CN109521007A - A kind of Quantitative Monitoring method of ammonia nitrogen in waste water - Google Patents
A kind of Quantitative Monitoring method of ammonia nitrogen in waste water Download PDFInfo
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Abstract
The invention discloses a kind of Quantitative Monitoring methods of ammonia nitrogen in waste water, method includes the following steps: the Ammonia nitrogen standard liquid of configuration various concentration, is added sodium hydroxide solution, bigcatkin willow acid reagent, cyanuric acid reagent and obtains ammonia nitrogen standard coloration liquid, make standard curve；Take two colorimetric cylinders, waste water, sodium hydroxide solution, bigcatkin willow acid reagent and cyanuric acid reagent to be measured are added in a colorimetric cylinder, prepare liquid is obtained, is added in another colorimetric cylinder without ammonium hydroxide, sodium hydroxide solution, bigcatkin willow acid reagent and cyanuric acid reagent, obtains blank sample；Prepare liquid and blank sample are stood into certain time；The absorbance for measuring prepare liquid, is returned to zero with blank sample, calculates the ammonia-nitrogen content in waste water to be measured according to the standard curve of production.This method has higher determination of the upper limit and shorter reaction time compared with environment protectment protection, is improved the practicability of traditional salicylic acid method.
Description
Technical field
The present invention relates to ammonia nitrogen quantitative analysis tech fields, it particularly relates in a kind of waste water ammonia nitrogen Quantitative Monitoring
Method.
Background technique
According to national " sewage discharge comprehensive standard " regulation, all pollutant discharging units want ammonia-nitrogen content in sewage discharge
It asks, wherein the ammonia nitrogen primary standard of industrial wastewater is 15mg/L, secondary standard 50mg/L.The main source of ammonia nitrogen is in waste water
Itrogenous organic substance when ammonia-nitrogen content is higher, is presented toxic action to fish, also had to human body by the decomposition product of microbial action
Different degrees of harm.It tends towards stability in national economic development, greatly develops the period of Ecological Civilization Construction, strict control waste water
The concentration of middle pollutant is the important duty of each department, each enterprise.
Need to use gelatin in traditional copper foil electrolysis production, main component is the average molecular matter being made of amino acid
Amount is distributed very wide peptide molecule mixture, can be effectively reduced the roughness of copper foil.Such itrogenous organic substance is passing through
Ammonia-nitrogen content after multiple chemical reaction and microbial degradation in meeting significant increase water quality.Meanwhile the dedicated copper foil of lithium battery
The additive used in production, laboratory sewage discharge also result in the promotion of ammonia nitrogen amount in waste water.If untreated, waste water
The content of ammonia nitrogen may have chemical oxidization method, blow-off method, zeolite deamination method in dozens to hundreds of ppm, common processing method, this
If not making effective monitoring in a little methods, the processing difficulty of ammonia nitrogen waste water can be greatly increased when its content fluctuates larger, is caused
Waste water is accumulative, and severe jamming water process process is normally carried out.
Summary of the invention
For above-mentioned technical problem in the related technology, the present invention proposes a kind of Quantitative Monitoring method of ammonia nitrogen in waste water,
The above-mentioned deficiency of the prior art can be overcome.
To realize the above-mentioned technical purpose, the technical scheme of the present invention is realized as follows:
A kind of Quantitative Monitoring method of ammonia nitrogen in waste water, method includes the following steps:
(1) the ammonia nitrogen standard reagent of different volumes is separately added into 4 volumetric flasks, constant volume simultaneously shakes up, and obtains different dense
(the ammonia nitrogen standard reagent is national non-ferrous metal and the production of electronic material Institute of Analysis to the Ammonia nitrogen standard liquid of degree
1000mg/L ammonia nitrogen standard reagent can be prepared with analytically pure ammonium chloride and be replaced)；
(2) be separately added into 4 colorimetric cylinders the Ammonia nitrogen standard liquid of various concentration, a certain amount of sodium hydroxide solution,
Bigcatkin willow acid reagent, cyanuric acid reagent, are diluted with water to scale and shake up, and obtain the ammonia nitrogen standard coloration liquid of various concentration, stand
Certain time, using water as reference, measured on spectrophotometer with unicast regular way obtained by ammonia nitrogen standard coloration liquid in 655nm wavelength
Under absorbance, absorbance-concentration values is inputted into instrument, carries out linear fit, obtains standard curve；
(3) two colorimetric cylinders are taken, a certain amount of waste water to be measured, sodium hydroxide solution, bigcatkin willow are added in a colorimetric cylinder
Acid reagent and cyanuric acid reagent, are diluted with water to scale and shake up, obtain prepare liquid, in another colorimetric cylinder be added with it is to be measured
In liquid waste water equivalent to be measured without ammonium hydroxide, sodium hydroxide solution, bigcatkin willow acid reagent and cyanuric acid reagent, be diluted with water to scale simultaneously
It shakes up, obtains blank sample；
(4) prepare liquid and blank sample are stood into certain time；
(5) measure prepare liquid absorbance, returned to zero with blank sample, according to step (2) production standard curve calculate to
Survey the ammonia-nitrogen content in waste water.
