Degradation of monocrotophos in 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 μg g −1 soil under aerobic conditions at 60% water-holding capacity at 28 ± 4 °C was studied...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2006, Vol.62 (3), p.396-403
Main Authors: Gundi, Vijay A.K.B., Reddy, B.R.
Format: Article
Language:English
Subjects:
Abiotic depletion
agricultural soils
Agriculture
Applied sciences
biodegradation
Biodegradation, Environmental
Biological and physicochemical properties of pollutants. Interaction in the soil
degradation
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Enhanced biodegradation
environmental fate
Environmental Pollution - analysis
Exact sciences and technology
Half-life
India
insecticide residues
Kinetics
monocrotophos
Monocrotophos - analysis
N-methylacetoacetamide
Persistence
Pollution
Pollution, environment geology
red Alfinsols
Soil - analysis
Soil - standards
Soil and sediments pollution
soil microorganisms
Soil Pollutants - analysis
soil pollution
Soils
Vertisols
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Summary: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 μg g −1 soil under aerobic conditions at 60% water-holding capacity at 28 ± 4 °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 μg 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 μg g −1 soil. Both biotic and abiotic factors were involved in degradation of monocrotophos in soils.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2005.04.076