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Incorporation of Cr, Mn and Ni into goethite (α-FeOOH): mechanism from extended X-ray absorption fine structure spectroscopy

Published online by Cambridge University Press:  09 July 2018

Balwant Singh ,
D. M. Sherman ,
R. J . Gilkes ,
M. A. Wells  and
J . F. W. Mosselmans
Balwant Singh*
Affiliation:
School of Land, Water and Crop Sciences, The University of Sydney, Sydney, Australia
D. M. Sherman
Affiliation:
Department of Earth Sciences, University of Bristol, Bristol, UK
R. J . Gilkes
Affiliation:
Department of Soil Science & Plant Nutrition, University of Western Australia, Nedlands Australia
M. A. Wells
Affiliation:
Mineral Mapping Technology Group, CSIRO Exploration and Mining, Australian Resource Research Centre (ARRC), Kensington Western Australia
J . F. W. Mosselmans
Affiliation:
CCLRC, Daresbury Laboratory, Warrington UK
*
*E-mail: b.singh@acss.usyd.edu.au
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Abstract

The crystal-chemical mechanisms by which transition metals are associated with goethite are fundamental to our understanding of the solubility and bioavailability of micronutrients and heavy metals in soils, and in the formation of laterite ore deposits. Transition metals such as Cr, Mn and Ni may sorb onto goethite by forming surface precipitates, surface complexes or by replacing Fe3+ in the goethite structure. In the work reported here, we investigated the local coordination environment of Cr, Mn and Ni in synthetic goethite using EXAFS spectroscopy. We demonstrate the isomorphous substitution for Fe3+ by Cr3+ (up to 8 mol.%), Mn3+ (up to 15 mol.%) and Ni2+ (up to 5 mol.%). We find, however, that the next-nearest-neighbour coordination environment changes with composition. The perturbations are likely to be responsible for limiting the accommodation of Cr3+, Mn3+ or Ni2+ in the FeOOH structure.

Keywords

goethitemetal substitutionMnCrNiEXAFS

Information

Type
Research Article
Information
Clay Minerals , Volume 37 , Issue 4 , December 2002 , pp. 639 - 649
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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