Redox properties of structural Fe in ferruginous smectite. A discussion of the standard potential and its environmental implications
Favre, Fabienne (Swiss Federal Institute of Technology. Laboratory of Soil Science. LPE-ISTE-ENAC)
Stucki, Joseph W. (University of Illinois. Department of Natural Resources and Environmental Sciences)
Boivin, Pascal (Université J. Fourier. IRD. Laboratoire d'Étude des Transferts en Hydrologie et Environnement LTHE)

Data:	2006
Resum:	The aim of this study was to compare the redox properties of oxides and smectite structural Fe (Fes). 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 Fe and its application to the calculation of the standard electrode potential of Fe, E, 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 Fe pool in soils will reduce prior to the Fe in oxides. The Fe 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.
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Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Goethite ; Oxides ; Reduction ; Smectite ; Standard Potential ; Structural Fe
Publicat a:	Clays and Clay Minerals, Vol. 54, Núm. 4 (2006) , p. 466-472, ISSN 1552-8367

DOI: 10.1346/CCMN.2006.0540407

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