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Rubidium-Sodium Exchange on Kaolinite and Bentonite¹

ABSTRACT

Experimental data on the exchange between Rb and Na on kaolinite and bentonite clays were examined in terms of the exchange equation of Heald et al. The results could be interpreted in terms of a single selectivity factor, describing the relative tendencies of the two ions to form ion pairs with the charge on the clay surface when it was assumed that the amount of each ion present in the form of ion pairs was a constant fraction of the total amount of that ion present.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA, Beltsville, Md. This investigation was supported in part by the U.S. Atomic Energy Commission.

² Soil Scientists

Received for publication April 17, 1967. Accepted for publication November 15, 1967.