Persistence and degradation of coumaphos in model cattle dipping vats.
The stability of coumaphos [O,O-diethyl O-(3-chloro-4-methyl-2-oxo-2H-1-benzopyran-7 yl)phosphorothioatel 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.
Jindal
Tanu
T
Department of Zoology, University of Delhi, India.
Singh
Dileep K
DK
Agarwal
H C
HC
D000818:Animals; D001673:Biodegradation, Environmental; D002250:Carbon Radioisotopes; D002417:Cattle; D002418:Cattle Diseases / Q000469:parasitology / Q000517:prevention & control; D002855:Chromatography, Thin Layer; D003372:Coumaphos / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007306:Insecticides / Q000378:metabolism*; D010573:Pesticide Residues / Q000032:analysis*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*; D013984:Tick Infestations / Q000469:parasitology / Q000517:prevention & control / Q000662:veterinary
D002250:Carbon Radioisotopes; D007306:Insecticides; D010573:Pesticide Residues; D012989:Soil Pollutants; D003372:Coumaphos