Atomic energy

Abstract

The apparent thermodynamic properties for the adsorption/desorption of carbaryl by a river sediment were studied using a modified Freundlich isotherm. The values of the apparent adsorption/desorption equilibrium constant, K’, apparent adsorption free energy, ΔG’, apparent rate constant for the desorption reaction, kd, and the apparent lifetime of the adsorbed state, τad, obtained were 43±10, –9.3±0.6 Kj.mole-1, (3.0±0.7)109 s-1 and (3.5±0.7)10-10 s respectively. Possible implications of these properties on the environmental persistence of the pesticide in the aquatic environment are discussed.