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Redox Properties of Structural Fe in Ferruginous Smectite. A Discussion of the Standard Potential and its Environmental Implications

Published online by Cambridge University Press:  01 January 2024

Fabienne Favre ,
Joseph W. Stucki  and
Pascal Boivin
Fabienne Favre
Affiliation:
Laboratory of Soil Science, LPE-ISTE-ENAC, Swiss Federal Institute of Technology, 1015 Lausanne, Switzerland
Joseph W. Stucki
Affiliation:
Department of Natural Resources and Environmental Sciences, University of Illinois, W-321 Turner Hall, 1102 South Goodwin Avenue, Urbana, IL 61801, USA
Pascal Boivin*
Affiliation:
IRD, Laboratoire d’étude des Transferts en Hydrologie et Environnement LTHE, Université J. Fourier, B.P. 53, 38041 Grenoble Cedex 9, France
*
*E-mail address of corresponding author: [email protected]
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Abstract

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The aim of this study was to compare the redox properties of oxides and smectite structural Fe (FeStr). Structural Fe in smectite often accounts for about half of the Fe pool in soils and sediments, and is naturally reduced by indigenous bacteria. This reaction is, however, seldom taken into account in environmental studies. The equation for the oxidation-reduction of FeStr and its application to the calculation of the standard electrode potential of FeStr, E0, are discussed on the basis of literature review. The resulting redox properties were used in a new analysis of previously reported field monitoring data. This agreed well with experimental observations that remained unexplained, and showed that if equilibrium conditions prevail, the FeStr pool in soils will reduce prior to the Fe in oxides. The FeStr pool is, therefore, likely to play a major role in controlling the bio-geochemistry of temporarily water-logged soils, and this reaction should be taken into account in further studies.

Keywords

GoethiteOxidesReductionSmectiteStandard PotentialStructural Fe
Type
Research Article
Information
Clays and Clay Minerals , Volume 54 , Issue 4 , August 2006 , pp. 466 - 472
Copyright
Copyright © 2006, The Clay Minerals Society

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