ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 50, Number 3
JKCSEZ 50(3)
June 20, 2006 

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 -0.9 V, and a deposition time of 500 sec. The analytical detection limit was determined to be 6.0 ngL^-1 (2.164×10^-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 realtime assay.