Preparation and Characterization of Parathion Sensor Based on Molecularly Imprinted Polymer

ZHANG Yan,KANG Tian-fang,LU Li-ping,CHENG Shui-yuan(College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100022,China)  

A novel electrochemical sensor for the detection of parathion based on molecularly imprinted polymer of self-assembled o-aminothiophenol onto gold electrode was constructed.The polymerization solution was prepared from a 10(mmol/L) parathion,5(mmol/L) tetra-n-butylammonium perchlorate,30(mmol/L) o-aminothiophenol solution of dichloromethane.Electropolymerization was carried out over 30 cycles between-0.3 V and 1.4 V.The template molecules were removed from the modified electrode surface by washing with 0.5(mol/L) hydrochloric acid.Cyclic voltammetry was employed in the process of electrochemical measurements.The experimental results show that the optimum acidity of background solution is pH 6.8 and the optimum incubation time is 10 min.A highly linear response to parathion in the concentration range of 1.0×10~(-4)-5.0×10~(-7)(mol/L) is observed,with a detection limit of 2.0×10~(-7)(mol/L) estimated at a signal-to-noise ratio of 3.The sensor has been applied to the analysis of parathion in real sample with recovery rates ranging from 98.0% to 104%.Parathion imprinted and nonimprinted polymer films were exposed to a series of closely related compounds,e.g.methyl-parathion,paraoxon,phoxim,omethoate,nitrobenzene and o-,m-,p-nitrophenol,and the sensor exhibited good selectivity and sensitivity to parathion.

【Key Words】： sensor electropolymerization molecularly imprinting parathion o-aminothiophenol
【Fund】： 国家自然科学基金项目(20247002);; 国家重点基础研究发展规划(973)项目(2005CB724201);; 北京自然科学基金项目(8062010)
【CateGory Index】： TP212

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