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Determination of Porewater Chemistry in Compacted Bentonite

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 between groundwater and compacted sodium bentonite (Volclay MX-80). The solutions used were the fresh and saline groundwater simulants. The experiments were carried out in aerobic and anaerobic conditions at elevated temperature. Of main interest in the present study were the chemical changes in the reacting solution, bentonite porewater. and bentonite itself. The results for major cations display a principal difference between the interactions with fresh and saline solutions, while the differences between aerobic and anaerobic conditions within each solution case seem to be minor. The experimental results for the bentonite-water equilibria were interpreted in terms of a multi-site surface complexation model and the computer program HYDRAQL. The apparent diffusivities for sodium and sulphate in bentonite samples sandwiched between two filterplates were also determined.

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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