Further, the ammonia nitrogen standard coloration solution is respectively containing the ammonia nitrogen of 5ppm, 10ppm, 20ppm, 40ppm.
Further, the salicylic acid agent formulations are the bigcatkin willow of the sodium nitroprusside of 0.95wt%, 44.2wt%
Sour sodium, the trinitrophenol of 0.25wt%, the sodium citrate of 42wt%, 12.6wt% sodium tartrate.
Further, the cyanuric acid agent formulations be the lithium hydroxide of 2wt%, 3wt% sodium dichloro cyanurate,
The sodium tartrate of the sodium citrate of 85wt%, 10wt%.
Further, the concentration of the sodium hydroxide solution is 1wt%, and the addition volume of sodium hydroxide solution is
5.0mL。
Further, the salicylic acid reagent dosage is 0.80g, and cyanuric acid reagent dosage is 0.50g.
Further, the additional amount of Ammonia nitrogen standard liquid described in step (2) is 0.20mL, to be measured described in step (3)
The additional amount of waste water is 0.20mL.
Further, the time of repose of the standard coloration liquid, prepare liquid and blank sample is 20 minutes.
Further, the colorimetric cylinder specification is 10mL.
Further, correction coefficient of determination >=0.99 of the standard curve.
Further, the sodium salicylate, trinitrophenol, sodium citrate, sodium dichloro cyanurate, sodium tartrate, Asia
The nitro sodium ferricyanide and sodium hydroxide are that analysis is pure, and the no ammonium hydroxide can be replaced with ultrapure water.
Beneficial effects of the present invention: the Quantitative Monitoring method and environment protectment protection of ammonia nitrogen in waste water of the invention
(HJ536-2009) it compares, there is higher determination of the upper limit and shorter reaction time, eliminate actually detected dilution,
It is to improve the practicability of traditional salicylic acid method.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the standard curve of 1 resulting absorbance and ammonia-nitrogen content of the embodiment of the present invention；
Fig. 2 is the standard curve of 2 resulting absorbance and ammonia-nitrogen content of the embodiment of the present invention；
Fig. 3 is the standard curve of 3 resulting absorbance and ammonia-nitrogen content of the embodiment of the present invention；
Fig. 4 is the standard curve of 1 resulting absorbance and ammonia-nitrogen content of comparative example.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art's every other embodiment obtained belong to what the present invention protected
Range.
Preparing experiment 1: the preparation of sodium hydroxide solution
1.00 grams of sodium hydroxide are weighed in small beaker, is added on a small quantity without ammonia solvent, is stirred evenly, be transferred to 1000mL
Volumetric flask in, constant volume is made into sodium hydroxide solution.
Preparing experiment 2: the preparation of ammonia nitrogen standard reagent
1.9107g ammonium chloride is weighed in small beaker, is added and stirs without ammonium hydroxide to abundant dissolution, be transferred to 500mL capacity
In bottle, it is diluted to scale with no ammonium hydroxide, constant volume simultaneously shakes up, and is made into the ammonium chloride standard solution of 0.07143mol/L to get ammonia is arrived
Nitrogen content is the ammonia nitrogen standard reagent of 1000ppm.
