the settling cask, the sodium hydroxide container pass through the pipeline and be connected with the third valve, the third valve pass through the pipeline and be connected with the settling cask, fourth valve one end pass through the pipeline and be connected with the settling cask water inlet and the fourth valve other end passes through the pipeline and is connected with the intake pump.
The aluminum sulfate container in the pretreatment device is filled with aluminum sulfate solution with the concentration of 180 g/L.
The sodium hydroxide container in the pretreatment device is filled with a sodium hydroxide solution with the concentration of 500 g/L.
The buffer solution container is filled with buffer solution with the pH value of 2-4.
A method of operating a continuous monitor for nitrate nitrogen in water, comprising: comprises the following steps:
the method comprises the following steps: pumping a water sample to be detected through a water inlet pipe by a water inlet pump, and conveying the water sample to a settling tank in the pretreatment device;
step two: adding an aluminum sulfate solution with the concentration of 180g/L in an aluminum sulfate container and a sodium hydroxide solution with the concentration of 500g/L in a sodium hydroxide container into a settling tank to generate aluminum hydroxide colloid for adsorption and settlement, and eliminating the interference of suspended impurities and most metal ions in a sample;
step three: pretreating a water sample, standing for 5min, pumping 50mL of supernatant through a supernatant collector by a peristaltic pump, and placing the supernatant in a mixing tank;
step three: adding 2mL of buffer solution in a buffer solution container into a mixing tank, and recording a potential value E when the degree of the ion activity meter is stable;
step four: the corresponding nitrate concentration is obtained from the working curve according to the potential value E.
The invention adopts an electrode method to measure nitrate nitrogen in town sewage, and the test range of the nitrate nitrogen concentration is 0.16 mg/L-1000 mg/L. The nitrate ion selective electrode is a selective electrochemical sensor, and when it and reference electrode are formed into working cell, it can convert the ion activity of non-electric solution into potential, and when the total ion intensity in the sample is regulated to a certain value, the electromotive force E of the cell can be changed according to the change of ion concentration in the tested sample. The electrode method is simple and convenient to operate, data can be directly output, and the influence of external factors is small; the method is suitable for continuous monitoring of nitrate nitrogen in water outdoors.
The buffer solution (pH about 3): 6.66g of aluminum sulfate, 3.12g of silver sulfate, 1.24g of boric acid and 1.94g of sulfamic acid are weighed out in 600mL of water, the pH is adjusted to 3 with 200g/L of sodium hydroxide solution, and the solution is diluted to 1000 mL.
The invention has the advantages that: the device has the advantages of simple structure, adoption of an electrode method for monitoring, simplicity and convenience in operation, capability of directly outputting data, less influence of external factors and suitability for continuously monitoring nitrate nitrogen in water outdoors.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the pretreatment apparatus of the present invention.
Wherein the reference numerals are: the device comprises a water inlet pipe 1, a pretreatment device 2, a settling tank 201, a second valve 202, an aluminum sulfate container 203, a sodium hydroxide container 204, a third valve 205, a fourth valve 206, a supernatant collector 207, an emptying pipe 208, a second emptying valve 209, a first valve 3, a nitrate electrode 4, a buffer solution container 5, a reference electrode 6, a mixing tank 7, an ion activity meter 8, a liquid discharge pipe 9, a first emptying valve 10, a peristaltic pump 11 and a water inlet pump 12.
Detailed Description
The following further describes embodiments of the present invention in conjunction with the attached figures:
the first embodiment is as follows:
a continuous monitor for nitrate nitrogen in water, which is characterized in that: including inlet tube 1, preprocessing device 2, first valve 3, nitrate electrode 4, buffer solution container 5, reference electrode 6, blending tank 7, ion activity meter 8, fluid-discharge tube 9, first atmospheric valve 10, peristaltic pump 11 and intake pump 12, inlet tube 1 install the water inlet department at intake pump 12, intake pump 12 pass through the pipeline and be connected with preprocessing device 2, preprocessing device 2 pass through the pipeline and be connected with peristaltic pump 11, peristaltic pump 11 pass through the pipeline and be connected with first valve 3, first valve 3 pass through the pipeline and be connected with blending tank 7 left side water inlet, nitrate electrode 4 and reference electrode 6 all install in blending tank 7, 5 bottom exports of buffer solution container install the valve through pipeline and blending tank 7 are connected and the pipeline between buffer solution container 5 and the blending tank 7, the nitrate electrode 4 and the reference electrode 6 are both connected with an ion activity meter 8 through cables, a water outlet at the bottom of the mixing tank 7 is connected with an inlet of a first emptying valve 10 through a pipeline, and a liquid discharge pipe 9 is arranged at an outlet of the first emptying valve 10.
