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Macro- to nanoscale study of the effect of aqueous sulphate on calcite growth

Published online by Cambridge University Press:  05 July 2018

A. I. Vavouraki ,
C. V. Putnis ,
A. Putnis ,
E. H. Oelkers  and
P. G. Koutsoukos
A. I. Vavouraki*
Affiliation:
Department of Chemical Engineering, University of Patras, Karatheodori 1, 26500 Rio, Patras, Greece Institute of Chemical Engineering and High Temperature Chemical Processes, Stadiou Str., Platani, P.O. Box 1414, GR-26504, Patras, Hellas, Greece Géochimie et Biogéochimie Expérimentale, Université Paul Sabatier, CNRS-UMR 5563, 14 rue Edouard Belin, 31400 Toulouse, France
C. V. Putnis
Affiliation:
Institut für Mineralogie, Westfälische Wilhelms, Universität Münster, Corrensstr. 24, D-48149 Münster, Germany
A. Putnis
Affiliation:
Institut für Mineralogie, Westfälische Wilhelms, Universität Münster, Corrensstr. 24, D-48149 Münster, Germany
E. H. Oelkers
Affiliation:
Géochimie et Biogéochimie Expérimentale, Université Paul Sabatier, CNRS-UMR 5563, 14 rue Edouard Belin, 31400 Toulouse, France
P. G. Koutsoukos
Affiliation:
Department of Chemical Engineering, University of Patras, Karatheodori 1, 26500 Rio, Patras, Greece Institute of Chemical Engineering and High Temperature Chemical Processes, Stadiou Str., Platani, P.O. Box 1414, GR-26504, Patras, Hellas, Greece
*
*E-mail: kvavouraki@chemeng.upatras.gr
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Abstract

Calcite growth rates were measured in the presence of sulphate using mixed-flow reactors and in situ Atomic Force Microscopy. Preliminary observations reveal that the kinetics and mechanism of the calcite growth was altered by the presence of sulphate. Calcite growth rates in the presence of sulphate (≥ mM) were decreased and two-dimensional nuclei tend to grow on top of existing nuclei, rather than spreading. The height of new nuclei was ~4 Å, 1 Å greater than that of pure calcite growth. This difference reflects the incorporation of tetrahedral SO2-4 anions into the calcite lattice.

Keywords

calcitesulphatecrystal growthmixed-flow reactorsAtomic Force MicroscopyAFM
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 141 - 144
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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