AbstractThe fate of 4‐chlorophenylurea in soils was studied with two preparations: one labelled with14C in the phenyl ring and the other in the carbonyl group. The initial dose of 1 mg kg−1decreased to 50 in about 5 weeks in aerobic sandy clay and in about 16 weeks in anaerobic hydrosoil. Soil treatment with each of the preparations resulted in the release of 14Ccarbon dioxide, pointing to decarbonylation and ring opening. The fraction of non‐extractable (soil‐bound) radioactivity increased during incubation. Quantities of ring‐14C‐labelled and carbonyl‐14C‐labelled bound residues differed strongly in the aerobic soil but only slightly in the anaerobic hydrosoil. It is assumed that two sorts of bound residues are formed from 4‐chlorophenylurea: one is fairly stable and might consist of bound 4‐chloroaniline or its transformation products, whereas the other is presumed to be a degradable derivative of
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