Modified glassy carbon electrode, preparation method for same and application thereof in nitrite detection

Abstract

The invention provides a modified glassy carbon electrode, which is an L-cysteine modified glassy carbon electrode or a platinum / L-cysteine modified glassy carbon electrode. The preparation method for the L-cysteine modified glassy carbon electrode includes the steps: firstly, treating a glassy carbon electrode into a bare glassy carbon electrode; secondly, drying the bare glassy carbon electrode and inserting the bare glassy carbon electrode into electrolyte solution for cyclic voltammetry scanning to obtain treated glassy carbon electrode; and thirdly, placing the treated glassy carbon electrode into buffer solution containing L-cysteine for electro-polymerization, and obtaining the L-cysteine modified glassy carbon electrode after cleaning and drying the treated glassy carbon electrode. Besides, the platinum / L-cysteine modified glassy carbon electrode is obtained by placing the L-cysteine modified glassy carbon electrode into sulfuric acid solution containing chloroplatinic acid for electro-deposition and after cleaning and drying the L-cysteine modified glassy carbon electrode. The invention further provides application of the modified glassy carbon electrode in the nitrite detection. The modified glassy carbon electrode is capable of promoting electron transfer, current response is enhanced, a modification method is simple and convenient, and the modified glassy carbon electrode is simple in operation, fine in responsiveness and applicable to nitrite detection.

Description

technical field [0001] The invention relates to a modified glassy carbon electrode, and also relates to a preparation method of the modified glassy carbon electrode and its application in detecting nitrite. Background technique [0002] Nitrite is a harmful substance that widely exists in the environment. In the food industry, nitrite is often used as a coloring agent, which has antibacterial and antiseptic effects. However, when nitrite enters the human body, it can generate strong carcinogenic nitrosamines. With the strengthening of people's environmental awareness and food safety awareness, nitrite has become a must-test item in environmental testing and food analysis. At present, the determination methods of nitrite content mainly include continuous flow analysis, spectrophotometry, fluorescence method, chromatography, electrochemical determination, etc. In comparison, electrochemical determination of nitrite content has high sensitivity, rapidity, The advantages of sim...

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Problems solved by technology

However, due to the low concentration of active groups, the scope of application is limited

There is no report on immobilizing L-cys to glassy carbon electrodes to form L-cys modified glassy carbon electrodes and platinum / L-cysteine ​​modified glassy carbon electrodes.

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