Sorption and desorption behaviour of acetochlor in surface, subsurface and size-fractionated soil

Taylor, J.P. and Mills, M.S. and Burns, R.G. (2004) Sorption and desorption behaviour of acetochlor in surface, subsurface and size-fractionated soil. EUROPEAN JOURNAL OF SOIL SCIENCE, 55 (4). pp. 671-679. ISSN 1351-0754. (The full text of this publication is not available from this repository)

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Abstract

Pesticides leaching through a soil profile will be exposed to changing environmental sorption and desorption conditions as different horizons with distinct physical and chemical properties are encountered. Soil cores were taken from a clay soil profile and samples taken from 0.0 to 0.3 m (surface), 1.0-1.3 m (mid) and 2.7-3.0 m (deep) and treated with the chloroacetanilide herbicide, acetochlor. Freundlich isotherms revealed that sorption and desorption behaviour varied with each depth sampled. As soil depth increased, the extent and strength of sorption decreased, indicating that the potential for leaching was increased in the subsoils compared with the surface soil. Hysteresis was evident at each of the three depths sampled, although no significant correlations between soil properties and the hysteresis coefficients were evident. Desorption studies using soil fractions with diameters of > 2000, 250-2000, 53-250, 20-53, 2-20, 0-2 and 0-1 mum separated from each of the three soil depths showed that differential desorption kinetics occurred and that the retention of acetochlor significantly correlated (R-2 = 0.998) with organic matter content. A greater understanding of the influence of soil components on the overall sorption and desorption potential of surface and subsurface soils is required to allow accurate prediction of acetochlor retention in the soil. In addition, it is likely that the proportion of each size fraction in a soil horizon would influence acetochlor bioavailability and movement to groundwater.

Item Type: Article
Additional information: Article 868NX English Times Cited:7 Cited References Count:35
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences
Depositing User: Sue Davies
Date Deposited: 10 Sep 2008 14:31
Last Modified: 14 Jan 2010 14:25
Resource URI: http://kar.kent.ac.uk/id/eprint/6741 (The current URI for this page, for reference purposes)
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