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Test of a New Model for the Kinetics of Adsorption-Desorption Processes¹

ABSTRACT

A new model for the kinetics of adsorption-desorption processes proposed by Lindstrom, Haque, and Coshow (1970) was tested with adsorption and desorption data for the interaction of phosphate with the calcite mineral surface. The model was found to offer considerable advantages in speed and convenience to those users whose experimental conditions correspond to the assumptions inherent in the derivation of the model. There was reasonable agreement between the predicted adsorption kinetic parameters and experimental data. However, considerable disparity was observed between predicted and experimental desorption parameters. It was concluded that the model was not valid for endothermic processes.

¹ Contribution from the Dep. of Soils and Biometeorology, Utah State Univ., Logan, Utah 84322. This work was partly supported through the US/IBP Desert Biome Program, under Grant no. GB 15886 from the National Science Foundation. Published with the approval of the Director, Agr. Exp. Sta. as Journal Paper 1763.

² Post-doctoral Fellow and Professor of Soil Chemistry, respectively. The senior author is currently Research Associate, Illinois Geologic Survey, Urbana, Illinois 61801.

Received for publication June 4, 1973. Accepted for publication August 15, 1973.