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TECHNICAL REPORTS
Organic Compounds in the Environment

Soil Sorption of Acidic Pesticides

Modeling pH Effects

Soil and Water Science Dep., Univ. of Florida

^* Corresponding author (spadotto{at}cnpma.embrapa.br)

Received for publication December 18, 2000. A model of acidic pesticide sorption in soils was developed from theoretical modeling and experimental data, which initially considered a combination of a strongly acidic pesticide and a variable-charge soil with high clay content. Contribution of 2,4-D [(2,4-dichlorophenoxy) acetic acid] anionic-form sorption was small when compared with molecular sorption. Dissociation of 2,4-D was not sufficient to explain the variation in K_d as a function of pH. Accessibility of soil organic functional groups able to interact with the pesticide (conformational changes) as a function of organic matter dissociation was proposed to explain the observed differences in sorption. Experimental 2,4-D sorption data and K_oc values from literature for flumetsulam [N-(2,6-difluorophenyl)-5-methyl [1,2,4] triazolo [1,5-a] pyrimidine-2-sulfonamide] and sulfentrazone [N-[2,4-dichloro-5-[4-(difluromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-y1] phenyl] methanesulfonamide] in several soils fit the model.

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JEQ 2003 32: 745-750. [Full Text]  

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