The three electrode system was used to detect the pesticide fenitrothion (C9H12NO5PS. MW=277.24) using cyclic voltammetry (CV) and square wave anodic stripping voltammetry (SWASV). The working electrode was mercury immobilized on a carbon nanotube paste electrode (Hg-CNTPE). At the optimized condition, the limit of detection (LoD) was 0.6 ppt (2.16×10 -12 M), and the relative standard deviation was 0.035% (n=15). And there is more sensitive in detecting fenitrothion than common type carbon nanotube paste electrode. When it was implanted into the brain of live fish (carp), the existence of fenitrothion was measured without any destruction or damage of tissue.

Abstract
 1. Introduction
 2. Experiment
  2.1. Apparatus, reagents and experimental procedure
 3. Results and Discussion
  3.1. Electrode comparison using CV
  3.2. Experimental optimization for various parametersof square-wave stripping voltammogram
  3.3. Interference test
 4. Linear Working Ranges, Statistics and Application
 5. Conclusions
 References

• Chang-Hyun Lee(Division of General Education, Pyeongtaek University) Corresponding Author
• Suw-Young Ly(Biosensor Research Institute,Seoul National University of Technology)