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Abstract
The stability of coumaphos [O,O-diethyl O-(3-chloro-4-methyl-2-oxo-2H-1-benzopyran-7 yl)phosphorothioate] was studied in model dipping vats under field conditions using 14C-labelled and unlabelled coumaphos, with or without additives. The stability of coumaphos in model vats increased significantly by maintaining a pH of 5 by addition of superphosphate. Copper sulphate amendment did not seem to have any additional effect on stability. Potasan was the major metabolite in addition to chlorferon and 4-methylumbelliferone. Coumaphos concentration was doubled in the sediment of vat treated with copper sulphate as compared to the control vat as a result of emulsion breakdown.
Chlorferon was the only metabolite detected in the sediment of the former vat indicating inhibition of the anaerobic degradation.
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ACKNOWLEDGMENTS
This work was partly supported by the IAEA Research Contract No. 7032/RB/R3. Thanks are due to Dr. Walter Mulbry (Soil microbial systems laboratory, USDA/ARS, Beltsville, MD 20705) for the generous gift of standards of coumaphos and its metabolites. Coumaphos formulation Asuntol 20% EC was a gift from Dr. J. Espinosa-Gonzalez, Instituto de Investigasion, Panama.