CN107340249A - A kind of method of total nitrogen content in on-line checking environmental water sample - Google Patents
A kind of method of total nitrogen content in on-line checking environmental water sample Download PDFInfo
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Abstract
The invention discloses a kind of method of total nitrogen content in on-line checking environmental water sample, agent prescription is simple, and can suitably adjust ratio and addition according to actual use situation, method is stable, and linear and repeatability is preferable, and the degree of accuracy is high, recovery of standard addition meets requirement, and small by other factors interference.This method is applied in monitoring water quality on line apparatus field, there is high practical value, method is simple, workable, suitable for the demand of monitoring water quality on line industry.
Description
Technical field
The invention belongs to analytical chemistry field, is related to the technical field of nitrite ion detection, especially relates to ring
The method of the on-line checking total nitrogen content of border water sample and contaminating enterprises' waste discharge.
Background technology
Total nitrogen refers in water that various forms are inorganic and the total amount of organic nitrogen.Including：Nitrate anion (NO3 -), nitrite anions
(NO2 -) and ammonia nitrogen (NH4 +) etc. the organic nitrogen such as inorganic nitrogen and protein, amino acid and organic amine, be used to represent water body by
The degree of nutriment pollution.Total nitrogen in water is one of important indicator for weighing water quality, and it, which is determined, helps to evaluate water body quilt
Pollution and self-cleaning situation.There is the assay method of total nitrogen in water：Alkaline chitinase ultraviolet spectrophotometry, gas molecule in space absorb light
Spectrometry and the content measurement result that then result adds up as total nitrogen for determining ammonia nitrogen, nitrate anion, nitrite anions respectively.There is document
Report uses hydrochloride naphthodiamide spectrophotometry total nitrogen, and its reducing medium used is cadmium post, and simply applies in reality
Test the content of total nitrogen in the manual inspection water sample of room.It yet there are no report and use copper sulphate and zinc sulfate as mixed catalyst, with sulphur
Sour hydrazine detects the content of total nitrogen in water sample for the method for reducing agent.Present invention is generally directed to the online inspection of total nitrogen in environmental water sample
Survey, there is provided a kind of method of convenient, fast, simple, repeated preferably on-line checking total nitrogen.This method versatility is stronger,
Water sample and reagent additional proportion are suitably adjusted according to on-site actual situations, can accurately determine the rings such as pollutant discharge of enterprise, surface water
The content of total nitrogen in the water sample of border.
The content of the invention
It is an object of the invention to provide a kind of method of total nitrogen content in on-line checking environmental water sample, this method is by environment
The nitrogen-containing compounds such as the nitrate anion that contains in water sample, nitrite anions, ammonia nitrogen, organic nitrogen use high-temperature closed to clear up for nitrate anion,
Then in the presence of special catalyst, nitrate anion is reduced to nitrite anions, after adding developer progress chromogenic reaction, in wavelength
Colorimetric measurement is carried out at 540nm, is calculated according to the standard curve that nitrite anions reacts to obtain with developer, finally obtains water
Total nitrogen content in sample.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of method of total nitrogen content in on-line checking environmental water sample, it is characterised in that：Comprise the following steps：
(1) preparation of nitrite ion standard liquid：
The nitrite anions NO that concentration is 1000 μ g/ml is accurately pipetted respectively2 -Standard liquid 0.1ml, 0.5ml, 1.0ml,
2.0ml is placed in 1000ml volumetric flasks, and scale is settled to ultra-pure water, that is, respectively obtain concentration for 0.1mg/L, 0.5mg/L,
1.0mg/L, 2.0mg/L nitrite anions standard liquid；
(2) preparation of environmental water sample to be measured：
The water sample containing suspension fetched is stood overnight, takes supernatant to measure；
(3) preparation of environmental water sample mark-on solution to be measured：
It is accurate to pipette the nitrite anions NO that concentration is 1000 μ g/ml2 -Standard liquid 0.5ml is added to 1000ml volumetric flask
In, the supernatant after then being stood with water sample to be measured is diluted surely molten, and the mark-on for obtaining water sample mark-on 0.5mg/L to be measured is molten
