Co-Authors:
Biggar, J.W., Department of Land, Air and Water Resources, University of California, Davis, CA 95616, United States
Mingelgrin, U., Department of Land, Air and Water Resources, University of California, Davis, CA 95616, United States
Cheung, M.W., Department of Land, Air and Water Resources, University of California, Davis, CA 95616, United States, CIBA-GEIGY Corporation, Greensboro, NC 27409, United States
Abstract:
The kinetics of adsorption of pesticides on soils is examined utilizing a flow-type system. The pesticide-soil systems included picloram and parathion reacting with Palouse silt loam and Panoche clay loam. Values-of the relative adsorption constant, k0, which is independent of the initial solution concentration, flow rate, and soil mass at 25 °C were 0.644, 0.441, 0.546, and 0.359 for the reactions picloram with Palouse silt, parathion with Panoche clay, parathion with Palouse silt, and picloram with Palouse silt acidified to pH 3, respectively. From the temperature dependence of k0, the activation energies, Ea, were 2.7, 1.3, and 4.3 kcal/mol for the first three systems. Mechanisms of interaction based on experimental results and thermodynamic considerations emphasize the importance of organic matter for picloram adsorption and both clay and organic matter in the adsorption of parathion. Properties of the pesticides, and the soil components were considered in-proposing the mechanisms. © 1978 American Chemical Society.
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