Method for measuring total content of nitrogen of fresh water quality

A determination method and technology of nitrogen content, applied in the preparation of test samples, measurement of color/spectral characteristics, etc., can solve problems such as broken nozzles or plugs, poor sealing, cumbersome operation, etc., and achieve short digestion time, Easy operation, simple operation effect

Inactive Publication Date: 2014-10-01
江苏省水产技术推广站
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Problems solved by technology

However, the colorimetric tube is prone to breakage of the nozzle or plug during the digestion process, and must be re-sampled for analysis; and when the colorimetric tube is digested at high temperature and high pressure, the sealing is not good, and the nitrogen in

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  • Method for measuring total content of nitrogen of fresh water quality
  • Method for measuring total content of nitrogen of fresh water quality
  • Method for measuring total content of nitrogen of fresh water quality

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with specific embodiments. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0026] Equipment and instruments used in the experiment: high-pressure steam sterilizer HIRAYAMA HVE-50, Beijing Puyan TU-1901 ultraviolet spectrophotometer, Milli-Q Reference pure water instrument, digestion bottle rack, digestion bottle with a capacity of 100ml, specifications respectively Pipettes for 20-200 microliters, 100-1000 microliters, 500-5000 microliters, 1-10 milliliters.

[0027] Reagents used in the experiment:

[0028] Alkaline potassium persulfate solution: Weigh 40.0g potassium persulfate and dissolve it in 600ml water; another weigh 15.0g sodium hydroxide and dissolve it in 300ml water. After the temperature of the sodium hydroxide solution is cooled to room temperature, mix the t...

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Abstract

The invention provides a method for measuring the total content of nitrogen of fresh water quality. The method comprises the steps of sampling, preparing an alkaline potassium persulfate solution, preparing a potassium nitrate standard solution, preparing a hydrochloric acid solution, drawing a calibration curve and detecting a water sample to be measured. According to the method, a polytetrafluoroethylene decomposition bottle is adopted to replace a colorimetric tube, so that the decomposition process is relatively sealed and relatively fully carried out, and the decomposition time is relatively short; cross contamination is not caused between the inside and the outside of the decomposition bottle, and interference is eliminated, so that the result is relatively accurate, and the operation is relatively simple and relatively convenient; furthermore, an opening or a plug of the colorimetric tube is prevented from being broken in the decomposition process, so that the problem of analyzing by sampling again is avoided. Furthermore, after the colorimetric tube is replaced by the decomposition bottle, and a pipette is also used, the sample can be analyzed at the constant volume without being transferred into the colorimetric tube after being decomposed, so that the method is convenient, fast and easy to operate, and the accuracy is improved.

Description

technical field [0001] The invention relates to the field of measuring water quality standards, in particular to a method for measuring total nitrogen content in fresh water. 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. Potassium Sulfate Digestion Ultraviolet Spectrophotometry", specifically adding alkaline potassium persulfate solution to the colorimetric bottle containing the water sample, sealing the colorimetric bottle and putting it into a high-pressure steam sterilizer, heating and keeping the temperature at 120 -124°C for 30 minutes, after cooling to room temperature, add hydrochloric acid solution to the colorimetric tube, use a quartz cuvette on a UV spectrophotometer, use water as a reference, measure the absorbance at wavelengths of 220nm and 275nm respectively, and draw a calibration standar...

Claims

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Application Information

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IPC IPC(8): G01N21/33G01N1/44
Inventor 段翠兰樊宝洪张永江陈静陈光芸樊祥科郑浩杨振张莉
Owner 江苏省水产技术推广站
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