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Reanalysis of experiments to quantify irreversibility of pesticide sorption-desorption in soil.

Authors
  • Suddaby, Laura A
  • Beulke, Sabine
  • van Beinum, Wendy
  • Celis, Rafael
  • Koskinen, William C
  • Brown, Colin D
Type
Published Article
Journal
Journal of Agricultural and Food Chemistry
Publisher
American Chemical Society
Publication Date
Mar 06, 2013
Volume
61
Issue
9
Pages
2033–2038
Identifiers
DOI: 10.1021/jf304422n
PMID: 23387992
Source
Medline
License
Unknown

Abstract

Previously published research used an isotope-exchange technique to measure irreversibility of pesticide sorption-desorption in soil. Results indicated significant irreversibility (6-51%) in sorption in five pesticide-soil systems measured over 72 h. Here, we propose a three-site model to reanalyze the experimental data. The model adds a slow but reversible binding on nonequilibrium sorption sites in addition to instantaneously reversible sites and irreversible sites. The model was able to match experimental data very closely, but only if irreversible sorption was assumed to be absent. Observed asymmetry in the binding of (12)C- and (14)C-pesticide was explained on the basis of nonattainment of sorption equilibrium over the study period. Results suggest that irreversible sorption may be less significant than previously considered with important implications for understanding the fate of pesticides applied to soil.

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