01402naa a2200181 a 450000100080000000500110000800800410001910000200006024501220008026000090020252008560021165000160106765000260108365000070110965000130111670000190112977300720114810150982019-01-07       2003    bl uuuu     u00u1 u    #d1 aSPADOTTO, C. A.  aOrganic compounds in the environmentbsoil sorption of acidic pesticides: modeling pH effects.h[electronic resource]  c2003  aA 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 Kd 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 Koc values from literature for flumetsulam [N-(2,6-difluorophenyl)-5-methyl [1,2,4] triazolo [1,5-a] pyrimidine-2-sulfonamide] and sulfentrazone  aAgrotóxico  aModelo de simulação  aPh  aSorção1 aHORNSBY, A. G.  tJournal of Environmental Quality, Madisongv. 32, p. 949-956, 2003.