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Method for determining ammonia nitrogen content in water through Nessler reagent spectrophotometric method

A technology of spectrophotometry and Nessler's reagent, which is applied in the field of chemical analysis, can solve the problems of no accuracy, high analysis method, disadvantages, etc., and achieve the effect of improving accuracy, good repeatability, and small standard deviation

Inactive Publication Date: 2012-10-10
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. At present, there is no analytical method with high accuracy.

Method used

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Embodiment Construction

[0012] The present invention will be specifically introduced below in conjunction with specific embodiments.

[0013] 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.

[0014] The reagent that the present invention adopts is as follows:

[0015] a. Nessler's reagent mercuric dichloride-potassium iodide-potassium hydroxide:

[0016] Weigh 15g of potassium hydroxide, dissolve it in 50mL of distilled water, and cool to room temperature; weigh 5g of potassium iodide, dissolve it in 10mL of water, add mercury dichloride powder to the potassium iodide solution several times while stirring, until the solution turns dark yellow Or when micron re...

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Abstract

The invention discloses a method for determining ammonia nitrogen content in water through a Nessler reagent spectrophotometric method. The method comprises the following steps: (1) taking an original water sample to be analyzed; (2) performing pretreatment on the original water sample; (3) taking the water sample after pretreatment, loading into a colorimetric tube, shaking up, then adding a Nessler reagent into the colorimetric tube, further shaking up, placing for a certain period of time and adopting a spectrophotometer to test the absorbency of the water sample; (4) adopting distilled water to do a blank test to get blank absorbency; and (5) enabling the absorbency measured in the step (3) to deduct the blank absorbency measured in the step (4) to get correction absorbency, drawing a standard curve and calculating the ammonia nitrogen content in the water. The method has the benefits of fast determining the ammonia nitrogen content in the water, preventing suspended matters and residual chlorine from interfering with the detection result through the pretreatment of the original water sample, and effectively improving the accuracy of the detection result; and furthermore, the method is good in repeatability and less in relative standard deviation.

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 Nessler's reagent 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. At present, there is no analytical method wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/28
Inventor 胡松华黄印陈蓉赵昌平
Owner SUZHOU GUOHUAN ENVIRONMENT DETECTION
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