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Spectrophotometric method for determining ammonia nitrogen content in water

A technology of spectrophotometry and ammonia nitrogen content, which is applied in the detection of environmental water samples and the determination of ammonia nitrogen content in water by spectrophotometry, can solve unfavorable problems and achieve the effect of improving accuracy, small standard deviation and good repeatability

Inactive Publication Date: 2012-10-17
SUZHOU GUOHUAN ENVIRONMENT DETECTION
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Problems solved by technology

It can be seen that drinking water containing ammonia nitrogen for a long time is extremely harmful to the body.
Therefore, the environmental protection department is gradually paying attention to the detection of ammonia nitrogen content in water, but there is no easy-to-operate detection method at present

Method used

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  • Spectrophotometric method for determining ammonia nitrogen content in water

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Embodiment Construction

[0011] The present invention will be specifically introduced below in conjunction with specific embodiments.

[0012] The present invention is realized based on the following principles: the ammonia nitrogen in the form of free ammonia or ammonium ions reacts with Nessler's reagent to generate a yellow-brown complex, and the chromaticity of the complex is proportional to the content of ammonia nitrogen. In view of this , the content of ammonia nitrogen in water samples was determined by spectrophotometry.

[0013] The reagent that the present invention adopts is as follows:

[0014] a. Nessler's reagent mercuric iodide-potassium iodide-sodium hydroxide:

[0015] Weigh 15g sodium hydroxide, dissolve in 50mL distilled water, cool to room temperature; weigh 7g potassium iodide and 10g mercury iodide, dissolve in water to form a solution, slowly add this solution to the sodium hydroxide solution under stirring, and dilute To 100mL, that is the ready-to-use Nessler's reagent.

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Abstract

The invention discloses a spectrophotometric method for determining the ammonia nitrogen content in water. The method comprises the steps that: (1) an original water sample requiring analyzing is fetched; (2) pre-treatment of the original water sample is carried out, wherein residual chlorine is removed, suspended solids are removed by filtration, and a masking agent which is potassium sodium tartrate is added for eliminating the interference of magnesium ions; (3) the absorbance of the water sample is tested by using a spectrophotometer; (4) a blank test is carried out by using distilled water, such that a blank absorbance is obtained; and (5) the blank absorbance obtained in the steps (4) is subtracted from the absorbance obtained in the step (3), such that a corrected absorbance is obtained; a standard curve is drawn, and the ammonia nitrogen content in water is calculated. The method provided by the invention is advantaged in that: with the method provided by the invention, the ammonia nitrogen content in water can be rapidly and conveniently tested. Through the pre-treatment upon the original water sample, interferences of the suspended solids, the residual chlorine, the calcium ions and the magnesium ions upon testing results can be avoided, and the accuracy of testing results can be effectively improved. The method is also advantaged in good repeatability and low relative standard partial.

Description

technical field [0001] The invention relates to a method for detecting environmental water samples, in particular to a method for measuring ammonia nitrogen content in water by spectrophotometry, and belongs to the field of chemical analysis. Background technique [0002] Ammonia nitrogen in water mainly comes from the initial pollution of nitrogen-containing organic matter in domestic sewage. Under the action of microorganisms naturally existing in water, ammonia nitrogen will be decomposed into nitrite nitrogen. When the content of nitrite nitrogen in water is too high, drinking water will be with Proteins combine to form nitrosamines, which are strong carcinogens. It can be seen that drinking water containing ammonia nitrogen for a long time is extremely harmful to the body. Therefore, the environmental protection department is gradually paying attention to the detection of ammonia nitrogen content in water, but there is no easy-to-operate detection method at present. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/34
Inventor 胡松华黄印陈蓉赵昌平
Owner SUZHOU GUOHUAN ENVIRONMENT DETECTION
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