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Method for measuring total nitrogen content in environmental water by adopting ultraviolet spectrophotometry

A technology of spectrophotometry and environmental water, which is applied in the field of chemical analysis, can solve the problems of difficult accuracy and achieve the effects of high accuracy, small standard deviation RSD, and high recovery rate of standard addition

Inactive Publication Date: 2012-10-03
SUZHOU GUOHUAN ENVIRONMENT DETECTION
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Problems solved by technology

[0002] The determination of total nitrogen content in environmental water samples is a must-test item for environmental monitoring, and the accuracy of the determination has always been a problem. At present, there is no determination method with high test accuracy.

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  • Method for measuring total nitrogen content in environmental water by adopting ultraviolet spectrophotometry

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Embodiment Construction

[0010] The present invention will be specifically introduced below in conjunction with specific embodiments.

[0011] A. Instruments and reagents

[0012] Lambda25 double-beam UV-Vis spectrophotometer;

[0013] Nitrogen standard solution: 1000mg / L;

[0014] Alkaline potassium persulfate solution: Weigh 40g of potassium persulfate and 12g of sodium hydroxide, dissolve in pure water, and dilute to 1L;

[0015] Hydrochloric acid solution: 1+9, which is prepared by mixing one volume of concentrated hydrochloric acid and nine volumes of pure water.

[0016] B. Test method

[0017] The method for determining the total nitrogen content in ambient water by ultraviolet spectrophotometry may further comprise the steps:

[0018] (1) Sampling: Collect the environmental water to be measured; the environmental water includes: surface water, ground water, and industrial wastewater.

[0019] (2) Preparation of ready-to-use reagents: alkaline potassium persulfate solution;

[0020] (3) W...

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Abstract

The invention discloses a method for measuring total nitrogen content in environmental water by adopting ultraviolet spectrophotometry. The method comprises the following steps: (1) sampling, that is, collecting environmental water to be detected; (2) preparing a reagent to be used, namely an alkaline potassium persulfate solution; (3) processing a water sample, that is, adding the alkaline potassium persulfate solution into the environmental water to be detected, then placing the water sample in a digester of 128 DEG C for digestion, reducing the obtained nitrate into nitrite through a cadmium column, adding a hydrochloric acid solution into the nitrite and uniformly fixing; (4) testing, that is, taking non-ammonia water as the reference and adopting an ultraviolet spectrophotometer to detect the absorbency; (5) achieving blank sample correction; and (6) calculating the total nitrogen content in the environmental water. The invention has the benefits that defects in the prior art are avoided; the method for measuring total nitrogen content in environmental water by adopting ultraviolet spectrophotometry, provided by the invention, is simple, and has high measurement accuracy; and samples detected by adopting the method has high recovery rate, and the RSD (Relative Standard Deviation) is small.

Description

technical field [0001] The invention relates to an environmental monitoring method, in particular to a method for measuring total nitrogen content in environmental water by ultraviolet spectrophotometry, and belongs to the field of chemical analysis. Background technique [0002] The determination of total nitrogen content in environmental water samples is a must-test item for environmental monitoring, and the accuracy of the determination has always been a problem. At present, there is no determination method with high test accuracy. Contents of the invention [0003] In order to solve the deficiencies in the prior art, the object of the present invention is to provide a method for measuring the total nitrogen content in environmental water by ultraviolet spectrophotometry, which is simple and has high measurement accuracy. [0004] In order to achieve the above object, the present invention adopts the following technical solutions: [0005] The method for determining th...

Claims

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Application Information

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IPC IPC(8): G01N21/33G01N1/28
Inventor 胡松华
Owner SUZHOU GUOHUAN ENVIRONMENT DETECTION
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