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Experimental Study of Cation Diffusivities in Homoionized Montmorillonite by Electrical Conductance Method

Published online by Cambridge University Press:  15 February 2011

Masahide Okamoto,
Toshio Takase and
Kunio Higashi
Masahide Okamoto
Affiliation:
Department of Nuclear Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606, Japan
Toshio Takase
Affiliation:
Mitsubishi Materials Corp., 1- 3- 25 Koishigawa, Bunkyo- ku, Tokyo 112, Japan
Kunio Higashi
Affiliation:
Department of Nuclear Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606, Japan
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Abstract

Montmorillonite purified from bentonite was homoionized by leaching with a chloride solution of sodium, potassium, cobalt or strontium, and then leaching with ethanol until the leachate contained only a negligible amount of the cation.

The electrical conductances of thus obtained Na-, K-, Co- and Sr- homoionized montmorillonite were measured. Applying the Nernst- Einstein equation to the electrical conductance, the diffusion coefficient for cations attached to the solid phase (montmorillonite) Ds, and that for cations in the bulk water phase Dw, were evaluated independently. As predicted, Ds was almost independent of the solid/liquid ratio, while Dw increased rapidly with the decrease of the ratio towards the diffusion coefficient in free water.

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References

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