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Clays and Clay Minerals; August 2006; v. 54; no. 4; p. 466-472; DOI: 10.1346/CCMN.2006.0540407
© 2006 Clay Minerals Society
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REDOX PROPERTIES OF STRUCTURAL Fe IN FERRUGINOUS SMECTITE. A DISCUSSION OF THE STANDARD POTENTIAL AND ITS ENVIRONMENTAL IMPLICATIONS

Fabienne Favre1, Joseph W. Stucki2 and Pascal Boivin3,*

1 Laboratory of Soil Science, LPE-ISTE-ENAC, Swiss Federal Institute of Technology, 1015 Lausanne, Switzerland
2 Department of Natural Resources and Environmental Sciences, University of Illinois, W-321 Turner Hall, 1102 South Goodwin Avenue, Urbana, IL 61801, USA
3 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: pascal.boivin{at}ird.fr

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.

Key Words: Goethite • Oxides • Reduction • Smectite • Standard Potential • Structural Fe






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