Liquid；
(4) preparation of oxidant
A, accurately 9.5g sodium tetraborates are weighed to be dissolved in about 100ml pure water；
B, accurately 15.0g potassium peroxydisulfates are weighed to be dissolved in about 100ml pure water；
C, accurately 7.5g sodium hydroxides are weighed to be dissolved in about 100ml pure water；
Then above-mentioned a, b and c solution is mixed, be poured into after stirring in 500ml volumetric flasks, and burning is cleaned with pure water
Cup, cleaning fluid are poured into volumetric flask, are finally settled to scale with pure water, you can obtain oxidant；
(5) preparation of catalytic reducer
A, accurately 1.5g hydrazine sulfates are weighed to be dissolved in about 100ml pure water；
B, accurately 0.0080g copper sulphate is weighed to be dissolved in about 100ml pure water；
C, accurately 0.0161g zinc sulfate is weighed to be dissolved in about 100ml pure water；
Then above-mentioned a, b and c solution is mixed, be poured into after stirring in 500ml volumetric flasks, and burning is cleaned with pure water
Cup, cleaning fluid are poured into volumetric flask, are finally settled to scale with pure water, you can obtain catalytic reducer；
(6) preparation of developer
A, accurately 40.0ml phosphoric acid is measured to be dissolved in about 200ml pure water；
B, accurately 5.0g sulfanilamide (SN) is weighed to be dissolved in about 100ml pure water；
C, accurately 0.5g hydrochloride naphthodiamides are weighed to be dissolved in about 100ml pure water；
Then above-mentioned b and c resulting solutions are mixed, poured into after stirring in a, 500ml appearances are poured into after stirring
In measuring bottle, and beaker is cleaned with pure water, cleaning fluid is poured into volumetric flask, is finally settled to scale with pure water, you can is shown
Toner；
(7) the standard liquid 4.4ml that concentration is 0.1mg/L, 0.5mg/L, 1.0mg/L, 2.0mg/L is taken respectively, is added successively
Enter oxidant, catalytic reducer and each 1.1ml of developer, reaction 5min is stood after shaking up, colorimetric survey is carried out at wavelength 540nm
Amount, the relation fit standard curve according to absorbance and concentration；
(8) nitrogen-containing compound in environmental water sample to be measured mixes with oxidant, in high-temperature closed environment oxidation resolution into
Nitrate anion；After the completion of oxidation resolution, normal temperature is cooled to, adds catalytic reducer, the reducing nitrate radical that resolution is obtained is nitrous
Acid group；Then developer is added, bubbling stands reaction 5min after mixing, colorimetric measurement is carried out at wavelength 540nm and obtains extinction
Degree, the content of total nitrogen in environmental water sample is calculated according to standard curve；
(9) nitrogen-containing compound such as the nitrate anion in environmental water sample mark-on solution to be measured, nitrite anions, ammonia nitrogen, organic nitrogen with
And the nitrite anions standard liquid added mixes with oxidant, resolution is aoxidized in high-temperature closed environment into nitrate anion；Oxidation disappears
After the completion of solution, normal temperature is cooled to, adds catalytic reducer, the reducing nitrate radical that resolution is obtained is nitrite anions；Then add
Developer, bubbling stand reaction 5min after mixing, colorimetric measurement is carried out at wavelength 540nm and obtains absorbance, bent according to standard
Line computation obtains the content of the total nitrogen in environmental water sample mark-on solution.
Described pure water nitrogen content is 0.0004~0.0006%.
A kind of method of total nitrogen content in on-line checking environmental water sample, it is characterised in that：
Comprise the following steps：
(1) preparation of nitrite ion standard liquid：
It is accurate to pipette the nitrite anions (NO that concentration is 1000 μ g/ml2 -) standard liquid 0.1ml, 0.5ml, 1.0ml, 2.0ml
It is placed in 1000ml volumetric flasks, scale is settled to ultra-pure water, that is, it is 0.1mg/L, 0.5mg/L, 1.0mg/ to respectively obtain concentration
L, 2.0mg/L nitrite anions standard liquid.
(2) preparation of environmental water sample to be measured：
The water sample (sewage treatment plant outlet) containing suspension fetched is stood overnight, takes supernatant to measure.
(3) preparation of environmental water sample mark-on solution to be measured：
It is accurate to pipette the nitrite anions (NO that concentration is 1000 μ g/ml2 -) standard liquid 0.5ml added to 1000ml capacity
In bottle, the supernatant after then being stood with water sample to be measured (sewage treatment plant outlet) is diluted constant volume, obtains ambient water to be measured
Sample mark-on 0.5mg/L mark-on solution.
