Au-TiO sub(2)/Chit modified sensor for electrochemical detection of trace organophosphates insecticides

• Published in: Talanta (Oxford) Vol. 76; no. 4; pp. 758 - 762
• Main Authors: Qu, Yunhe, Min, Hong, Wei, Yinyin, Xiao, Fei, Shi, Guoyue, Li, Xiaohua, Jin, Litong
• Format: Journal Article
• Language: English
• Published: 01-08-2008
• Subjects: Indexing in process; Q1
• ISSN: 0039-9140
• DOI: 10.1016/j.talanta.2008.04.045

In this paper, Au-TiO sub(2)/Chit modified electrode was prepared with Au- TiO sub(2) nanocomposite (Au-TiO sub(2)) and Chitosan (Chit) as a conjunct. The Au-TiO sub(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 sub(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 sub(2)/Chit modified electrode were linear with parathion concentration ranging from 1.0 ng/ml to 7.0 x 10 super(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.