Au-TiO2/Chit modified sensor for electrochemical detection of trace organophosphates insecticides

In this paper, Au-TiO(2)/Chit modified electrode was prepared with Au-TiO(2) nanocomposite (Au-TiO(2)) and Chitosan (Chit) as a conjunct. The Au-TiO(2) nanocomposite and the films were characterized by electrochemical and spectroscopy methods. A set of experimental conditions was also optimized for the film's fabrication. The electrochemical and electrocatalytic behaviors of Au-TiO(2)/Chit modified electrode to trace organophosphates (OPs) insecticides such as parathion were discussed in this work. By differential pulse voltammetry (DPV) measurement, the current responses of Au-TiO(2)/Chit modified electrode were linear with parathion concentration ranging from 1.0 ng/ml to 7.0 x 10(3) ng/ml with the detection limit of 0.5 ng/ml. In order to evaluate the performance of the detection system, we also examined the real samples successfully in this work. It exhibited a sensitive, rapid and easy-to-use method for the fast determination of trace OPs insecticides. (C) 2008 Elsevier B.V. All rights reserved.