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The effect of aqueous sulphate on basaltic glass dissolution rates

Published online by Cambridge University Press:  05 July 2018

T. K. Flaathen ,
E. H. Oelkers  and
S. Gislason
T. K. Flaathen*
Affiliation:
LMTG-Université de Toulouse-CNRS-IRD-OMP, 14 Avenues Edouard Belin, 31400 Toulouse, France
E. H. Oelkers
Affiliation:
LMTG-Université de Toulouse-CNRS-IRD-OMP, 14 Avenues Edouard Belin, 31400 Toulouse, France
S. Gislason
Affiliation:
Institute of Earth Sciences, University of Iceland, Sturlugata 7, 101 Reykjavík, Iceland
*
*E-mail: flaathen@lmtg.obs-mip.fr
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Abstract

Steady-state dissolution rates of basaltic glass were measured in mixed-flow reactors at 50ºC at pH 3 and 4 as a function of aqueous sulphate concentration. Dissolution rates in the presence of 0.1 moles/kg SO42- were found to be ~3 times greater than those in corresponding SO42- free solutions. This rate increase is found to be approximately consistent with that calculated using a rate equation previously proposed by Gislason and Oelkers (2003). These results suggest that the addition of sulphate to injected CO2 may facilitate CO2 sequestration in basalts by accelerating basaltic glass dissolution rates thus more rapidly releasing aqueous Ca and Mg to solution.

Keywords

basaltic glassdissolution ratesCO2 sequestrationkineticsaqueous sulphate
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 39 - 41
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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References

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