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Solubility Criteria for the Existence of Variscite in Soils¹

ABSTRACT

The pK_sp value of a highly purified synthetic variscite, Al(OH)₂H₂PO₄, was found to be 30.5 at 25° C. The equilibrium between variscite and its constituent ions in solution was attained only very slowly. The solubility criteria obtained in this study would indicate that the immediate reaction products of applied phosphate in acid soils are much more soluble than variscite but, upon ageing, these intermediate reaction products are slowly transformed into variscite which may coexist with gibbsite as stable solid phases.

¹ Joint contribution as Agronomy Paper No. 463 from Department of Agronomy, New York State College of Agriculture, Cornell University, Ithaca, N. Y., and Soils and Fertilizer Research Branch, Div. of Agr. Rel., Tennessee Valley Authority, Wilson Dam, Ala. Presented before Div. II, Soil Science Society of America, Aug. 5, 1958, at Lafayette, Ind.

² Formerly Graduate Assistant, Professor of Soils, and Assistant Professor of Soils, Cornell University; senior author is now Soil Chemist, Soils and Fertilizer Research Branch, Tennessee Valley Authority, Wilson Dam, Ala., and the last-named author is Assistant Professor, University of British Columbia, Vancouver, Canada. Appreciation is expressed to Z. T. Wakefield, J. R. Lehr, and J. P. Smith, Chemists, Division of Chemical Development, Tennessee Valley Authority, for preparation as well as petrographic and X-ray analyses of the variscite used in this investigation.

Received for publication March 10, 1959. Accepted for publication March 20, 1959.