Embodiment 1
The volumetric flask for taking four 50mL, is separately added into the 1000ppm ammonia nitrogen standard reagent of different volumes, and additional amount is respectively
0.25mL, 0.50mL, 1.00mL, 2.00mL, constant volume simultaneously shake up, and obtain the Ammonia nitrogen standard liquid of various concentration.
The Ammonia nitrogen standard liquid 0.20mL for pipetting above-mentioned four kinds of various concentrations respectively with pipette, is separately added into 10mL colorimetric
Pipe is added bigcatkin willow acid reagent 0.80g, cyanuric acid reagent 0.50g, sodium hydroxide solution 5.0mL, is diluted with water to 10mL scale,
It shakes up, obtains the ammonia nitrogen standard coloration liquid of various concentration.
Stand colour developing 20 minutes, with unicast regular way on spectrophotometer respectively using water as each standard coloration liquid of reference measurement
Absorbance-concentration values are inputted instrument, carry out linear fit, obtain standard curve by the absorbance under 655nm wavelength.It obtains
The standard curve obtained is as shown in Figure 1, curvature correction coefficient of determination is 0.9997, and linear relationship is fine, and description standard curve is to close
Lattice.
Waste water to be measured is derived from comprehensive sedimentation basin, takes waste water 0.20mL with pipette, 10mL colorimetric cylinder is added, salicylic acid is added
Reagent 0.80g, cyanuric acid reagent 0.50g, sodium hydroxide solution 5.0mL, are diluted with water to scale, shake up, as prepare liquid.
No ammonium hydroxide 0.20mL is taken with pipette, 10mL colorimetric cylinder is added, bigcatkin willow acid reagent 0.80g cyanuric acid reagent is added
0.50g, sodium hydroxide solution 5.0mL, is diluted with water to scale, shakes up, as blank sample.
Prepare liquid and blank sample are stood 20 minutes, sufficiently develops the color, is first zeroed with blank sample, then survey prepare liquid extinction
Degree, reading is 0.167.
Ammonia nitrogen actual content C in waste waterIt is practicalIt can be calculated according to the absorbance A of prepare liquid with following formula:
CIt is practical=38.760*A-3.275
The ammonia-nitrogen content for calculating waste water accordingly is 3.2ppm.
Embodiment 2
The volumetric flask for taking four 50mL, is separately added into the 1000ppm Ammonia nitrogen standard liquid of different volumes, and additional amount is respectively
0.25mL, 0.50mL, 1.00mL, 2.00mL, constant volume simultaneously shake up, and obtain the Ammonia nitrogen standard liquid of various concentration.
The Ammonia nitrogen standard liquid 0.20mL for pipetting above-mentioned four kinds of various concentrations respectively with pipette, is separately added into 10mL colorimetric
Pipe is added bigcatkin willow acid reagent 0.80g, cyanuric acid reagent 0.50g, sodium hydroxide solution 5.0mL, is diluted with water to 10mL scale,
It shakes up, obtains the ammonia nitrogen standard coloration liquid of various concentration.
Stand colour developing 20 minutes, with unicast regular way on spectrophotometer respectively using water as each standard coloration liquid of reference measurement
Absorbance-concentration values are inputted instrument, carry out linear fit, obtain standard curve by the absorbance under 655nm wavelength.It obtains
The standard curve obtained is as shown in Fig. 2, curvature correction coefficient of determination is 0.9997, and linear relationship is fine, and description standard curve is to close
Lattice.
Waste water to be measured is derived from reservoir, takes waste water 0.20mL with pipette, 10mL colorimetric cylinder is added, bigcatkin willow acid reagent is added
0.80g, cyanuric acid reagent 0.50g, sodium hydroxide solution 5.0mL, are diluted with water to scale, shake up, as prepare liquid.
No ammonium hydroxide 0.20mL is taken with pipette, 10mL colorimetric cylinder is added, bigcatkin willow acid reagent 0.80g, cyanuric acid is added
0.50g, sodium hydroxide solution 5.0mL, are diluted with water to scale, shake up, as blank sample.
Prepare liquid and blank sample are stood 20 minutes, sufficiently develops the color, is first zeroed with blank sample, then survey prepare liquid extinction
Degree, reading is 0.126.
