2,6-Difluorobenzoic acid, one of the two primary dijlubenzuron metabolites, is rapidly and completely degraded in soil. Times to 50 % disappearance were 9 and 12 days in two agricultural soils. [14C]Carbon dioxide was an ultimate product of the ring-14C-labelled compound. A part of the radioactivity, increasing with time to one third of the applied dose of I mg k g -' , could not be extracted ffom the soil.
The fate of 4‐chlorophenylurea in soils was studied with two preparations: one labelled with 14C in the phenyl ring and the other in the carbonyl group. The initial dose of 1 mg kg−1 decreased 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 [14C]carbon 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 4‐chlorophenylurea.
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