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Method for detecting nitrite ion concentration in solution

A technology of nitrite ion and concentration, which is applied in the detection of nitrite ion concentration in solution, and in the field of electrochemical sensing of glassy carbon electrodes. Large overpotential and other issues, to achieve the effect of fast electron transfer, promotion of electron transfer, and good electrochemical stability

Active Publication Date: 2018-08-07
广西燕口福生物科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although nitrite has an electrochemical response directly on the glassy carbon electrode, its redox overpotential is relatively large, and intermediate products generated by the oxidation of nitrous acid may contaminate the electrode surface, and other ions can easily interfere with its determination, reducing the sensitivity and sensitivity of the electrode. accuracy of use

Method used

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  • Method for detecting nitrite ion concentration in solution
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Examples

Experimental program
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Effect test

Embodiment 1

[0035] A carboxylated graphene / polypyrrole / chitosan modified electrode, the preparation method comprising the following steps:

[0036] S1: Mix 0.8mg carboxylated graphene with 4mL pyrrole and soak in ethanol solution, then add 0.08mol / L ferric chloride solution to polymerize polypyrrole on the surface of carboxylated graphene, stir at room temperature for 50min, add Deionized water, highly centrifuged and repeated several times until the supernatant was clear and the pH was neutral, separated to obtain the lower precipitate, and dried in vacuum at 55°C to obtain carboxylated graphene-polypyrrole;

[0037] S2: Dissolving 3 mg of carboxylated graphene-polypyrrole in 0.8 mL of a chitosan solution with a mass fraction of 0.5 wt%, and ultrasonicating for 50 minutes to obtain a carboxylated graphene-polypyrrole-chitosan mixed solution;

[0038] S3: Take 3 μL of the carboxylated graphene-polypyrrole-chitosan mixture and titrate it on the glassy carbon electrode, and dry it to obtain...

Embodiment 2

[0041] A carboxylated graphene / polypyrrole / chitosan modified electrode, the preparation method comprising the following steps:

[0042] S1: Mix 1.2mg carboxylated graphene with 4mL pyrrole and soak in ethanol solution, then add 0.12mol / L ferric chloride solution to polymerize polypyrrole on the surface of carboxylated graphene, stir at room temperature for 70min, add Deionized water, highly centrifuged and repeated several times until the supernatant was clear and the pH was neutral, separated to obtain the lower precipitate, and dried in vacuum at 65°C to obtain carboxylated graphene-polypyrrole;

[0043] S2: 5 mg of carboxylated graphene-polypyrrole was dissolved in 1.2 mL of a chitosan solution with a mass fraction of 0.5 wt%, and ultrasonicated for 70 minutes to obtain a carboxylated graphene-polypyrrole-chitosan mixture;

[0044] S3: Take 5 μL of the carboxylated graphene-polypyrrole-chitosan mixture and titrate it on the glassy carbon electrode, and dry it to obtain the ...

Embodiment 3

[0047] A carboxylated graphene / polypyrrole / chitosan modified electrode, the preparation method comprising the following steps:

[0048] S1: Mix 1.0mg carboxylated graphene with 4mL pyrrole and soak in ethanol solution, then add 0.1mol / L ferric chloride solution to polymerize polypyrrole on the surface of carboxylated graphene, stir at room temperature for 60min, add Deionized water, highly centrifuged and repeated several times until the supernatant was clear and the pH was neutral, separated to obtain the lower precipitate, and dried in vacuum at 60°C to obtain carboxylated graphene-polypyrrole;

[0049] S2: Dissolve 4 mg of carboxylated graphene-polypyrrole in 1 mL of a chitosan solution with a mass fraction of 0.5 wt%, and ultrasonicate for 60 minutes to obtain a carboxylated graphene-polypyrrole-chitosan mixture;

[0050] S3: Take 4 μL of the carboxylated graphene-polypyrrole-chitosan mixture and titrate it on the glassy carbon electrode, and dry it to obtain the carboxyla...

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Abstract

The invention discloses a method for detecting the concentration of nitrite ions in a solution, which includes the following steps: Step 1: Polymerize carboxylated graphene and pyrrole to form carboxylated graphene-polypyrrole, and dissolve it in a solution with a mass fraction of 0.5wt% In the chitosan solution, ultrasonicate to obtain a carboxylated graphene-polypyrrole-chitosan mixture, titrate it onto a glassy carbon electrode, and dry it to obtain a carboxylated graphene / polypyrrole / chitosan modified electrode; step two, use The carboxylated graphene / polypyrrole / chitosan modified electrode prepared in step 1 was used as the working electrode. According to the differential pulse voltammetry curve of nitrite ions, a three-electrode system was used to measure the nitrous acid in the test solution through differential pulse voltammetry. The concentration of radical ions is detected. The invention has the advantages of simple operation, fast detection and high sensitivity, and can perform highly sensitive identification of nitrite ions in the mixed sample solution.

Description

technical field [0001] The invention relates to the technical field of nitrite ion detection. More specifically, the present invention relates to a method for detecting the concentration of nitrite ions in a solution by differential pulse voltammetry based on carboxylated graphene / polypyrrole / chitosan modified glassy carbon electrode electrochemical sensing. Background technique [0002] Nitrite is a recognized inorganic pollutant that widely exists in the environment, food, industry and physiological systems, and is widely used in food preservation. However, related studies have shown that excessive intake of nitrite is harmful to both humans and animals. For example, nitrite is converted in the stomach to carcinogenic nitrosamines, which react irreversibly with hemoglobin to produce a compound (methemoglobin) that reduces the blood's ability to transport oxygen. The World Health Organization (WHO) has clearly stipulated that the content of nitrite in raw water should not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/48
CPCG01N27/48
Inventor 肖琦黄珊冯萌萌卢双燕黄初升苏炜何英姿
Owner 广西燕口福生物科技股份有限公司
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