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Free Energy of Formation of Beidellite from Apparent Solubility Measurements

Published online by Cambridge University Press:  01 July 2024

U. K. Misra  and
W. J. Upchurch
U. K. Misra
Affiliation:
Department of Agronomy, University of Missouri, Columbia, MO 65201, U.S.A.
W. J. Upchurch*
Affiliation:
Department of Agronomy, University of Missouri, Columbia, MO 65201, U.S.A.
*
†Research Associate and Associate Professor of Agronomy, respectively.
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Abstract

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The structural formula for K and Mg saturated beidellite was calculated from the total elemental analysis of the < 0.2 μm clay fraction of the B2t horizon of a Mexico soil. The free energies of formation (ΔGfo) of K-beidellite and Mg-beidellite as determined from their apparent solubilities were -2491.3 and -2484.0 ± 3.2 kcal per mole, respectively. The free energies of formation correspond to a clay mineral structure calculated on the basis of a 24 oxygen cell.

Type
Research Article
Information
Clays and Clay Minerals , Volume 24 , Issue 6 , December 1976 , pp. 327 - 331
Copyright
Copyright © 1976 The Clay Minerals Society

Footnotes

*

Contribution from the Missouri Agr. Exp. Sta., Journal Series Number 7087.

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