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Reduction method for reducing nitrate into nitrite in water and application of reduction method to detection of content of nitrate in water body

A nitrite and nitrate technology, which is applied in the field of water quality monitoring, can solve the problems of unsuitable nitrate content, high toxicity of cadmium particles, unsuitable nitrate, etc., and achieves the effects of easy availability of test chemicals and simple operation process.

Inactive Publication Date: 2020-08-11
OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The cadmium column reduction method is to use the reducibility of cadmium particles to slowly flow the sample solution to be tested through the cadmium column, and the nitrate is reduced to nitrite. It is highly toxic and has been restricted in use, so this method is not suitable for in situ monitoring of nitrate in seawater
The ultraviolet reduction method is to place the sample solution to be tested in an ultraviolet lamp irradiation environment, and induce the reduction of nitrate to nitrite by ultraviolet light irradiation. This method uses simple equipment, low price, and easy operation. It is a promising alternative to cadmium columns. A new method, which avoids the use of the toxic substance cadmium, but the UV method has no effect on NO 3 - The reduction efficiency is low, the stability is not good, and the detection limit is high, so it is not suitable for detecting the content of nitrate in low-salinity seawater

Method used

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  • Reduction method for reducing nitrate into nitrite in water and application of reduction method to detection of content of nitrate in water body
  • Reduction method for reducing nitrate into nitrite in water and application of reduction method to detection of content of nitrate in water body
  • Reduction method for reducing nitrate into nitrite in water and application of reduction method to detection of content of nitrate in water body

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] A method for detecting nitrate content in a water body, specifically as follows:

[0096] 1. Configure the experimental solution:

[0097] (1), DTPA-Na 2 HPO 4 Solution preparation: weigh DTPA 2.0g, Na 2 HPO 4 Put 16.0g in a beaker, add 400mL of water to dissolve, add 2-5mL of hydrochloric acid to adjust the pH to 6.50, transfer to a 1L volumetric flask, and dilute with ultrapure water. This is mixed solution 1;

[0098] (2), VCl 3 Solution preparation: weigh 0.2g VCl 3 In a beaker, add a small amount of water to dissolve, transfer to a 500mL volumetric flask, and dilute with ultrapure water;

[0099] (3), preparation of nitrosochromogenic agent: take by weighing 5.0g p-aminobenzenesulfonic acid and be dissolved in 350mL 14% dilute hydrochloric acid solution, take by weighing 0.4g naphthalene diamine dihydrochloride in the beaker, a small amount Dissolve in water, transfer p-aminobenzenesulfonic acid and dissolved naphthalene diamine dihydrochloride into a 500mL ...

Embodiment 2

[0117] A method for detecting nitrate content in a water body, specifically as follows:

[0118] 1. Configure the experimental solution:

[0119] (1), (3), (4), (5) are the same as embodiment 1;

[0120] (2), VCl 3 Solution preparation: weigh 1.0g VCl 3 In a beaker, add a small amount of water to dissolve, transfer to a 500mL volumetric flask, and dilute with ultrapure water;

[0121] 2. Draw the standard concentration curve of nitrate:

[0122] With embodiment 1.

[0123] 3. Sample testing

[0124] With embodiment 1.

Embodiment 3

[0126] A method for detecting nitrate content in a water body, specifically as follows:

[0127] 1. Configure the experimental solution:

[0128] With embodiment 1.

[0129] 2. Draw the standard concentration curve of nitrate:

[0130] (1), with embodiment 1;

[0131] (2), respectively above-mentioned each concentration nitrate standard solution and DTPA-Na 2 HPO 4 The buffer solution and the vanadium chloride aqueous solution were mixed with a volume ratio of 3:3:1, and then treated under ultraviolet lamp conditions for 3 minutes to complete the reduction reaction; then each treatment solution after reduction was mixed with the nitrous in the above-mentioned experimental solution. Mix the coloring agent with a volume ratio of 5:1, and measure the absorbance value at 520nm after standing for 2 minutes to obtain the absorbance value of the above-mentioned nitrate standard solution of each concentration;

[0132] (3), with embodiment 1;

[0133] 3. Sample testing

[0134]...

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Abstract

The invention provides a reduction method for reducing nitrate into nitrite in water and application of the reduction method in detection of nitrate content in water, and relates to the technical field of water quality monitoring. According to the reduction method for reducing nitrate into nitrite in water, a reducing agent is an aqueous solution containing vanadium ions. According to the reduction method, the vanadium ions are used as the reducing agent, nitrate in water can be effectively reduced into nitrite, and the method has the characteristics of high reduction rate and good stability and has the advantages of being non-toxic and environment-friendly compared with an existing reduction method using cadmium ions. Meanwhile, the method for detecting the nitrate content in the water body by applying the reduction method has the advantages of simple operation process, easily available test reagent and no need of complex detection equipment in the detection process, and is very suitable for in-situ analysis of the nitrate content in seawater.

Description

technical field [0001] The invention relates to the technical field of water quality monitoring, in particular to a method for reducing nitrate to nitrite in water and its application in detecting the nitrate content in water. Background technique [0002] The nitrate content in seawater is one of the indicators for water quality monitoring and evaluation of eutrophication in sea areas. On-site and real-time analysis and detection of nitrate content in seawater is of great significance for marine ecological early warning. There are many detection methods for nitrate in water, such as phenol disulfonic acid method, ion chromatography, high performance liquid chromatography, electrode method, Dairyler's alloy reduction method, hydrazine sulfate reduction method, etc. These methods have their own advantages, but generally have the disadvantages of cumbersome detection process and being easily affected by other substances, which cannot meet the requirements of in-situ analysis i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/28C01B21/50C02F1/70
CPCC01B21/50C02F1/705G01N1/28G01N21/31
Inventor 张艳敏邹妍史倩王阳孔祥峰刘岩
Owner OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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