CN102721786A - Method for determining ammonia nitrogen content in water - Google Patents
Method for determining ammonia nitrogen content in water Download PDFInfo
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- CN102721786A CN102721786A CN2012101631806A CN201210163180A CN102721786A CN 102721786 A CN102721786 A CN 102721786A CN 2012101631806 A CN2012101631806 A CN 2012101631806A CN 201210163180 A CN201210163180 A CN 201210163180A CN 102721786 A CN102721786 A CN 102721786A
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- water
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- ammonia nitrogen
- indicator solution
- nitrogen content
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Abstract
The invention discloses a method for determining ammonia nitrogen content in water. The method comprises the following steps that: 1) firstly, alkali is added into a water sample to convert the ammonia nitrogen in the water into gaseous ammonia; 2) secondly, the gaseous ammonia passes through a pipe with a gas-liquid separation membrane and is dissolved in a PH indicator solution outside the pipe, thereby changing colors of the indicator solution; and 3) finally, the extent of the color change of the indicator solution has a linear relationship with the concentration of the ammonia nitrogen in the water, the relationship corresponding to the Lamber-Beer's law, and the ammonia nitrogen content in the water can be indirectly obtained by measuring absorbance of the PH indicator solution which absorbs the ammonia gas.
Description
Technical field
The present invention relates to pollutant monitoring determination and analysis method in a kind of environment water, especially a kind of method of measuring ammonia-nitrogen content in the water.
Background technology
Ammonia nitrogen in water source is mainly the decomposition product that itrogenous organic substance in the sanitary sewage receives microbial action, some industrial waste water, and agricultural drain.Measure the ammonia nitrogen in the water, help to estimate contaminated and " self-cleaning " situation of water body.At present, the assay method of ammonia nitrogen in the water has Na Shi colourimetry, salicylic acid-hypochlorite photometry, distillation-acidimetry, electrode method and gas molecule in space absorption process etc. usually.Characteristics such as that the nessler reagent colourimetry has is easy and simple to handle, sensitivity height, but equal interference measurement such as metallic ions such as calcium, magnesium and iron, sulfide, aldehyde and ketone, color and muddiness in the water need be done corresponding pre-service; And the nessler reagent mercury salt that uses in the analytic process has hypertoxicity, and environment has been caused pollution.The problem that salicylic acid-hypochlorite photometry exists mainly is: developing time is long, wants usually more than 1 hour; Colour developing liquid poor stability is difficult for preserving; Aniline and monoethanolamine produce serious the interference to this method, and too high acidity and basicity all can be disturbed the formation of color-developing compounds.Distillation-acidimetry is that water sample is added thermal distillation, and the ammonia that discharges is absorbed by BAS, is reagent with methyl red-methylenum careuleum, with the ammonium in the sour standard solution titration distillate.This method is easy and simple to handle, sensitivity is higher, but in titration process, adopts visual method to judge titration end-point, has introduced than mistake.Electrode method measurement range is wide, and the response time is short, does not receive the influence of colourity and turbidity, but it is low to measure complicated water body accuracy, and electrode needs often to safeguard.Than higher, and instrument costs an arm and a leg the gas molecule in space absorption process to water quality requirement.
Summary of the invention
The purpose of this invention is to provide a kind of quick, easy, measure the method for ammonia-nitrogen content in the water exactly.
In order to solve the existing problem of background technology, the present invention adopts following technical scheme:
The present invention provides a kind of method of measuring ammonia-nitrogen content in the water, may further comprise the steps:
1) in water sample, adds alkali, make that ammonia nitrogen is converted into gaseous ammonia in the water;
Because ammonia exists following balance: NH in water
4 ++ OH
-=NH
3+ H
2O, thereby can the ammonium radical ion in the water sample all be converted into free ammonia through the method that in sample, adds NaOH, ammonia is volatile, forms certain density vapor phase ammonia in solution surface, NH in this concentration and the solution
3Molecular conecentration meets Henry's law, i.e. P=KC, and P is NH in the formula
3Partial vapour pressure, K is a Henry's constant, C is NH in the solution
3Molecular conecentration.Detect the concentration of solution surface vapor phase ammonia, just can obtain ammonia nitrogen concentration in the water sample.
