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Published in Soil Sci Soc Am J 41:718-721 (1977)
© 1977 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Influence of Exchangeable Cation on the Sorption of Trace Amounts of Cadmium by Montmorillonite1

J. García-Miragaya and A. L. Page2

ABSTRACT

The effect of different exchangeable cations on the sorption of trace amounts of Cd by montmorillonite (clay fraction, Upton, Wyoming) was studied by equilibrating samples of homoionic clay suspensions with CdCl2 solutions ranging from 15 to 120 µg Cd/liter. These Cd concentrations are similar to those found in natural and contaminated soil-water systems. The amount of Cd sorbed on the montmorillonite surfaces depended on the kind of exchangeable cation, decreasing in the order Na-montmorillonite > K-montmorillonite > Ca-montmorillonite > Al-montmorillonite. Exchangeable Al was found to be particularly effective in reducing Cd sorption by high energy sites on montmorillonite.

NOTES

1 Contribution of the Dep. of Soil Sci. and Agric. Eng., Univ. of California, Riverside, CA 92502, and Centro de Ecología, Instituto Venezolano de Investigaciones Científicas (IVIC), Apdo. 1827, Caracas, Venezuela.

2 Former graduate student and Professor of Soil Science, University of California, Riverside, respectively. Part of senior author's thesis for partial fulfillment of the Ph.D. degree requirements at the Univ. of California, Riverside. Senior author's present address is: Centro de Ecología, I.V.I.C., Apdo. 1827, Caracas 101, Venezuela.

Received for publication September 17, 1976. Accepted for publication March 23, 1977.






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Copyright © 1977 by the Soil Science Society of America.