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Published in Soil Sci Soc Am J 38:429-432 (1974)
© 1974 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Determination of the Solubility Product of Various Iron Hydroxides and Jarosite by the Chelation Method1

P. L. G. Vlek, Th. J. M. Blom, J. Beek and W. L. Lindsay2

ABSTRACT

A modification of the EDTA method of determining ion activities in soil developed by Norvell was used to measure the solubility of various ferric hydroxides. The solubility products of jarosite (KFe3(SO4)2(OH)6) and amorphous Fe(OH)3 were also determined on a natural jarosite nodule taken from an acid sulphate soil.

For amorphous ferric hydroxide and lepidocrocite, the method gave pK° values of 39.02 ± .35 and 42.48 ± .23, respectively. Hematite and goethite were too inert to yield reproducible solubilities.

For a mixture of jarosite and ferric hydroxide, the respective pK° values were 98.56 and 39.93. These values were used to develop an Eh-pH stability diagram that helps to explain the occurrence of jarosite under acid oxidizing conditions in soils.

NOTES

1 Contribution from Department of Soils & Fertilizers, State Agricultural University, Wageningen, The Netherlands.

2 Former Graduate Students, Staff Member, and Visiting Professor, State Agricultural Univ., Wageningen, The Netherlands. The first two authors are presently Graduate Research Assistants at Colorado State University and the University of Guelph, Canada, respectively, and the latter author is Professor of Agronomy, Colorado State University, Fort Collins, Colo. 80521.

Received for publication August 6, 1973. Accepted for publication February 20, 1974.






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