▎ 摘　　要

A molecularly imprinted electrochemical sensor based on graphene modified electrode was fabricated for determination of methyl parathion ( MP) . The molecularly imprinted polymer membrane was synthesized on the surface of graphene-modified glassy carbon electrode by using MP as template , methacrylic acid as functional monomer and ethylene glycol maleic rosinate acrylate as cross linker. The electrochemical properties of the sensor were investigated by cyclic voltammetry ( CV ) , differential pulse voltammetry ( DPV) and electrochemical impedance spectroscopy ( EIS) . Under optimal conditions , the peak current of the sensor showed a good linear correlation with the MP concentration in the range of 1.0 x10(-7) -8. 0 x10(-5) mol/L, with a detection limit of 5. 0 x 10(-8) mol/L ( S/N = 3 ). The linear regression equation was I-p ( mu A) = -0. 65199 - 0. 02387 C ( mu mol/L), with a correlation coefficient (R-2) of 0.9922. The adsorption model of the imprinted sensor was investigated , and the binding rate constant k was 20. 2758 s. The sensor was successfully applied to determination of MP in tomato samples with recoveries of 95. 0% to 100. 3%.