Abstract
The adsorption of carbofuran on three different types of uncontaminated Indian soils (loam, silt clay loam, sandy loam) at various volume fractions (0.25, 0.50, 0.75, 1.0) of methanol (fS) has been studied by the batch shake technique. The adsorption of carbofuran was higher on loam soil, followed by silt clay loam and sandy loam soils, and decreased with increasing fS values on all soils. From the adsorption data, adsorption partition coefficients KD (ml/g) were evaluated and the KD values converted to mole-based partition coefficients Km (mol/g). These values were utilised to test the cosolvent theory. The Km values for soils, when normalised on foc, gave values of Kmoc, and a plot of log Kmoc versus fS resulted in a single line whose equation was determined by linear regression analysis as log Kmoc = –1.12 + 2.84; r2 = 0.96. The aqueous phase partition coefficient KDw (mol/g) normalised on f∞ for carbofuran extrapolated from this relationship was 4.1, The slope may be related to the effect of carbofuran solubility and to carbofuran–soil and solvent–soil interactions. The data presented suggested that methanol–soil interaction may not increase the accessibility of carbofuran to soil organic matter to the same extent as reported for less hydrophobic organic solutes.
Published Version
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