Ammonia nitrogen actual content C in waste waterIt is practicalIt can be calculated according to the absorbance A of prepare liquid with following formula:
CIt is practical=38.610*A-3.382
The ammonia-nitrogen content for calculating waste water accordingly is 1.5ppm.
Embodiment 3
The volumetric flask for taking four 50mL, is separately added into the 1000ppm Ammonia nitrogen standard liquid of different volumes, and additional amount is respectively
0.25mL, 0.50mL, 1.00mL, 2.00mL, constant volume simultaneously shake up, and obtain the Ammonia nitrogen standard liquid of various concentration.
The Ammonia nitrogen standard liquid 0.20mL for pipetting above-mentioned four kinds of various concentrations respectively with pipette, is separately added into 10mL colorimetric
Pipe is added bigcatkin willow acid reagent 0.80g, cyanuric acid reagent 0.50g, sodium hydroxide solution 5.0mL, is diluted with water to 10mL scale,
It shakes up, obtains the ammonia nitrogen standard coloration liquid of various concentration.
Stand colour developing 20 minutes, with unicast regular way on spectrophotometer respectively using water as each standard coloration liquid of reference measurement
Absorbance-concentration values are inputted instrument, carry out linear fit, obtain standard curve by the absorbance under 655nm wavelength.It obtains
The standard curve obtained is as shown in figure 3, curvature correction coefficient of determination is 0.9999, and linear relationship is fine, and description standard curve is to close
Lattice.
Waste water to be measured is derived from reservoir, takes waste water 0.20mL with pipette, 10mL colorimetric cylinder is added, bigcatkin willow acid reagent is added
0.80g, cyanuric acid reagent 0.50g, sodium hydroxide solution 5.0mL, are diluted with water to scale, shake up, as prepare liquid.
No ammonium hydroxide 0.20mL is taken with pipette, 10mL colorimetric cylinder is added, bigcatkin willow acid reagent 0.80g, cyanuric acid is added
0.50g, sodium hydroxide solution 5.0mL, are diluted with water to scale, shake up, as blank sample.
Prepare liquid and blank sample are stood 20 minutes, sufficiently develops the color, is first zeroed with blank sample, then survey prepare liquid extinction
Degree, reading is 0.154.
Ammonia nitrogen actual content C in waste waterIt is practicalIt can be calculated according to the absorbance A of prepare liquid with following formula:
CIt is practical=37.879*A-3.621
The ammonia-nitrogen content for calculating waste water accordingly is 2.2ppm.
Comparative example 1
Using ammonia-nitrogen content in national standard salicylic acid method measurement waste water, wherein sodium hypochlorite is that chemistry is pure, and sodium potassium tartrate tetrahydrate is
Analyze pure, remaining reagent is same as above.
50g salicylic acid is weighed, about 100mL water is added, adds 12.8g sodium hydroxide, stirring is allowed to be completely dissolved；Claim again
50g sodium potassium tartrate tetrahydrate is taken, it is soluble in water, merge with above-mentioned solution and move into 1000mL volumetric flask, be diluted with water to graduation mark, makees
For national standard color developing agent.
It weighs sodium hypochlorite and is made into 3.5g/L sodium hypochlorite using liquid.Sodium nitroprusside is weighed, 10g/L nitrous is made into
Base sodium ferricyanide solution.
1000ppm Ammonia nitrogen standard liquid is diluted 1000 times, uses liquid as the ammonia nitrogen that concentration is 1ppm.
Four 10mL colorimetric cylinders are taken, the use of 0.00mL, 1.00mL, 2.00mL, 4.00mL, 8.00mL ammonia nitrogen is separately added into
Liquid is diluted with water to 8mL scale, and 1.00mL color developing agent and 2 drop sodium nitroprusside solution is then added, mixes.2 are instilled again
Drop sodium hypochlorite using liquid and mixes, and is diluted with water to graticule, mixes well, and after the 60min that develops the color, at 697nm wavelength, uses
10mm cuvette, measures absorbance by reference of water, and absorbance-concentration values are inputted instrument, linear fit is carried out, is marked
The standard curve of directrix curve, acquisition is as shown in Figure 4.
