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http://dx.doi.org/10.5012/jkcs.2006.50.3.208

Real-time Pesticide Assay on Live Tissue Using Electrochemical Graphite Pencil Electrode  

Lee, Su-Yeong (국립서울산업대학교)
Publication Information
Journal of the Korean Chemical Society / v.50, no.3, 2006 , pp. 208-215 More about this Journal
Abstract
A simply prepared graphite, pencil-type working electrode was utilized to monitor fenitrothion concentrations, using the cyclic voltammetry (CV) and square-wave (SW) stripping voltammetry methods. The optimum conditions for analysis were sought. A very low detection limit was obtained compared to that obtained when other common voltammetry methods are used. The optimal parameters of the pencil-type electrode were found to be as follows: a pH of 3.7, a frequency of 500 Hz, an SW amplitude of 0.1 V, an increment potential of 0.005 V, an initial potential of -0.9V, and a deposition time of 500 sec. The analytical detection limit was determined to be 6.0 ngL-1 (2.16410-11 molL-1) fenitrothion at SW anodic and CV, and the relative standard deviation at the fenitrothion concentration of SW anodic 10 ugL-1 was 0.30% (n = 15) under the optimum conditions. Analysis was directly conducted through in-vivo real-time assay.
Keywords
Pesticide; Fenitrothion; Pencil Type Electrode; Voltammetry; In Vivo
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