In the embodiment, the pretreatment device 2 comprises a settling tank 201, a second valve 202, an aluminum sulfate container 203, a sodium hydroxide container 204, a third valve 205, a fourth valve 206, a supernatant collector 207, an emptying pipe 208 and a second emptying valve 209, the supernatant collector 207 is arranged in the settling tank 201 and the supernatant collector 207 is connected with the peristaltic pump 11 through a pipeline, the water outlet at the bottom of the settling tank 201 is connected with the inlet of a second emptying valve 209 through a pipeline, the emptying pipe 208 is arranged at the outlet of a second emptying valve 209, the aluminum sulfate container 203 is connected with a second valve 202 through a pipeline, the second valve 202 is connected with the settling tank 201 through a pipeline, the sodium hydroxide container 204 is connected with a third valve 205 through a pipeline, the third valve 205 is connected with the settling tank 201 through a pipeline, one end of the fourth valve 206 is connected with the water inlet of the settling tank 201 through a pipeline, and the other end of the fourth valve 206 is connected with the water inlet pump 12 through a pipeline.
In the examples, the aluminum sulfate container 203 of the pretreatment apparatus 2 was filled with an aluminum sulfate solution having a concentration of 180 g/L.
In the embodiment, the sodium hydroxide container 204 of the pretreatment device 2 is filled with a sodium hydroxide solution having a concentration of 500 g/L.
In the embodiment, a buffer solution with a pH value of 2-4 is filled in the buffer solution container 5.
Example two:
a method of operating a continuous monitor for nitrate nitrogen in water, comprising: comprises the following steps:
the method comprises the following steps: a water sample to be detected is extracted through a water inlet pipe 1 by a water inlet pump 12 and is conveyed into a settling tank 201 in a pretreatment device 2;
step two: adding an aluminum sulfate solution with the concentration of 180g/L in an aluminum sulfate container 203 and a sodium hydroxide solution with the concentration of 500g/L in a sodium hydroxide container 204 into a settling tank 201 to generate aluminum hydroxide colloid for adsorption and settling, and eliminating the interference of suspended impurities and most metal ions in a sample;
step three: pretreating a water sample, standing for 5min, and pumping 50mL of supernatant into a mixing tank 7 through a supernatant collector 207 by a peristaltic pump 11;
step three: 2mL of buffer solution in a buffer solution container 5 is added into a mixing tank 7, and a lower potential value E is recorded when the degree of the ion activity meter is stable;
step four: the corresponding nitrate concentration is obtained from the working curve according to the potential value E.
The invention adopts an electrode method to measure nitrate nitrogen in town sewage, and the test range of the nitrate nitrogen concentration is 0.16 mg/L-1000 mg/L. The nitrate ion selective electrode is a selective electrochemical sensor, and when it and reference electrode 6 are formed into a working cell, it can convert the ion activity of non-electric solution into electric potential, and when the total ion intensity in the sample is regulated to a certain value, the electromotive force E of the cell can be changed according to the change of ion concentration in the tested sample. The electrode method is simple and convenient to operate, data can be directly output, and the influence of external factors is small; the method is suitable for continuous monitoring of nitrate nitrogen in water outdoors. Buffer solution (pH about 3): 6.66g of aluminum sulfate, 3.12g of silver sulfate, 1.24g of boric acid and 1.94g of sulfamic acid are weighed out in 600mL of water, the pH is adjusted to 3 with 200g/L of sodium hydroxide solution, and the solution is diluted to 1000 mL.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (6)
1. A continuous monitor for nitrate nitrogen in water, which is characterized in that: comprises a water inlet pipe (1), a pretreatment device (2), a first valve (3), a nitrate electrode (4), a buffer solution container (5), a reference electrode (6), a mixing tank (7), an ion activity meter (8), a liquid discharge pipe (9), a first emptying valve (10), a peristaltic pump (11) and a water inlet pump (12), wherein the water inlet pipe (1) is arranged at the water inlet of the water inlet pump (12), the water inlet pump (12) is connected with the pretreatment device (2) through a pipeline, the pretreatment device (2) is connected with the peristaltic pump (11) through a pipeline, the peristaltic pump (11) is connected with the first valve (3) through a pipeline, the first valve (3) is connected with the left water inlet of the mixing tank (7) through a pipeline, the nitrate electrode (4) and the reference electrode (6) are both arranged in the mixing tank (7), buffer solution container (5) bottom export be connected through pipeline and blending tank (7) and buffer solution container (5) and install the valve on the pipeline between blending tank (7), nitrate electrode (4) and reference electrode (6) all be connected with ion activity meter (8) through the cable, blending tank (7) bottom delivery port be connected through pipeline and first atmospheric valve (10) import department, fluid-discharge tube (9) install the exit at first atmospheric valve (10).
