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

¹ Lehrstuhl für Bodenkunde, Technische Universität München, D-85350 Freising, Germany, and ² Geological Survey of Finland, P.O. Box 96, FIN-02151 Espoo, Finland

^* E-mail: USchwert{at}wzw.tum.de

(Received 17 March 2003; revised 28 June 2004)

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: schwertmannite, goethite, transformation, RT, pH, XRD, SEM

This article has been cited by other articles:

				L. E. Davidson, S. Shaw, and L. G. Benning The kinetics and mechanisms of schwertmannite transformation to goethite and hematite under alkaline conditions American Mineralogist, August 1, 2008; 93(8-9): 1326 - 1337. [Abstract] [Full Text] [PDF]