Anodic oxidation of Methidation at boron-doped diamond electrode and degradation mechanism

This paper presents the study of the electrochemical oxidation of the insecticide methidathion organophosphorous pesticide,using a boron-doped diamond (bdd) anode. the influence of current density,sodium chloride concentration,temperature and initial methidathion concentration on the rate of cod abatement has been followed. the electrolyses were performed by using a solution composed of an electrolyte support (2% nacl) and 1.4mm of methidathion. samples were taken during the electrolyses and analysed by uv-vis spectra and chemical oxygen demand (cod). under laboratory conditions,the electrochemical oxidation removed 85% cod of this pesticide with a specific energy consumption of 0.12 kwhgodc-1. the electrochemical oxidation could be used as a pretreatment methode of the pesticides detoxification. in conclusion the degradation mechanism of methidathion was carefully studied based on the formation of free radical.