Water sampling 8.00mL is added 1.00mL national standard color developing agent and 2 drop sodium nitroprussides is molten in 10mL colorimetric cylinder
Liquid mixes, is diluted with water to graticule, mixes well, obtain blank sample
Sample to be tested is the sample for being derived from reservoir by 5 times of dilution processing, takes sample to be tested 8.00mL in 10mL colorimetric
Guan Zhong is added 1.00mL national standard color developing agent and 2 drop sodium nitroprusside solution, mixes, be diluted with water to graticule, sufficiently mixed
It is even, after the 60min that develops the color, at 697nm wavelength, with 10mm cuvette, absorbance is measured by reference of water, reading is 0.391.
Ammonia nitrogen actual content C in waste waterIt is practicalIt can be calculated according to absorbance A with following formula:
CIt is practical=(1.1533*A-0.0060) * 5
The ammonia-nitrogen content for calculating waste water accordingly is 2.22ppm.
Method comparison:
This method is compared with environment protectment protection (HJ536-2009), when having high determination of the upper limit and shorter reaction
Between, actually detected dilution is eliminated, is improved the practicability of traditional salicylic acid method.Design parameter is as follows:
| Relevant parameter | This method | National Standard Method |
| The range of linearity (mg/L) | 0.4-50.0 | 0.04-1.00 |
| Reaction time (min) | 20 | 60 |
| Detection limit (mg/L) | 0.05 | 0.01 |
In conclusion by means of above-mentioned technical proposal of the invention, by being replaced in standard method with dichlord isocyanurice acid
Hypochlorous acid, compared with standard method have higher determination of the upper limit and shorter reaction time.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of Quantitative Monitoring method of ammonia nitrogen in waste water, which comprises the following steps:
(1) the ammonia nitrogen standard reagent of different volumes is separately added into 4 volumetric flasks, constant volume simultaneously shakes up, and obtains various concentration
Ammonia nitrogen standard liquid；
(2) Ammonia nitrogen standard liquid, a certain amount of sodium hydroxide solution, bigcatkin willow of various concentration are separately added into 4 colorimetric cylinders
Acid reagent, cyanuric acid reagent, are diluted with water to scale and shake up, and obtain the ammonia nitrogen standard coloration liquid of various concentration, stand certain
Time, using water as reference, measured on spectrophotometer with unicast regular way obtained by ammonia nitrogen standard coloration liquid under 655nm wavelength
Absorbance-concentration values are inputted instrument, carry out linear fit, obtain standard curve by absorbance；
(3) two colorimetric cylinders are taken, a certain amount of waste water to be measured, sodium hydroxide solution, salicylic acid examination are added in a colorimetric cylinder
Agent and cyanuric acid reagent, are diluted with water to scale and shake up, obtain prepare liquid, in another colorimetric cylinder in addition and prepare liquid
Waste water equivalent to be measured without ammonium hydroxide, sodium hydroxide solution, bigcatkin willow acid reagent and cyanuric acid reagent, be diluted with water to scale and shake
It is even, obtain blank sample；
(4) prepare liquid and blank sample are stood into certain time；
(5) absorbance for measuring prepare liquid, is returned to zero with blank sample, is calculated according to the standard curve of step (2) production to be measured useless
Ammonia-nitrogen content in water.
2. the Quantitative Monitoring method of ammonia nitrogen in waste water according to claim 1, which is characterized in that the ammonia nitrogen standard coloration
Solution is respectively containing the ammonia nitrogen of 5ppm, 10ppm, 20ppm, 40ppm.
3. the Quantitative Monitoring method of ammonia nitrogen in waste water according to claim 1, which is characterized in that the bigcatkin willow acid reagent at
It is divided into the lemon of the sodium nitroprusside of 0.95wt%, the sodium salicylate of 44.2wt%, the trinitrophenol of 0.25wt%, 42wt%
The sodium tartrate of sour sodium, 12.6wt%.
4. the Quantitative Monitoring method of ammonia nitrogen in waste water according to claim 1, which is characterized in that the cyanuric acid reagent at
It is divided into the sodium tartrate of the lithium hydroxide of 2wt%, the sodium dichloro cyanurate of 3wt%, the sodium citrate of 85wt%, 10wt%.
5. the Quantitative Monitoring method of ammonia nitrogen in waste water according to claim 1, which is characterized in that the sodium hydroxide solution
Concentration be 1wt%, the addition volume of sodium hydroxide solution is 5.0mL.
