KINETIC STUDIES OF THE ADSORPTION AND INTERACTION OF OXAMYL ON ILLITES

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Abstract
We have made kinetic studies of the adsorption of oxamyl on hydrogen-, sodium-, and calcium-saturated illites. The model of Lindstrom et al. proves useful in the simultaneous evalution of adsorption (k1) and desorption (k2) rate constants. The adsorption and desorption data are in agreement with those calculated with the simple kinetic rate laws for separate sorption and desorption processes. Rate constants, activation energies, heats of activation, entropies of activation, along with the thermodynamic parameters, were calculated. The rate constant and other parameters indicated a partly physical and partly chemical type of adsorption of oxamyl on illites. Adsorption may be either by coordination or via protonation of the exchangeable clay cations to the oxygen of the amide group.

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