Cadmium-copper reduction column reduction degree determination method for water body nitrate

A determination method and nitrate technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as inability to calculate the slope of the standard curve

Inactive Publication Date: 2008-01-16
OCEAN UNIV OF CHINA +1
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Problems solved by technology

[0013] However, unlike the manual method, the signal given by the continuous flow automatic chemical analyzer is not the absorbance value of the sample, but the percentage relative to the given concentration, and the baseline and gain during the detection process are automatically adjusted by the instrument, so it cannot To calculate the slope of the standard curve, it is necessary to check the reduction efficiency of the reduction column from other aspects

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  • Cadmium-copper reduction column reduction degree determination method for water body nitrate

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Embodiment Construction

[0018] The present invention will be further illustrated below by specific examples.

[0019] 1. Determination steps

[0020] Pipette a certain amount of nitrate and nitrite standard solution into a 25ml colorimetric tube, add nitrogen-free redistilled water to dilute to 10ml, add 10ml ammonium chloride buffer, shake well, and make the concentration 0, 5.0 , 10.0, 15.0, 20.0, 25.0mol / L standard series. The reducing column is activated and cleaned according to standard methods.

[0021] The multi-channel continuous flow automatic chemical analyzer first uses the nitrite analysis module to analyze the nitrite standard series; then uses the nitrate analysis module to analyze the nitrate standard series; finally uses the nitrate analysis module to analyze the nitrite standard series.

[0022] The only difference between the nitrate analysis module and the nitrite analysis module is that the nitrate analysis module has a cadmium-copper reduction column while the nitrite analysis ...

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Abstract

The invention discloses a determination method which determines the reduction degree of a cadmium-copper reduction post in water nitrate by continuous flowing automatic chemistry analysis instrument; the basic technical route is that: firstly, nitrite analysis module of multi-channel continuous flowing automatic chemistry analysis instrument is used to analyze nitrite standard series; secondly, nitrate analysis module is used to analyze nitrate standard series; thirdly, nitrate analysis module is used to analyze nitrite standard series; finally, the reduction degree of the cadmium-copper reduction post is determined by slope combination.

Description

technical field [0001] The invention belongs to the technical field of measuring nitrate in water body. Background technique [0002] Nitrate is the final oxidation product of nitrogen compounds in natural water bodies and is an essential nutrient salt for aquatic plants. In recent years, with the increasingly serious problems of eutrophication and red tide in the water environment, the distribution of nitrate in the water environment and its biogeochemical behavior have gradually attracted people's attention. [0003] There are many methods for the determination of nitrate, and the cadmium-copper reduction method and the zinc-cadmium reduction method are commonly used at present. [0004] The basic principles of these two methods are to first quantitatively reduce nitrate to nitrite, then measure the total amount of nitrite nitrogen according to the diazo-azo photometry, and deduct the original nitrite nitrogen in the water body to obtain Nitrate nitrogen content. Theref...

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Application Information

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IPC IPC(8): G01N35/00G06F17/00
Inventor 祝陈坚李晓虹陈洪涛姚庆祯
Owner OCEAN UNIV OF CHINA
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