(4) preparation of oxidant
A, accurately 9.5g sodium tetraborates are weighed to be dissolved in about 100ml pure water；
B, the accurate 15.0g potassium peroxydisulfates that weigh are dissolved in about 100ml pure water that (low nitrogen, nitrogen content is less than 0.0005%)；
C, the accurate 7.5g sodium hydroxides that weigh are dissolved in about 100ml pure water (nitrogen content is less than 0.0005%)；
Then above-mentioned a, b and c solution is mixed, be poured into after stirring in 500ml volumetric flasks, and burning is cleaned with pure water
Cup, cleaning fluid are poured into volumetric flask, are finally settled to scale with pure water, you can obtain oxidant.
(5) preparation of catalytic reducer
A, accurately 1.5g hydrazine sulfates are weighed to be dissolved in about 100ml pure water；
B, accurately 0.0080g copper sulphate is weighed to be dissolved in about 100ml pure water；
C, accurately 0.0161g zinc sulfate is weighed to be dissolved in about 100ml pure water；
Then above-mentioned a, b and c solution is mixed, be poured into after stirring in 500ml volumetric flasks, and burning is cleaned with pure water
Cup, cleaning fluid are poured into volumetric flask, are finally settled to scale with pure water, you can obtain catalytic reducer.
(6) preparation of developer
A, accurately 40ml phosphoric acid is measured to be dissolved in about 200ml pure water；
B, accurately 5.0g sulfanilamide (SN) is weighed to be dissolved in about 100ml pure water；
C, accurately 0.5g hydrochloride naphthodiamides are weighed to be dissolved in about 100ml pure water；
Then above-mentioned b and c solution is mixed, is poured into after stirring in a, 500ml volumetric flasks are poured into after stirring
In, and beaker is cleaned with pure water, cleaning fluid is poured into volumetric flask, is finally settled to scale with pure water, you can obtains developer.
The method of total nitrogen content in a kind of described on-line checking environmental water sample, it is characterised in that：The concentration is taken to be respectively
0.1mg/L, 0.5mg/L, 1.0mg/L, 2.0mg/L nitrite anions standard liquid 4.4ml, sequentially add oxidant, catalysis also
Former agent and each 1.1ml of developer, after shaking up stand reaction 5min, wavelength 540nm at carry out colorimetric measurement, according to absorbance with
The relation fit standard curve of concentration.
The method of total nitrogen content in a kind of described on-line checking environmental water sample, it is characterised in that：Environmental water sample inspection to be measured
When surveying with environmental water sample mark-on solution to be measured detection, water sample and each reagent additional proportion are as follows：Water sample addition：4.4ml；Oxidation
Agent addition：1.1ml；Pyroreaction：130 DEG C, 15min；Catalytic reducer addition：1.1ml；Developer addition：
1.1ml。
The method of total nitrogen content in a kind of described on-line checking environmental water sample, it is characterised in that：In environmental water sample to be measured
Nitrate anion, nitrite anions, ammonia nitrogen, the nitrogen-containing compound such as organic nitrogen mixed with oxidant, aoxidize and disappear in high-temperature closed environment
Solution is into nitrate anion；After the completion of oxidation resolution, normal temperature is cooled to, adds catalytic reducer, is by the reducing nitrate radical that resolution obtains
Nitrite anions；Then developer is added, bubbling stands reaction 5min after mixing, colorimetric measurement is carried out at wavelength 540nm and is obtained
Absorbance, the content of total nitrogen in environmental water sample to be measured is calculated according to standard curve；
The method of total nitrogen content in a kind of described on-line checking environmental water sample, it is characterised in that：Environmental water sample to be measured adds
Mark nitrate anion, nitrite anions, ammonia nitrogen, the nitrogen-containing compound such as organic nitrogen and the nitrite anions standard liquid of addition in solution with
Oxidant is mixed, and resolution is aoxidized in high-temperature closed environment into nitrate anion；After the completion of oxidation resolution, normal temperature is cooled to, addition is urged
Change reducing agent, the reducing nitrate radical that resolution is obtained is nitrite anions；Then developer is added, bubbling stands reaction after mixing
5min, progress colorimetric measurement obtains absorbance at wavelength 540nm, and environmental water sample mark-on to be measured is calculated according to standard curve
The content of total nitrogen in solution；
Beneficial effects of the present invention are：
Present invention seek to address that in a kind of on-line checking environmental water sample total nitrogen content method, this method uses alkaline over cure
Sour potassium high-temperature oxydation resolution, then in the presence of copper sulphate and zinc sulfate mixed catalyst, is reduced, then in acidity by hydrazine sulfate
In medium, chromogenic reaction, the final mark for reacting to obtain according to nitrite anions and developer occurs with sulfanilamide (SN) and hydrochloride naphthodiamide
Directrix curve is calculated, and finally obtains the total nitrogen content in water sample.Whole course of reaction is simple, quick and repeated preferable, adds
It is 102.4% to mark the rate of recovery.This method tests total nitrogen content water sample suitable for laboratory, while to prepare monitoring water quality on line
Equipment is used for total nitrogen content in on-line checking water sample and more there is provided good Method And Principle.
