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Competitive adsorption-desorption kinetics of phenoxyacetic acids and a chlorophenol in volcanic soil

, : Competitive adsorption-desorption kinetics of phenoxyacetic acids and a chlorophenol in volcanic soil. Environmental Technology 18(9): 937-943, Sept

Competitive adsorption and desorption kinetic experiments with 2,4-dichlorophenoxyacetic acid (2,4-D), 2-methyl-4-chlorophenoxyacetic acid (MCPA) and para-chloro-ortho-cresol in a volcanic soil clearly demonstrated that the rate of diffusion in mixtures of these chemicals are different compared to single solute values and therefore the assumption of single diffusion coefficient values may not be valid in many realistic situations. In the present article, the experimental data obtained from the batch reactor were compared with numerical calculations of a homogeneous surface diffusion model, developed for bicomponent systems. The model used the single component Freundlich parameters and the competition coefficients from bicomponent sorption experiments. The results showed that the adsorption surface diffusion coefficients were smaller by 12, 4 and 6% for 2,4-D, MCPA and PCOC, respectively, while for desorption they were smaller by 4-8%, which is attributed to competition between the solutes. In general, good agreement between the numerical and experimental results was obtained for all cases considered.


DOI: 10.1080/09593331808616613

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