Metal ion promoted degradation mechanism of chlorpyrifos and phoxim

Abstract This study evaluate the degradation of the two organophosphorus pesticides: chlorpyrifos and phoxim in the presence of Ag + at fixed initial concentration and temperature. Chlorpyrifos and phoxim were used as model compounds to develop experimental methods for the investigation of kinetic and degradation pathways. In order to determine what metabolites will be formed after degradation we used 31 P NMR. Chlorpyrifos and phoxim were found to degrade in the presence of Ag + and the result shown in lower chlorpyrifos to Ag + ratio ( + followed first-order exponential decay kinetics, and the half-life ( t 1/2 ) of chlorpyrifos and phoxim are 693 and 1155, respectively.