6. the Quantitative Monitoring method of ammonia nitrogen in waste water according to claim 1, which is characterized in that the bigcatkin willow acid reagent adds
Entering amount is 0.80g, and cyanuric acid reagent dosage is 0.50g.
7. the Quantitative Monitoring method of ammonia nitrogen in waste water according to claim 1, which is characterized in that ammonia described in step (2)
The additional amount of nitrogen standard solution is 0.20mL, and the additional amount of waste water to be measured described in step (3) is 0.20mL.
8. the Quantitative Monitoring method of ammonia nitrogen in waste water according to claim 1, which is characterized in that the standard coloration liquid,
The time of repose of prepare liquid and blank sample is 20 minutes.
9. the Quantitative Monitoring method of ammonia nitrogen in waste water according to claim 1, which is characterized in that the colorimetric cylinder specification
For 10mL.
10. the Quantitative Monitoring method of ammonia nitrogen in waste water according to claim 1, which is characterized in that the standard curve
Correct coefficient of determination >=0.99.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110132949A (en) * | 2019-04-25 | 2019-08-16 | 中国中材国际工程股份有限公司 | The method for measuring cement plant flue gas the escaping of ammonia |
| CN110346361A (en) * | 2019-08-23 | 2019-10-18 | 中国科学院沈阳应用生态研究所 | The measuring method of ammonium nitrogen, nitric nitrogen, nitrite nitrogen and total dissolved nitrogen in a kind of sample |
| CN110849874A (en) * | 2019-12-05 | 2020-02-28 | 深圳市海聚源水产科技有限公司 | Ammonia nitrogen detection reagent formula suitable for high organic matter content culture water body and application |
| CN110987918A (en) * | 2019-12-23 | 2020-04-10 | 广东环凯微生物科技有限公司 | Detection reagent and rapid detection method for total nitrogen in water |
| CN111175237A (en) * | 2020-01-09 | 2020-05-19 | 中国神华煤制油化工有限公司 | Sodium salicylate spectrophotometric method for measuring ammonia nitrogen in water |
| CN111693474A (en) * | 2020-06-29 | 2020-09-22 | 中国第一重型机械股份公司 | Novel detection method of amino nitrogen/crude protein |
| CN112067416A (en) * | 2020-09-22 | 2020-12-11 | 广东石油化工学院 | Buffer solution and method for measuring ammonia nitrogen content in sewage by electrode method |
| CN112611725A (en) * | 2020-11-25 | 2021-04-06 | 江苏启辰检测科技有限公司 | Method for detecting ammonia nitrogen content in printing and dyeing wastewater |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132949A (en) * | 2019-04-25 | 2019-08-16 | 中国中材国际工程股份有限公司 | The method for measuring cement plant flue gas the escaping of ammonia |
| CN110346361A (en) * | 2019-08-23 | 2019-10-18 | 中国科学院沈阳应用生态研究所 | The measuring method of ammonium nitrogen, nitric nitrogen, nitrite nitrogen and total dissolved nitrogen in a kind of sample |
| CN110849874A (en) * | 2019-12-05 | 2020-02-28 | 深圳市海聚源水产科技有限公司 | Ammonia nitrogen detection reagent formula suitable for high organic matter content culture water body and application |
| CN110987918A (en) * | 2019-12-23 | 2020-04-10 | 广东环凯微生物科技有限公司 | Detection reagent and rapid detection method for total nitrogen in water |
| CN111175237A (en) * | 2020-01-09 | 2020-05-19 | 中国神华煤制油化工有限公司 | Sodium salicylate spectrophotometric method for measuring ammonia nitrogen in water |
| CN111693474A (en) * | 2020-06-29 | 2020-09-22 | 中国第一重型机械股份公司 | Novel detection method of amino nitrogen/crude protein |
| CN112067416A (en) * | 2020-09-22 | 2020-12-11 | 广东石油化工学院 | Buffer solution and method for measuring ammonia nitrogen content in sewage by electrode method |
| CN112611725A (en) * | 2020-11-25 | 2021-04-06 | 江苏启辰检测科技有限公司 | Method for detecting ammonia nitrogen content in printing and dyeing wastewater |
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