Brief description of the drawings
Fig. 1 is the relation fit standard curve of absorbance and concentration.
Embodiment
The present invention can be explained in more detail by the following examples：
1st, the preparation of standard liquid and environmental water sample and environmental water sample mark-on solution：
(1) preparation of nitrite ion standard liquid：
It is accurate to pipette the nitrite anions (NO that concentration is 1000 μ g/ml2 -) standard liquid 0.1ml, 0.5ml, 1.0ml, 2.0ml
It is placed in 1000ml volumetric flasks, scale is settled to ultra-pure water, that is, it is 0.1mg/L, 0.5mg/L, 1.0mg/ to respectively obtain concentration
L, 2.0mg/L nitrite anions standard liquid.
(2) preparation of nitrate ion standard liquid：
It is accurate to pipette the nitrate anion (NO that concentration is 1000 μ g/ml3 -) standard liquid 0.5ml, 1.0ml be placed in 1000ml capacity
Bottle in, be settled to scale with ultra-pure water, that is, respectively obtain concentration for 0.5mg/L, 1.0mg/L, nitrate anion standard liquid.
(3) preparation of environmental water sample to be measured：
The water sample (sewage treatment plant outlet) containing suspension fetched is stood overnight, takes supernatant to measure.
(4) preparation of environmental water sample mark-on solution to be measured：
It is accurate to pipette the nitrite anions (NO that concentration is 1000 μ g/ml2 -) standard liquid 0.5ml added to 1000ml capacity
In bottle, the supernatant after then being stood with water sample to be measured (sewage treatment plant outlet) is diluted constant volume, obtains water sample to be measured and adds
Mark 0.5mg/L mark-on solution.
2nd, the preparation of reagent：
(1) preparation of oxidant
A, accurately 9.5g sodium tetraborates are weighed to be dissolved in about 100ml pure water；
B, the accurate 15.0g potassium peroxydisulfates that weigh are dissolved in about 100ml pure water that (low nitrogen, nitrogen content is less than 0.0005%)；
C, the accurate 7.5g sodium hydroxides that weigh are dissolved in about 100ml pure water (nitrogen content is less than 0.0005%)；
Then above-mentioned a, b and c solution is mixed, be poured into after stirring in 500ml volumetric flasks, and burning is cleaned with pure water
Cup, cleaning fluid are poured into volumetric flask, are finally settled to scale with pure water, you can obtain oxidant.
(2) preparation of catalytic reducer
A, accurately 1.5g hydrazine sulfates are weighed to be dissolved in about 100ml pure water；
B, accurately 0.0080g copper sulphate is weighed to be dissolved in about 100ml pure water；
C, accurately 0.0161g zinc sulfate is weighed to be dissolved in about 100ml pure water；
Then above-mentioned a, b and c solution is mixed, be poured into after stirring in 500ml volumetric flasks, and burning is cleaned with pure water
Cup, cleaning fluid are poured into volumetric flask, are finally settled to scale with pure water, you can obtain catalytic reducer.
(3) preparation of developer
A, accurately 40ml phosphoric acid is measured to be dissolved in about 200ml pure water；
B, accurately 5.0g sulfanilamide (SN) is weighed to be dissolved in about 100ml pure water；
C, accurately 0.5g hydrochloride naphthodiamides are weighed to be dissolved in about 100ml pure water；
Then above-mentioned b and c solution is mixed, is poured into after stirring in a, 500ml volumetric flasks are poured into after stirring
In, and beaker is cleaned with pure water, cleaning fluid is poured into volumetric flask, is finally settled to scale with pure water, you can obtains developer.
3rd, the drafting of standard curve
The nitrite anions standard liquid 4.4ml that concentration is 0.1mg/L, 0.5mg/L, 1.0mg/L, 2.0mg/L is taken respectively, according to
Secondary addition oxidant, catalytic reducer and each 1.1ml of developer, stand reaction 5min, are compared at wavelength 540nm after shaking up
Color measures, the relation fit standard curve according to absorbance and concentration.Such as table 1 and Fig. 1.
