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Diffusion Mecflanisms of Srrontium and Cesium in Compacrtd Sodium Bentonite

Published online by Cambridge University Press:  28 February 2011

Armo Muurinen ,
Pirkkd Penitä-Hiltunen  and
Juba Rantanen
Armo Muurinen
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory Otakaari 3 A, SF-02150 Espoo, Finland
Pirkkd Penitä-Hiltunen
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory Otakaari 3 A, SF-02150 Espoo, Finland
Juba Rantanen
Affiliation:
Technical Research Centre of Finland, Reactor Laboratory Otakaari 3 A, SF-02150 Espoo, Finland
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Abstract

In this research the diffusion of strontium and cesium through bento- nite slabs in stationary state has been measured. The measurement gives directly the transport through the sample and the corresponding effective diffusivity. The apparent diffusivity, diffusivity of the sorbed ions as well as the sorption factors can also be evaluated on the basis of the same diffusion measurement. The sorption on the coxmpacted bentonite has also been measured in a special sorption test where a radioactive tracer has been allowed to diffuse into compacted bentonite until equilibrium was reached.

The measured effective diffusivities were clearly higher than they would be in the case of pure pore diffusion. The effective diffusivities also increase with K and the apparent diffusivities are almost independent on KD. This supports the theory that also the sorbed ions diffuse in their own phase. The sorption factors of the compacted bentonite correspond to the values of the batch experiments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 84: Symposium L – Scientific Basis for Nuclear Waste Management X , 1986 , 803
Copyright
Copyright © Materials Research Society 1987

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References

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