Preparation and Performance of Molecularly Imprinted Electrochemical Sensor of Tetramethrin

A sensitive film of tetramethrin was imprinted molecularly on glassy carbon electrode by cyclic voltammetric electropolymerization using o-aminophenol as the monomer and tetramethrin as imprinting molecules. The imprinted electrochemical sensor obtained was characterized by methods of field emission scanning electron microscope and electrochemistry, e.g., cyclic voltammetry, differential pulse voltammetry (DPV) and etc. It was shown by the experimental results, significant differences in morphological structure and electrochemical characteristic were observed before and after the removal of the imprinted molecules. The response property of the sensor was studied by DPV, using K3［Fe(CN)6］ as electrochemical probe. Linear relationship between values of change in peak current (Δi) of the sensor and concentration of tetramethrin was obtained in the range of 10.0-100 nmol·L-1, with its detection limit (3σ) of 5.8 nmol·L-1. Time of response of the sensor was found within 10 min. Value of RSD (n=7) found was 2.76%. Recovery of tetramethrin was tested by standard addition method, giving results in the range of 96.0%-103.0%.