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Lithium-Calcium Exchange Equilibria in Soils and Clays¹

ABSTRACT

Cation-exchange equilibria at pH 7 were determined for a number of soils and clays using Li adsorption ratios (LAR) of 0.2 to 20 (mmoles/liter). Data for montmorillonite and montmorillonitic soils gave linear relationships between exchangeable Li ratio (ELR), or ratio of exchangeable Li to exchangeable Ca, and LAR; similar slopes were obtained in all cases. However, relationships between ELR and LAR for kaolinite and kaolinitic soils were all curvilinear with a relatively high adsorption affinity for Li at low Li concentrations, indicating that this high affinity for Li existed only in a small fraction of the cation-exchange capacity of these materials. Drying in a Li-saturated form increased the affinity of kaolinite for Li but had only a small effect on montmorillonite.

¹ Contribution from the Dep. of Soils & Plant Nutrition University of California, Riverside.

² Laboratory Technician and Professor of Soil Science, respectively.

Received for publication October 10, 1967. Accepted for publication February 5, 1968.