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The pH-dependent transformation of schwertmannite to goethite at 25°C

Published online by Cambridge University Press:  09 July 2018

U. Schwertmann  and
L. Carlson
U. Schwertmann*
Affiliation:
Lehrstuhl für Bodenkunde, Technische Universität München, D-85350 Freising, Germany
L. Carlson
Affiliation:
Geological Survey of Finland, P.O. Box 96, FIN-02151 Espoo, Finland
*
*E-mail: USchwert@wzw.tum.de
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Abstract

At 25°C, synthetic schwertmannite, a common iron compound in acid mine drainage, completely converted in water to a sulphate-containing goethite within ~100 days. The rate of transformation doubled as the pH increased from 4.0 to 7.2. In deviation from its normal acicular habit, the goethite appeared as spherical aggregates.

Keywords

schwertmannitegoethitetransformationRTpHXRDSEM

Information

Type
Research Article
Information
Clay Minerals , Volume 40 , Issue 1 , March 2005 , pp. 63 - 66
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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References

Bigham, J.M., Carlson, L. & Murad, E. (1994) Schwertmannite, a new iron oxyhydroxysulphate from Pyhäsalmi, Finland and other localities. Mineralogical Magazine, 58, 641–648.CrossRefGoogle Scholar
Bigham, J.M., Schwertmann, U., Traina, S.J., Winland, R.L. & Wolf, M. (1996) Schwertmannite and the chemical modelling of iron in acid sulfate waters. Geochimica et Cosmochimica Acta, 60, 2111–2121.Google Scholar
Carlson, L., Bigham, J.M., Schwertmann, U., Kyek, A. & Wagner, F. (2002) Scavenging of As from acid mine drainage by schwertmannite and ferrihydrite: A comparison with synthetic analogues. Environmental Science and Technology, 36, 1712–1719.Google Scholar
Gagliano, W.B., Brill, M.R., Bigham, J.M., Jones, F.S. & Traina, S.J. (2004) Chemistry and mineralogy of ochreous sediments in a constructed mine drainage wetland. Geochimica et Cosmochimica Acta, 68, 2119–2128.Google Scholar
Murad, E. & Rojik, P. (2003) Iron-rich precipitates in a mine drainage environment: Influence of pH on mineralogy. American Mineralogist, 88, 1915-1918.Google Scholar
Rietra, R.P.J.J. (1999) Sulphate adsorption on goethite. Journal of Colloid and Interface Science, 218, 511-521.Google Scholar
Ross, S.D. (1974) Sulphates and other oxyanions of group VI. Pp. 423-444, in: The Infrared Spectra of Minerals (Farmer, V.C., editor). Monograph 4, Mineralogical Society, London.Google Scholar
Schwertmann, U. & Cornell, R.M. (2000) Iron Oxides in the Laboratory, 2nd edition. Wiley-VCH, Weinheim, Germany, 188 pp.Google Scholar
Schwertmann, U., Bigham, J.M. & Murad, E. (1995) The first occurrence of schwertmannite in a natural stream environment. European Journal of Mineralogy, 7, 547–552.CrossRefGoogle Scholar