Journal
ENVIRONMENTAL POLLUTION
Volume 132, Issue 3, Pages 541-552Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2004.04.027
Keywords
herbicides; isoproturon; trifluralin; soil adsorption rates; humic substances; gel filtration chromatography
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Isoproturon and trifluralin are herbicides of contrasting chemical characters and modes of action. Standard batch sorption procedures were carried out to investigate the individual sorption behaviour of C-14-isoproturon and C-14-trifluralin in five agricultural soils (1.8-4.2% OC), and the soil solid-liquid partition coefficients (K-d values) were determined. Trifluralin exhibited strong partitioning to the soil solid phase (K-d range 106-294) and low desorption potential, thus should not pose a threat to sensitive waters via leaching, although particle erosion and preferential flow pathways may facilitate transport. For isoproturon, soil adsorption was low (K-d range 1.96-5.75) and desorption was high, suggesting a high leaching potential, consistent with isoproturon being the most frequently found pesticide in UK surface waters. Soil partitioning was directly related to soil organic carbon (OC) content. Accumulation isotherms were modelled using a dual-phase adsorption model to estimate adsorption and desorption rate coefficients. Associations between herbicides and soil humic substances were also shown using gel filtration chromatography. (C) 2004 Elsevier Ltd. All rights reserved.
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