4th, the test of nitrate ion standard liquid, environmental water sample and environmental water sample mark-on solution
Nitrate ion standard liquid, water sample and each reagent additional proportion and detection mode are as follows：
(1) nitrate ion standard liquid or environmental water sample addition：4.4ml；
(2) oxidant addition：1.1ml；
(3) pyroreaction：130 DEG C, 15min；
(4) catalytic reducer addition：1.1ml；
(5) developer addition：1.1ml；
Nitrate ion standard liquid or environmental water sample and environmental water sample mark-on solution mix with oxidant, in high-temperature closed
Oxidation resolution in environment, after the completion of oxidation resolution, normal temperature is cooled to, adds catalytic reducer, the nitrate anion that resolution is obtained is also
Originally it was nitrite anions；Then developer is added, bubbling stands reaction 5min, colorimetric measurement is carried out at wavelength 540nm after mixing
Absorbance is obtained, the content of total nitrogen in environmental water sample to be measured is calculated according to standard curve.Measurement result is shown in Table 2：
5th, reperformance test
6 parts of nitrate ion standard liquids (1.0mg/L) and environmental water sample to be measured are taken respectively, are labeled as：A1、A2、A3、
A4, A5, A6 and B1, B2, B3, B4, B5, B6, after being separately added into oxidant mixing, resolution, oxygen are aoxidized in high-temperature closed environment
After the completion of changing resolution, normal temperature is cooled to, adds catalytic reducer, the reducing nitrate radical that resolution is obtained is nitrite anions；Then
Developer is added, bubbling stands reaction 5min after mixing, colorimetric measurement is carried out at wavelength 540nm and obtains absorbance, according to mark
Directrix curve calculates the concentration of total nitrogen in environmental water sample to be measured.Measurement result such as table 3 and table 4：
Table 1 (nitrite ion concentration and absorbance relation)
Table 2 (nitrate anion standard liquid and environmental water sample and environmental water sample mark-on test table)
Table 3 (reperformance test of nitrate ion standard liquid)
Table 4 (environmental water sample reperformance test)
Claims (3)
1. a kind of method of total nitrogen content in on-line checking environmental water sample, it is characterised in that：Comprise the following steps：
（1）The preparation of nitrite ion standard liquid：
The nitrite anions NO that concentration is 1000 μ g/ml is accurately pipetted respectively2 -Standard liquid 0.1ml, 0.5ml, 1.0ml, 2.0ml are put
In 1000ml volumetric flasks, scale is settled to ultra-pure water, that is, respectively obtains concentration as 0.1mg/L, 0.5 mg/L, 1.0 mg/
L, 2.0 mg/L nitrite anions standard liquid；
（2）The preparation of environmental water sample to be measured：
The water sample containing suspension fetched is stood overnight, takes supernatant to measure；
（3）The preparation of environmental water sample mark-on solution to be measured：
It is accurate to pipette the nitrite anions NO that concentration is 1000 μ g/ml2 -Standard liquid 0.5ml is added into 1000ml volumetric flask,
Then the supernatant after being stood with water sample to be measured is diluted surely molten, obtains water sample mark-on 0.5mg/L to be measured mark-on solution；
（4）The preparation of oxidant
A, accurately 9.5g sodium tetraborates are weighed to be dissolved in about 100ml pure water；
B, accurately 15.0g potassium peroxydisulfates are weighed to be dissolved in about 100ml pure water；
C, accurately 7.5g sodium hydroxides are weighed to be dissolved in about 100ml pure water；
Then above-mentioned a, b and c solution is mixed, is poured into after stirring in 500ml volumetric flasks, and beaker is cleaned with pure water,
Cleaning fluid is poured into volumetric flask, is finally settled to scale with pure water, you can obtains oxidant；
（5）The preparation of catalytic reducer
A, accurately 1.5g hydrazine sulfates are weighed to be dissolved in about 100ml pure water；
B, accurately 0.0080g copper sulphate is weighed to be dissolved in about 100ml pure water；
C, accurately 0.0161g zinc sulfate is weighed to be dissolved in about 100ml pure water；
Then above-mentioned a, b and c solution is mixed, is poured into after stirring in 500ml volumetric flasks, and beaker is cleaned with pure water,
Cleaning fluid is poured into volumetric flask, is finally settled to scale with pure water, you can obtains catalytic reducer；
（6）The preparation of developer
