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Application of Solubility Product Principles to the Variscite-Kaolinite System¹

ABSTRACT

The reaction of variscite with H⁺ and OH^- in water solutions was investigated and the [OH^-] exponent in the variscite solubility product expression was found to be dependent upon solution pH, being proportional to [OH^-]² only at pH 4. An increase from 1 to 10 g. of kaolinite to 0.5 g. of variscite in 50-ml. volume increased the aluminum concentration in solution from 2.3 x 10^-5 to 4.8 x 10^-5 molar and diminished the phosphate concentration in solution from 2.5 x 10^-4 to 0.7 x 10^-4 molar in accord with solubility product principles.

¹ This work was supported in part by the University Research Committee through a grant of funds from the Wisconsin Alumni Research Foundation. Presented before Div. II, Soil Science Society of America, Aug. 17, 1955.

² Assistant Professor of Soils, State College of Washington, and Professor of Soils, Univ. of Wisconsin, respectively.

Received for publication February 21, 1955.