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The Instability of Neutralized H, Al-Bentonites¹

ABSTRACT

It is well known that the attainment of apparent equilibrium in the titration of acid clays is retarded. This phenomenon is frequently called "the titration lag." Evidence is presented to demonstrate that the retardation is associated with exchangeable A1 in such clays. Hydroxide continued to react for several days with clay which contained appreciable exchangeable A1. The amount of hydroxide neutralized subsequent to titration of an acid bentonite which contained a minimal quantity of exchangeable A1 was small compared with the amounts which reacted with clays which contained larger amounts of exchangeable A1. It is tentatively concluded that Al⁺⁺⁺ ions are in part covalently bonded, have a high activation energy, and react slowly with OH^- ions.

¹ Contribution from the Department of Soils and Plant Nutrition, University of California, Davis.

² Professor and Soil Chemist.

Received for publication April 11, 1960. Accepted for publication June 9, 1960.