A, accurately 40.0ml phosphoric acid is measured to be dissolved in about 200ml pure water；
B, accurately 5.0g sulfanilamide (SN) is weighed to be dissolved in about 100ml pure water；
C, accurately 0.5g hydrochloride naphthodiamides are weighed to be dissolved in about 100ml pure water；
Then above-mentioned b and c resulting solutions are mixed, is poured into after stirring in a, 500ml volumetric flasks are poured into after stirring
In, and beaker is cleaned with pure water, cleaning fluid is poured into volumetric flask, is finally settled to scale with pure water, you can obtains developer；
（7）Concentration is taken to be sequentially added for 0.1mg/L, 0.5 mg/L, 1.0 mg/L, 2.0 mg/L standard liquid 4.4ml respectively
Oxidant, catalytic reducer and each 1.1ml of developer, reaction 5min is stood after shaking up, colorimetric survey is carried out at wavelength 540nm
Amount, the relation fit standard curve according to absorbance and concentration；
（8）Nitrogen-containing compound in environmental water sample to be measured is mixed with oxidant, and resolution is aoxidized in high-temperature closed environment into nitric acid
Root；After the completion of oxidation resolution, normal temperature is cooled to, adds catalytic reducer, the reducing nitrate radical that resolution is obtained is nitrite anions；
Then developer is added, bubbling stands reaction 5min after mixing, colorimetric measurement is carried out at wavelength 540nm and obtains absorbance, root
The content of total nitrogen in environmental water sample is calculated according to standard curve；
（9）The nitrogen-containing compounds such as nitrate anion, nitrite anions, ammonia nitrogen, organic nitrogen in environmental water sample mark-on solution to be measured and add
The nitrite anions standard liquid entered is mixed with oxidant, and resolution is aoxidized in high-temperature closed environment into nitrate anion；Oxidation has been cleared up
Cheng Hou, normal temperature is cooled to, adds catalytic reducer, the reducing nitrate radical that resolution is obtained is nitrite anions；Then colour developing is added
Agent, bubbling stand reaction 5min after mixing, colorimetric measurement is carried out at wavelength 540nm and obtains absorbance, according to standard curve meter
Calculate the content of the total nitrogen obtained in environmental water sample mark-on solution.
2. the method for total nitrogen content in a kind of on-line checking environmental water sample according to claims 1, it is characterised in that：Treat
When surveying environmental water sample detection and environmental water sample mark-on solution to be measured detection, water sample and each reagent additional proportion are as follows：Water sample adds
Amount：4.4ml；Oxidant addition：1.1ml；Pyroreaction：130 DEG C, 15min；
Catalytic reducer addition：1.1ml；Developer addition：1.1ml.
3. the method for total nitrogen content in a kind of on-line checking environmental water sample according to claims 1, it is characterised in that：Institute
The pure water nitrogen content stated is 0.0004 ~ 0.0006%.
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| CN107843585A (en) * | 2017-11-22 | 2018-03-27 | 安徽皖仪科技股份有限公司 | The novel detection method of total chrome content in a kind of environmental water sample of anti-various metals ion interference |
| CN108801955A (en) * | 2018-07-04 | 2018-11-13 | 无锡天创伟业科技有限公司 | A kind of resorcinol spectrophotometry for total nitrogen test |
| CN108982388A (en) * | 2018-08-31 | 2018-12-11 | 青岛卓建海洋装备科技有限公司 | The test method of seawater total nitrogen content |
| CN109975285A (en) * | 2019-04-17 | 2019-07-05 | 成都虹波钼业有限责任公司 | The detection method of nitrate anion in a kind of molybdenum base sample |
| CN112683823A (en) * | 2020-12-17 | 2021-04-20 | 飞鸣科学仪器（武汉）有限公司 | Detection reagent for detecting total nitrogen content in wastewater and preparation method |
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| CN114207424A (en) * | 2019-07-16 | 2022-03-18 | 日本特殊陶业株式会社 | Water quality measuring system |
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| CN109975285A (en) * | 2019-04-17 | 2019-07-05 | 成都虹波钼业有限责任公司 | The detection method of nitrate anion in a kind of molybdenum base sample |
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| CN113655012A (en) * | 2020-05-12 | 2021-11-16 | 华奇（中国）化工有限公司 | high-COD (chemical oxygen demand) wastewater total nitrogen testing method |
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Application publication date: 20171110 |