Degradation and sorption of imidacloprid in dissimilar surface and subsurface soils.

Degradation and sorption of imidacloprid in dissimilar surface and subsurface soils. Research Abstract Details 

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Degradation and sorption of imidacloprid in dissimilar surface and subsurface soils. Abstract Text:

Jennifer C Anhalt,Thomas B Moorman,William C Koskinen,

Degradation and sorption/desorption are important processes affecting the leaching of pesticides through soil. This research characterized the degradation and sorption of imidacloprid (1-[(6-chloro-3-pyridinyl)-methyl]-N-nitro-2-imidazolidinimine) in Drummer (silty clay loam) and Exeter (sandy loam) surface soils and their corresponding subsurface soils using sequential extraction methods over 400 days. By the end of the incubation, approximately 55% of imidacloprid applied at a rate of 1.0 mg kg(-1) degraded in the Exeter sandy loam surface and subsurface soils, compared to 40% of applied imidacloprid within 300 days in Drummer surface and subsurface soils. At the 0.1 mg kg(-1) application rate, dissipation was slower for all four soils. Water-extractable imidacloprid in Exeter surface soil decreased from 98% of applied at day 1 to > 70% of the imidacloprid remaining after 400 d, as compared to 55% in the Drummer surface soil at day 1 and 12% at day 400. These data suggest that imidacloprid was bioavailable to degrading soil microorganisms and sorption/desorption was not the limiting factor for biodegradation. In subsurface soils > 40% of (14)C-benzoic acid was mineralized over 21 days, demonstrating an active microbial community. In contrast, cumulative (14)CO(2) was less than 1.5% of applied (14)C-imidacloprid in all soils over 400 d. Qualitative differences in the microbial communities appear to limit the degradation of imidacloprid in the subsurface soils.

Degradation and sorption of imidacloprid in dissimilar surface and subsurface soils. Publishing Authors By Initials

JC Anhalt,TB Moorman,WC Koskinen,

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Degradation and sorption of imidacloprid in dissimilar surface and subsurface soils. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of environmental science and health. Part.

VOLUME: 43

Page Numbers: 207-13

Journal Abbreviation:

ISSN: 0360-1234

DAY: 27

MONTH: 03

YEAR: 2008

Degradation and sorption of imidacloprid in dissimilar surface and subsurface soils. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Degradation and sorption of imidacloprid in dissimilar surface and subsurface soils.

AFFILIATION: Department of Microbiology, Iowa State University, Ames, Iowa, USA.

Country: United States

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MEDLINETA: J Environ Sci Health B

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