Dedection of Parathion Based on Molecularly Imprinted Polymer of O-Aminothiophenol

A new electrochemical modified electrode for the detection of parathion was constructed based on molecularly imprinted polymer of self-assembled o-aminothiophenol onto gold electrode. Cyclic voltammetry was employed in the process of electropolymerization and electrochemical measurements. The template molecules and the nonbound o-aminothiophenol were removed from the modified electrode surface by washing with 0.5mol/L hydrochloric acid. The effects of the ratio of monomers to templates, pH and incubation time on the reduction peak current of parathion at the imprinted polymer film coated electrodes were demonstrated. Parathion imprinted and nonimprinted polymer films were exposed to a series of closely related compounds and the sensor exhibited good selectivity and sensitivity to parathion. A highly linear response to parathion in the concentration range of 5.0×10-7～1.0×10-4mol/L was observed, with a detection limit of 2.0×10-7mol/L estimated at a signal-to-noise ratio of 3.