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The Solubility of Gibbsite in Aqueous Solutions and Soil Extracts¹

ABSTRACT

The solubility of gibbsite was determined in supersaturated and undersaturated AlCl₃ solutions as well as in 0.01M CaCl₂ soil extracts. The rate of dissolution of gibbsite in undersaturated solutions was extremely slow. In supersaturated solutions that were seeded with gibbsite, equilibrium was established after 1 to 3 months. The solubility product, expressed as pK_sp, was found to be 33.5 at 25°C., which agrees well with a value of 33.8 calculated from thermodynamic data. Owing to the relatively large amount of adsorbed aluminum ions as compared to that present in solution, the time necessary to reach the solubility product of gibbsite was found to be much longer in a clay or soil suspension than in an aqueous solution having the same pH value.

¹ Agronomy Paper No. 552, Department of Agronomy, Cornell University, Ithaca, New York, in cooperation with the Division of Agricultural Development, Tennessee Valley Authority, Wilson Dam, Ala.

² Formerly Graduate Assistant at Cornell University, now Assistant Soil Chemist, The Connecticut Agr. Exp. Sta., New Haven; and Professor of Soil Science, Cornell University.

Received for publication August 4, 1961. Accepted for publication September 20, 1961.