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Long-term in vitro transformation of 2-line ferrihydrite to goethite/hematite at 4, 10, 15 and 25°C

Published online by Cambridge University Press:  09 July 2018

U. Schwertmann ,
H. Stanjek  and
H.-H. Becher
U. Schwertmann*
Affiliation:
Institute of Soil Science, Technical University of Munich, Freising-Weihenstephan, Germany
H. Stanjek
Affiliation:
Institute of Soil Science, Technical University of Munich, Freising-Weihenstephan, Germany
H.-H. Becher
Affiliation:
Institute of Soil Science, Technical University of Munich, Freising-Weihenstephan, Germany
*
*E-mail: uschwert.@wzw.tum.de
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Abstract

2-line ferrihydrite stored in water at ambient temperatures from 4 to 25°C and at ten different pH values between 2.5 and 12 for up to 10–12 y transformed to both goethite and hematite at all temperatures and pH values except at pH 12 where only goethite was formed. The rate and degree of transformation (20–100%) increased with increasing pH and temperature. The hematite/ (hematite+goethite) ratio varied between 0 and ~0.8, increased with increasing temperature and showed a strong maximum at pH 7–8 which increased from 0.1–0.2 at 4°C to 0.7–0.8 at 25°C. The maximum coincides with the zero point of charge of ferrihydrite where its solubility and, thus, its via-solution transformation rate to goethite are minimal. We assume, therefore, that in this pH-range the (slower) via-solution transformation to hematite can more efficiently compete with that to goethite.

Keywords

ferrihydritegoethitehematitetransformation
Type
Research Article
Information
Clay Minerals , Volume 39 , Issue 4 , December 2004 , pp. 433 - 438
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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