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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: [email protected]
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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
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

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