A model of the breakdown of dichlorvos on grain

Abstract

Predictive models of decay of dichlorvos residues and dichlorvos vapour concentrations were compared with breakdown observed in grain stored in six railway trucks and four commercial silos. Decay rates were adequately modelled by simple kinetic treatments and no variations in rate of decay caused by possible saturation of grain enzymes were observed. The discrepancies in various reported models for decay of dichlorvos may be due to pronounced differences in surface effects observed in commercial and laboratory applications.