2) gaseous ammonia sees through the gas-liquid separation membrane pipe, is dissolved in the outer soda acid indicator solution of film pipe, and the indicator solution color is changed;
Ammonia is a kind of alkalescent gas, selects a kind of suitable soda acid indicator solution, and ammonia sees through the gas-liquid separation membrane pipe, and the indicator solution color is changed.Acid base indicator is complicated organic monoacid or an organic weak base of a class formation; Their ability partial ionizations in solution become the ion and the hydrogen ion (or hydroxide ion) of indicator; And because structural variation; Their molecule and ion have various colors, thereby in the different solution of pH, present various colors.The present invention is through the multiple acid base indicator of test, and finally having selected the phenol red solution (the pH value is 7.0) of interpolation surfactant is indicator solution, and this soda acid indicator solution chemical property is stable, and colour developing is sensitive rapidly, and and OH
-Ion concentration linear relationship scope is wide.
3) ammonia nitrogen concentration is linear in the degree of indicator solution change color and the water, promptly meets langbobier law.
According to langbobier law A=ε bc; ε is a molar absorptivity in the formula, and b is that the length that irradiates light sees through sample is light path, and c is the amount of substance concentration of the gaseous ammonia that dissolves in the indicator solution herein; From formula, can know; The absorbance of acid base indicator be with sample in the concentration of ammonia be directly proportional, the measurement through to the absorbance of the acid base indicator that absorbed ammonia just can obtain the ammonia nitrogen content in the water sample indirectly.
The present invention has following beneficial effect:
1) through the gas-liquid separation membrane pipe, avoids water sample and indicator directly to react, eliminated the influence of colourity, turbidity and the suspension contrast color method mensuration of water sample; 2) through selecting suitable soda acid indicator solution, make that the detection sensitivity of ammonia nitrogen concentration is higher in the water sample, the range of linearity is wider, and stability is better
Embodiment
According to embodiment the present invention is done further explain below.
It is following that ammonia nitrogen detects step:
1) compound concentration is respectively 0.0 and the NH of 50.0mg/L (concentration is in the N element)
4Cl solution is respectively as standard specimen one and standard specimen two, and the alkali lye that discharges ammonia is 0.02mol/lNaOH solution, and the soda acid indicator solution is the 50mg/l phenol red WS of interpolation surfactant, and adjusting absorption liquid pH value is 7.0;
2) standard specimen one produces ammonia with the NaOH solution reaction respectively with standard specimen two, and ammonia sees through the gas-liquid separation membrane pipe changes soda acid indicator solution color;
3) through in colorimetric pool, measuring the absorbance of soda acid indicator solution, draw the change curve of absorbance and ammonia nitrogen concentration;
4) 5 water samples to be measured are imported the ammonia nitrogen online automatic monitors, measure the indicator solution absorbance, the curve calculation of drawing according to step 3) the ammonia nitrogen concentration of water sample, each water sample replicate determination 3 times, and data are got its mean value.The result is following: water sample 1:0.76; Water sample 2:5.31; Water sample 3:11.43; Water sample 4:28.63; Water sample 5:42.69;
5) result verification: utilize national standard method salicylic acid-hypochlorite photometry that five water samples in the step 4) are detected, its mean value is got in test repetition 3 times, and the result is following: water sample 1:0.74; Water sample 2:5.37; Water sample 3:11.37; Water sample 4:28.01; Water sample 5:43.59;
6) result verification shows: the testing result of method provided by the invention and national standard method is close.
The concentration range of ammonia nitrogen is 0-300mg/L in the such scheme.
Obviously, the above embodiment of the present invention only be for clearly the present invention is described and is done for example, and be not to be qualification to embodiment of the present invention.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation and changes.Here can't give exhaustive to all embodiments.Everyly belong to the row that conspicuous variation that technical scheme of the present invention amplifies out or change still are in protection scope of the present invention.
Claims (3)
1. a method of measuring ammonia-nitrogen content in the water comprises the following steps:
1) at first, in water sample, adds alkali, make that ammonia nitrogen is converted into gaseous ammonia in the water;
2) secondly, gaseous ammonia sees through the gas-liquid separation membrane pipe, is dissolved in the outer soda acid indicator solution of film pipe, and the indicator solution color is changed;
3) last, ammonia nitrogen concentration is linear in the degree of indicator solution change color and the water, promptly meets langbobier law, and the measurement through to the absorbance of the acid base indicator that absorbed ammonia just can obtain the ammonia nitrogen content in the water sample indirectly.
2. according to the described method of claim 1, in said step 1), the said alkali that in water sample, adds is NaOH.
3. according to the described method of claim 1, in said step 2) in, said soda acid indicator solution be added surfactant, the pH value is 7.0 phenol red solution.
