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Abstract: Molecularly imprinted polymer (MIP) was synthesized on the surface of Ni electrode with the template molecules of chlortoluron. After elution, some of the imprinted cavities in MIP can re-bind with chlortoluron molecules. Hydrogen peroxide, which acts as the probe,can enter into the left cavities and are reduced on the Ni electrode surface to form " gate controlled electro-reduction ". The MIP sensor can be used to detect chlortoluron with high sensitivity due to the highly electrochemically catalytic reduction of H 2 O 2 on the Ni electrode. The mole ratio of template molecules, functional monomer and crosslinking agent in molecular imprinted polymer film was found to be 1:12:30, re-adsorption time was 10min and the optimum pH value was 7.2. Chlortoluron could be analyzed in the range of 1.0 x 10-4 - 4.0 x 10-7 mol / L with a detection limit of 2.9 x 10-8 mol / L. In addition, the feasibility of the practical applications of the MIP sensor has been demonstrated in the analysis of water samples and showed good recovery, ranging from 97%to 103%.
Template and target information: chlortoluron
Author keywords: Molecularly imprinting sensor, Electro-catalyzation, Gate controlled, chlortoluron, Nickel electrode