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Rubidium-Sodium Exchange on a Weak Acid Resin as Influenced by Ionic Strength¹

ABSTRACT

Changes in the selecrivity coefficient, K₅, for Na-Rb exchange on IRC, a weak acid resin with carboxylie functional groups, were observed when the concentration of the external solution was increased form 10^-3M to 10^-1M. These ionic strength effects on K_s were interpreted in terms of an ion paor-diffuse double layer model. Increasing K_s favoring Rb over Na with increasing ionic strength may be attributed to an increasing fraction of adsorbed isons in the ion-pair form.

Contribution of US Soils Laboraotyr, Soil & Water Conservation research Division, ARS, USDA, Beltsville, Md. This research was supproted in part by the Atomic Energy Commission.

² Research Soil Scientists.

Received for publication December 9, 1968. Accepted for publication February 21, 1969.