Determination of Herbicide Pyrazosulfuron-ethyl Based on Molecularly Imprinted Electropolymerization Membrane Sensor

KeyWord:pyrazosulfuron-ethyl  molecular imprinting  electrochemical sensor  electropolymerization film

Abstract:

      A novel electrochemical sensor for pyrazosulfuron-ethyl£¨PSE£©detection based on molecularly imprinted polymer membrane was prepared by electropolymerization of o-aminophenol£¨oAP£©at gold electrode in the presence of template molecule.The modification procedure was characterized via cyclic voltammetry and electrochemical impedance spectroscopy.And its recognition performance was evaluated by differential pulse voltammmograms£¨DPV£©.Under the optimized conditions£¬the response current of K3Fe£¨CN£©6 probe on the proposed sensor decreased linearly with PSE concentration in the range of 2-150 ¦Ìmol/L with a detection limit of 0.65 ¦Ìmol/L£¨r2=0.995£©.With high selectivity and stability£¬the imprinted sensor was applied in the determination of PSE in environmental water samples with recoveries of 97.6%-104.4%.