基于分子印迹电聚合膜传感器检测除草剂吡嘧磺隆

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

以除草剂吡嘧磺隆（PSE）为模板分子,邻氨基苯酚为功能单体,通过电化学聚合方法在金电极表面制备具有吡嘧磺隆分子孔穴的印迹薄膜,并采用循环伏安法和交流阻抗技术对传感器组装过程进行表征,差分脉冲伏安法对印迹膜传感器的识别性能进行测试.结果表明：在优化实验条件下,探针分子K3Fe （CN）6在印迹传感器上的峰电流响应值与PSE浓度在2～150 μmol/L（r2=0.995）范围内呈良好的线性关系,检出限为0.65 μmoL/L.传感器具备较好的选择性和稳定性,对环境水样的加标回收率为97.6％～ 104.4％.

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 μmol/L with a detection limit of 0.65 μmol/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％.