Preparation method of electrochemical sensor for detecting residual pesticides

Abstract

The invention relates to a preparation method of an electrochemical sensor for detecting residual pesticides. A novel wire-mesh electrochemical sensor based on a graphene modified electrode is prepared by using a screen printing technology. The electrochemical sensor provided by the invention can realize simultaneous detection on isoproturon and carbendazim through simple sample dripping measurement; the electron transfer of isoproturon and carbendazim can be effectively enhanced so that isoproturon and carbendazim can be simply, rapidly and quantitatively detected. The electrochemical sensor provided by the invention realizes the rapid and simple simultaneous detection on isoproturon and carbendazim pesticides in environment water, soil and foods.

Description

technical field [0001] The invention relates to the preparation of an electrochemical sensor, in particular to a preparation method of an electrochemical sensor based on a graphene modified electrode for simultaneous detection of isoproturon and carbendazim insecticides. Background technique [0002] A pesticide is a class of chemicals used to control agricultural and public health pests. Because pesticides are widely used in crops and vegetables, resulting in the accumulation of their residues, and the residues of pesticides will be widely distributed in the food chain, and will be leached into the water environment through the penetration of soil into underground and surface water, which is harmful to humans. Health and the environment pose a great threat. Therefore, it is becoming more and more important for human safety and health to construct simple, highly sensitive, and selective green analytical methods to achieve rapid and accurate detection of pesticide residues. ...

AI Technical Summary

Problems solved by technology

However, these methods have many disadvantages: such as the need for complex detection equipment, professional operation skills, long analysis time, complicated sample pretreatment, use of toxic organic solvents, etc., these defects severely limit the application of pesticide detection methods. application

However, these methods are only used for the detection of single compounds, not for their simultaneous detection. These electrodes or modified electrodes are usually relatively expensive, difficult to build, and require electrode pretreatment / polishing steps, which often require comparison. Time-consuming multi-step modification process

[0006] A boron-doped diamond (BDD) electrode has been reported in the literature and used to detect carbendazim and fenamiphos, but the BDD electrode is expensive

In addition, the non-enzyme sensor based on extraction cyclic voltammetry analysis is also an effective method for pesticide analysis, but the whole process is carried out in a traditional electrochemical cell, which often requires a large amount of samples and reagents

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