2. The continuous monitor for nitrate nitrogen in water as claimed in claim 1, wherein: the pretreatment device (2) comprises a settling tank (201), a second valve (202), an aluminum sulfate container (203), a sodium hydroxide container (204), a third valve (205), a fourth valve (206), a supernatant collector (207), a vent pipe (208) and a second vent valve (209), wherein the supernatant collector (207) is arranged in the settling tank (201), the supernatant collector (207) is connected with a peristaltic pump (11) through a pipeline, a water outlet at the bottom of the settling tank (201) is connected with an inlet of the second vent valve (209) through a pipeline, the vent pipe (208) is arranged at an outlet of the second vent valve (209), the aluminum sulfate container (203) is connected with the second valve (202) through a pipeline, the second valve (202) is connected with the settling tank (201) through a pipeline, the sodium hydroxide container (204) is connected with the third valve (205) through a pipeline, the third valve (205) is connected with the settling tank (201) through a pipeline, one end of the fourth valve (206) is connected with a water inlet of the settling tank (201) through a pipeline, and the other end of the fourth valve (206) is connected with the water inlet pump (12) through a pipeline.
3. The continuous monitor for nitrate nitrogen in water as claimed in claim 2, wherein: an aluminum sulfate container (203) in the pretreatment device (2) is filled with an aluminum sulfate solution with the concentration of 180 g/L.
4. The continuous monitor for nitrate nitrogen in water as claimed in claim 2, wherein: the sodium hydroxide container (204) in the pretreatment device (2) is filled with a sodium hydroxide solution with the concentration of 500 g/L.
5. The continuous monitor for nitrate nitrogen in water as claimed in claim 1, wherein: the buffer solution container (5) is filled with buffer solution with the pH value of 2-4.
6. A method of operating a continuous monitor for nitrate nitrogen in water, comprising: comprises the following steps:
the method comprises the following steps: a water sample to be detected is extracted through a water inlet pipe (1) by a water inlet pump (12) and is conveyed into a settling tank (201) in the pretreatment device (2);
step two: adding an aluminum sulfate solution with the concentration of 180g/L in an aluminum sulfate container (203) and a sodium hydroxide solution with the concentration of 500g/L in a sodium hydroxide container (204) into a settling tank (201) to generate aluminum hydroxide colloid for adsorption and settlement, and eliminating the interference of suspended impurities and most metal ions in a sample;
step three: pretreating a water sample, standing for 5min, and pumping 50mL of supernatant into a mixing tank (7) through a supernatant collector (207) by a peristaltic pump (11);
step three: 2mL of buffer solution in a buffer solution container (5) is added into a mixing tank (7), and a potential value E is recorded when the degree of the ion activity meter is stable;
step four: the corresponding nitrate concentration is obtained from the working curve according to the potential value E.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117969629A (en) * | 2024-04-02 | 2024-05-03 | 四川省疾病预防控制中心(四川省预防医学科学研究院四川省卫生监测检验中心) | System and method for detecting physiological index |
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| CN211955307U (en) * | 2019-12-31 | 2020-11-17 | 常州市深水城北污水处理有限公司 | Continuous monitor for nitrate nitrogen in water |
-
2019
- 2019-12-31 CN CN201911422835.5A patent/CN111024794B/en active Active
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| GB2013339A (en) * | 1978-01-27 | 1979-08-08 | Sumitomo Chemical Co | Method and apparatus for the determination of nitrates or nitrates in aqueous solutions |
| CN203688493U (en) * | 2013-12-17 | 2014-07-02 | 中兴仪器（深圳）有限公司 | On-line multi-parameter heavy metal analyzer |
| US20150260701A1 (en) * | 2014-03-17 | 2015-09-17 | Sichuan University | Method and apparatus for simultaneous online assay of nitrites and nitrates in water samples |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117969629A (en) * | 2024-04-02 | 2024-05-03 | 四川省疾病预防控制中心(四川省预防医学科学研究院四川省卫生监测检验中心) | System and method for detecting physiological index |
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