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Gibbsite-Kaolinite Equilibria¹

ABSTRACT

In order to help determine if the equilibria reached by soil mineral mixtures is that predicted on the basis of single minerals, two kaolinite samples were equilibrated individually and also with gibbsite of known stability. One set of samples was equilibrated from undersaturation, the other from supersaturation. Samples were analyzed periodically and equilibrium values obtained by extrapolation to infinite time. The solution ion compositions found were those predicted on the basis of the solubilities of the individual minerals.

¹ Scientific paper no. 2775, Coll. of Agr., Washington State Univ., Pullman, Proj. 1489. Presented before a joint meeting of Div. S-2 and S-5, Soil Sci. Soc. of Amer., Columbus, Ohio, Nov. 1, 1965.

² Associate Professor of Soils and Associate Soil Scientist, Agronomy Dep., Washington State Univ., Pullman.

Received for publication November 3, 1966. Accepted for publication November 9, 1966.