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Hydrolysis and Decomposition of Calcium Montmorillonite¹

ABSTRACT

The extent to which exchangeable calcium hydrolysis occurs during the preparation of homoionic calcium montmorillonite clay and the rate of the reaction in distilled water at various supension concentrations and levels of CO₂ was determined at 25°C. The rate and extent of hydrolysis was found to be comparable to that reported for sodium montmorillonite and increased with CO₂ concentration. CEC was appreciably reduced during washing of residual salts while preparing calcium montmorillonite. The mechanism of hydrolysis is discussed.

¹ Contribution from the ARS, USDA, U.S. Salinity Lab. P.O. Box 672, Riverside, CA 92502.

² Visiting Soil Scientist and Geochemist, respectively.

Received for publication February 7, 1977. Accepted for publication June 22, 1977.