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Lead, Cadmium, and Calcium Selectivity Coefficients on a Montmorillonite, Illite, and Kaolinite¹

ABSTRACT

Selectivity coefficients for Pb²⁺, Cd²⁺, and Ca²⁺ exchange adsorption with montmorillonite, illite, and kaolinite clays were determined over a wide range of clay surface concentration and found constant. The average selectivity coefficients describing the ion distributions for montmorillonite, illite, and kaolinite, respectively, were 0.60, 0.44, 0.34 for Pb-Ca exchange, 1.04, 1.01, 0.89 for Cd-Ca exchange and 0.58, 0.56, 0.31 for Pb-Cd exchange. Whereas Cd²⁺ may compete more or less on an even basis with Ca²⁺ for clay adsorption sites, the adsorption of Pb²⁺ would be favored by a factor of 2 or 3 over Ca²⁺.

Key Words: cation adsorption • heavy metals • cation exchange

¹ Supported in part with funds from the Illinois Agr. Exp. Sta. and NSF RANN Grant GI-31605.

² Research Associate and Professor, Dep. of Agronomy, University of Illinois, Urbana 61801. Present address, Dow Coming, Midland, Mich.; Associate Dean and Director, Idaho Agr. Exp. Sta., Univ. of Idaho, Moscow, 83843, respectively.

Received for publication July 13, 1973.

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