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Formation of hydroxysulphate and hydroxycarbonate green rusts in the presence of zinc using time-resolved in situ small and wide angle X-ray scattering

Published online by Cambridge University Press:  05 July 2018

I. A. M. Ahmed ,
S. Shaw  and
L. G. Benning
I. A. M. Ahmed*
Affiliation:
School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
S. Shaw
Affiliation:
School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
L. G. Benning
Affiliation:
School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
*
*E-mail: i.ahmed@see.leeds.ac.uk
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Abstract

The formation and transformation of hydroxysulphate (GRSO4) and hydroxycarbonate (GRCO3) Green Rusts were studied in situ using synchrotron-based time-resolved small and wide angle X-ray scattering. The time-resolved data revealed, for the first time, the pH dependent transition from poorly-ordered schwertmannite (pH <6.5) into GRSO4 (pH ~6.8) followed by GRCO3 (at pH ~9.6). These data also showed that the addition of Zn to the starting sulphate Fe2+/Fe3+ solution resulted in a change in size of the GR unit-cell due to substitution of Zn into the GR structure.

Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 159 - 162
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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