Influence of Cosolvent (Acetone) on the Adsorption of Cypermethrin at High Concentrations on Soils

Adsorption of cypermethrin on three different types of uncontaminated soils in acetone-water mixtures at different f_s values has been studied by batch shake technique. Higher adsorption of cypermethrin was observed on silt clay loam soil followed by loam and sandy loam soils and was anticipated with Freundlich adsorption constant K values and partition coefficient K_D values. The K and K_D values also confirmed that adsorption of cypermethrin decreased with increase in f_s values and the decreased cypermethrin adsorption in acetone-water mixtures meant a greater potential of ground water contamination through leaching from potential sites. The data have been used to evaluate the cosolvent theory for describing adsorption of cypermethrin in acetone-water mixtures. The aqueous phase partition coefficient K_DW (mol g⁻¹) normalised on f_OC for cypermethrin was evaluated by extrapolating f_s = 0