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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
Mingelgrin, U., Department of Land, Air and Water Resources, University of California, Davis, CA 95616, United States, Agricultural Research Organization, Volcanie Center, Institute of Soils and Water, Bet-Dagan, Israel
Biggar, J.W., Department of Land, Air and Water Resources, University of California, Davis, CA 95616, United States
The desorption of picloram from Palouse silt, parathion from Panoche clay loam, and parathion from Palouse silt loam was investigated using a flow system. The desorption-kinetic reaction constant, k0′, was calculated from the specific desorption, (x/m)d, as a function of time. The k0′ values at 25 °C are 0.457, 0.099, and 0.011 for the above three soil-pesticide systems, respectively. Activation parameters for each system were evaluated. The activation energy, Ea, is 8.6, 8.2, and 3.0 kcal/mol for these three systems, respectively. The standard enthalpy for the equilibrium adsorption is compared with the enthalpies of activation for the kinetic adsorption and desorption processes. The interpretation of the activation parameters for each system was supplemented by X-ray diffraction data. Hypotheses concerning the mechanisms involved in the desorption process for these chemicals in these soils are discussed. © 1979 American Chemical Society.
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Equilibrium and kinetics of desorption of picloram and parathion in soils
27
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
Mingelgrin, U., Department of Land, Air and Water Resources, University of California, Davis, CA 95616, United States, Agricultural Research Organization, Volcanie Center, Institute of Soils and Water, Bet-Dagan, Israel
Biggar, J.W., Department of Land, Air and Water Resources, University of California, Davis, CA 95616, United States
Equilibrium and kinetics of desorption of picloram and parathion in soils
The desorption of picloram from Palouse silt, parathion from Panoche clay loam, and parathion from Palouse silt loam was investigated using a flow system. The desorption-kinetic reaction constant, k0′, was calculated from the specific desorption, (x/m)d, as a function of time. The k0′ values at 25 °C are 0.457, 0.099, and 0.011 for the above three soil-pesticide systems, respectively. Activation parameters for each system were evaluated. The activation energy, Ea, is 8.6, 8.2, and 3.0 kcal/mol for these three systems, respectively. The standard enthalpy for the equilibrium adsorption is compared with the enthalpies of activation for the kinetic adsorption and desorption processes. The interpretation of the activation parameters for each system was supplemented by X-ray diffraction data. Hypotheses concerning the mechanisms involved in the desorption process for these chemicals in these soils are discussed. © 1979 American Chemical Society.
Scientific Publication
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