Determination of 4-chlorophenoxyacetic acid by graphene electrochemical sensor
DU Ke-zhi1, DU Hai-jun1, ZHANG Yan1, ZHANG Xin-yue1, YANG Rong2, ZHANG Jiao-jiao2
1. School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China; 2. School of Ethnic-Minority Medicine, Guizhou Minzu University, Guiyang 550025, China
Abstract: Graphene prepared by electrochemical method is dissolved in N,N-dimethyl formamide solution and dispersed by ultrasound for 1 hour.An electrochemical sensor based on graphene-modified electrode is constructed by coating the dispersed graphene on the surface of glassy carbon electrode.The electrochemical behavior of 4-chlorophenoxyacetic acid on the graphene-modified electrode is investigated by cyclic voltammetry and linear scanning voltammetry,and the concentration of 4-chlorophenoxyacetic acid is determined by differential pulse voltammetry.The results show that the sensor has a good linear relationship in the concentration range of 0.5-100 μmol·L-1,and the minimum detection limit is 0.13 μmol·L-1 (S/N=3).It exhibits a good stability and strong anti-interference ability.As it is applied to the detection of 4-chlorophenoxyacetic acid in soybean sprouts,the recovery rate is in the range of 93.36%-101.4%.
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