Laboratory study for adsorption of selected pesticides on two types of playa basin soils
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The mobility of pesticides through soil following agricultural application is of concern due to the potential threat of groundwater contamination by leaching. The pesticide transport down through the soil into groundwater is affected by many processes taking place in the soil profile. These processes include convection, dispersion, diffusion, adsorption, degradation, volatilization, and plant uptake (Cheng and Koaklnen, 1986). As the understanding of these processes increases, better control of pesticide fates should be expected. This study considers the effects of adsorption of four typical pesticides on two High Plains soils by means of laboratory experiments and mathematical models. Column experiments described by the one-dimensional convective-dlspersive transport equation are used to quantitatively determine the adsorption parameters for the selected pesticides. Batch experiments for adsorption isotherms are also conducted for the comparison with results of the column experiments.