Determination of Cyromazine Residue by Molecularly Imprinted Electrochemical Sensor

A molecularly imprinted electrochemical sensor for fast determination of cyromazine was prepared by electropolymerization on the graphene-modified gold electrode, with o-phenylenediamine as the functional monomer and cyromazine as the imprinted molecular template. Several parameters controlling the performance of the molecularly imprinted electrochemical sensor were investigated in detail, such as the choice of functional monomer, the modification of gold electrode by graphene and the scan cycles, et al. Then the sensor was characterized by cyclic voltammetry, differential pulse voltammetry and electrochemical impedance method. The linear range of cyromazine was 6.0×10^-9-6.0×10^-4mol·L^-1, with detection limit (3s/k) of 1.0×10^-9mol·L^-1. Recovery rates obtained by standard addition method were in the range of 88.0%-102%, and RSDs (n=5) were in the range of 2.0%-3.5%.