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| CN2012101631806A CN102721786A (en) | 2012-05-24 | 2012-05-24 | Method for determining ammonia nitrogen content in water |
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| CN2012101631806A CN102721786A (en) | 2012-05-24 | 2012-05-24 | Method for determining ammonia nitrogen content in water |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674867A (en) * | 2013-11-29 | 2014-03-26 | 中国科学院电子学研究所 | Method for detecting ammonia nitrogen concentration of water sample |
| CN104345057A (en) * | 2013-08-05 | 2015-02-11 | 上海索诚化学试剂有限公司 | Test paper for detecting residual chlorine, pH value and total alkalinity in water |
| CN105334208A (en) * | 2015-04-09 | 2016-02-17 | 中国科学院城市环境研究所 | Method for determining ammonia nitrogen in trace amount of solution under interference of iron and copper metal ions |
| CN110794051A (en) * | 2019-10-29 | 2020-02-14 | 天津大学 | Method for determining ammonia nitrogen content in water by using CAF |
| CN112326912A (en) * | 2020-11-04 | 2021-02-05 | 海南聚能科技创新研究院有限公司 | Device for detecting ammonia nitrogen concentration in liquid |
| CN117524339A (en) * | 2024-01-04 | 2024-02-06 | 攀枝花市东区生态环境监测站 | Method and system for measuring residual chlorine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08201370A (en) * | 1994-11-22 | 1996-08-09 | Sumitomo Seika Chem Co Ltd | Measuring method for trace moisture |
| CN101226153A (en) * | 2007-12-25 | 2008-07-23 | 洪陵成 | Method and apparatus for testing flow injection ammonia nitrogen color comparison |
| CN101453027A (en) * | 2008-07-13 | 2009-06-10 | 李钢坤 | Fuel system for mobile hydrogen production fuel cell and apparatus thereof |
-
2012
- 2012-05-24 CN CN2012101631806A patent/CN102721786A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08201370A (en) * | 1994-11-22 | 1996-08-09 | Sumitomo Seika Chem Co Ltd | Measuring method for trace moisture |
| CN101226153A (en) * | 2007-12-25 | 2008-07-23 | 洪陵成 | Method and apparatus for testing flow injection ammonia nitrogen color comparison |
| CN101453027A (en) * | 2008-07-13 | 2009-06-10 | 李钢坤 | Fuel system for mobile hydrogen production fuel cell and apparatus thereof |
Non-Patent Citations (3)
| Title |
|---|
| 化学工业部化学试剂标准化技术归口单位等: "《化学试剂标准大全》", 31 August 1995, article "苯酚红", pages: 434-435 * |
| 周珂等: "改进测定水中氨氮分子吸收光谱法的试验研究", 《环境科学与技术》, vol. 35, no. 3, 31 March 2012 (2012-03-31), pages 147 - 150 * |
| 贾春晓等: "烟草中总挥发酸含量的分析方法研究", 《郑州轻工业学院学报(自然科学版)》, vol. 17, no. 1, 31 March 2002 (2002-03-31), pages 3 - 6 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104345057A (en) * | 2013-08-05 | 2015-02-11 | 上海索诚化学试剂有限公司 | Test paper for detecting residual chlorine, pH value and total alkalinity in water |
| CN103674867A (en) * | 2013-11-29 | 2014-03-26 | 中国科学院电子学研究所 | Method for detecting ammonia nitrogen concentration of water sample |
| CN103674867B (en) * | 2013-11-29 | 2015-12-30 | 中国科学院电子学研究所 | The detection method of ammonia nitrogen concentration of water sample |
| CN105334208A (en) * | 2015-04-09 | 2016-02-17 | 中国科学院城市环境研究所 | Method for determining ammonia nitrogen in trace amount of solution under interference of iron and copper metal ions |
| CN105334208B (en) * | 2015-04-09 | 2018-12-04 | 中国科学院城市环境研究所 | A kind of iron, copper metal ion interfere the measuring method of ammonia nitrogen in lower micro solution |
| CN110794051A (en) * | 2019-10-29 | 2020-02-14 | 天津大学 | Method for determining ammonia nitrogen content in water by using CAF |
| CN110794051B (en) * | 2019-10-29 | 2022-09-02 | 天津大学 | Method for determining ammonia nitrogen content in water by using CAF |
| CN112326912A (en) * | 2020-11-04 | 2021-02-05 | 海南聚能科技创新研究院有限公司 | Device for detecting ammonia nitrogen concentration in liquid |
| CN117524339A (en) * | 2024-01-04 | 2024-02-06 | 攀枝花市东区生态环境监测站 | Method and system for measuring residual chlorine |
| CN117524339B (en) * | 2024-01-04 | 2024-03-19 | 攀枝花市东区生态环境监测站 | Method and system for measuring residual chlorine |
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Application publication date: 20121010 |