期刊
CHEMOSPHERE
卷 62, 期 3, 页码 396-403出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2005.04.076
关键词
persistence; N-methylacetoacetamide; half-life; enhanced biodegradation; abiotic depletion; soils
The degradation of a widely used organophosphorus insecticide, monocrotophos (dimethyl (E)-1-methyl-2-methylcarbamoyl vinyl phosphate) in two Indian agricultural soils at two concentration levels, 10 and 100 mu g g(-1) soil under aerobic conditions at 60% water-holding capacity at 28 +/- 4 degrees C was studied in a laboratory. The degradation of monocrotophos at both concentrations in black vertisol and red alfinsol soils was rapid accounting for 96-98% of the applied quantity and followed the first-order kinetics with rate constants (k) of 0.0753 and 0.0606 day(-1) and, half-lives (t(1/2)) of 9.2 and 11.4 days, respectively. Degradation of monocrotophos in soils proceeded by hydrolysis with formation of N-methylacetoacetamide. Even three additions of monocrotophos at 10 mu g g(-1) soil did not result in its enhanced degradation. However, there was cumulative accumulation of N-methylacetoacetamide in soils pretreated with monocrotophos to the tune of 7-15 mu g g(-1) soil. Both biotic and abiotic factors were involved in degradation of monocrotophos in soils. (c) 2005 Elsevier Ltd. All rights reserved.
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