▎ 摘　　要

NOVELTY - Preparing bensulfuron-methyl molecularly imprinted electrochemical sensor involves using graphene-modified screen printing electrodes as substrate, performing electropolymerization to form molecularly imprinted polymer in acidic sodium sulfate solution of aminothiophenol, neutral red bifunctional monomer and bensulfuron-methyl. The detection limit of the molecularly imprinted electrochemical sensor prepared by method for bensulfuron-methyl is 1.35x 10-7mol/L, and linear range is 2.1x 10-6mol/L-9.6x 10-5mol/L. The screen-printed electrodes are washed with acetone, ethanol and deionized water, respectively, ultrasonically for multiple minutes. The electrode is scanned in K3Fe(CN)6 to obtain reversible cyclic voltammetry peak which proves that electrode is processed well. The dispersed graphene suspension is dropped onto the screen-printed electrode to form uniform dispersion layer, and dried naturally to obtain graphene-modified electrode. USE - Method for preparing bensulfuron-methyl molecularly imprinted electrochemical sensor. ADVANTAGE - The method enables to prepare bensulfuron-methyl molecularly imprinted electrochemical sensor that has simple and practical preparation method, good stability and selectivity. DETAILED DESCRIPTION - Preparing bensulfuron-methyl molecularly imprinted electrochemical sensor involves using graphene-modified screen printing electrodes as substrate, performing electropolymerization to form molecularly imprinted polymer in acidic sodium sulfate solution of aminothiophenol, neutral red bifunctional monomer and bensulfuron-methyl. The detection limit of the molecularly imprinted electrochemical sensor prepared by method for bensulfuron-methyl is 1.35x 10-7mol/L, and linear range is 2.1x 10-6mol/L-9.6x 10-5mol/L. The screen-printed electrodes are washed with acetone, ethanol and deionized water, respectively, ultrasonically for multiple minutes. The electrode is scanned in K3Fe(CN)6 to obtain reversible cyclic voltammetry peak which proves that electrode is processed well. The dispersed graphene suspension is dropped onto the screen-printed electrode to form uniform dispersion layer, and dried naturally to obtain graphene-modified electrode. The aminothiophenol, neutral red bifunctional monomer and bensulfuron are dissolved in acidic sodium sulfate solution and mixed well. The molar ratio of aminothiophenol to neutral red bifunctional monomer and bensulfuron-methyl is (1-5):(1-5):1. The previously mixed solution is used as electrolyte solution, and graphene-modified electrode is placed in the mixed solution. The electrochemical polymerization is conducted to form molecularly imprinted polymer, washed away the bensulfuron-methyl template molecule with methanol/acetic acid solution to get final product.