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Mechanisms for Hydrogen to Aluminum Transformations in Clays¹

ABSTRACT

The rates of Al release from montmorillonite and kaolinite clays by acid-dissolution techniques were determined. For kaolinite the release of Al obeyed pseudo zero order kinetics and form ontmorillonite the release of Al obeyed pseudo first order kinetics. The kinetic studies indicate a difference in mechanism of H attack on these two clays. A diffusion controlled edge attack is proposed in the case of kaolinite and an all surface attack is proposed for montmorillonite. Kinetic studies using different size fractions of the two clays support the proposed mechanisms.

¹ Contribution from the Department of Soil Science, North Carolina Agr. Exp. Sta., Raleigh. Published with the approval of the Director as Paper No. 1834 of the Journal Series. Presented before Div. S-2, Soil Science Society of America, Nov. 19, 1963, at Denver, Colo.

² Assistant Professor. The author expresses his appreciation to Mrs. Bertha Crabree, Chemist, for conducting the chemical determinations.

Received for publication July 15, 1964. Accepted for publication September 24, 1964.