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Determination of Porewater Chemistry in CompactedBentonite

Published online by Cambridge University Press:  03 September 2012

J. Lehikoinen ,
A. Muurinen ,
A. Melamed  and
P. Pitkänen
J. Lehikoinen
Affiliation:
VTT Chemical Technology. P.O. Box 1404, FIN-02044 VTT, Finland
A. Muurinen
Affiliation:
VTT Chemical Technology. P.O. Box 1404, FIN-02044 VTT, Finland
A. Melamed
Affiliation:
VTT Communities and Infrastructure, P.O. Box 19041, FIN-02044 VTT, Finland
P. Pitkänen
Affiliation:
VTT Communities and Infrastructure, P.O. Box 19041, FIN-02044 VTT, Finland
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Abstract

Laboratory experiments were performed to study the interaction betweengroundwater and compacted sodium bentonite (Volclay MX-80). The solutionsused were the fresh and saline groundwater simulants. The experiments werecarried out in aerobic and anaerobic conditions at elevated temperature. Ofmain interest in the present study were the chemical changes in the reactingsolution, bentonite porewater. and bentonite itself. The results for majorcations display a principal difference between the interactions with freshand saline solutions, while the differences between aerobic and anaerobicconditions within each solution case seem to be minor. The experimentalresults for the bentonite-water equilibria were interpreted in terms of amulti-site surface complexation model and the computer program HYDRAQL. Theapparent diffusivities for sodium and sulphate in bentonite samplessandwiched between two filterplates were also determined.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 1011
Copyright
Copyright © Materials Research Society 1997

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References

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