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Evolution of the Porewater Chemistry in Compacted Bentonite

Published online by Cambridge University Press:  10 February 2011

Arto Muurinen  and
Jarmo Lehikoinen
Arto Muurinen
Affiliation:
VTT Chemical Technology, P.O. Box 1404, FIN-02044 VTT, Finland
Jarmo Lehikoinen
Affiliation:
VTT Chemical Technology, P.O. Box 1404, FIN-02044 VTT, Finland
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Abstract

The evolution of porewater chemistry in bentonite was studied in solution-bentonite interaction experiments under anaerobic conditions at room temperature. The parameters varied were the bentonite density, bentonite-to-water ratio (b/w), ionic strength of the solution, and the composition of bentonite. At the end of the experiment, the equilibrating solution and the porewater squeezed out of the bentonite samples were analysed. This paper presents the preliminary experimental results of these ongoing studies. The evolution of porewater chemistry was determined by the dissolving components initially present in the bentonite together with the ions coming with water from the surroundings. Ion-exchange processes occured between the exchangeable cations of montmorillonite and the cations in the water. The obtained concentrations in the external solution and porewater strongly depended on the b/w used. The concentrations in the squeezed porewaters were clearly lower than in the external waters and decreased with increasing density during squeezing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 506: Symposium – Scientific Basis for Nuclear Waste Management XXI , 1997 , 415
Copyright
Copyright © Materials Research Society 1998

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References

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