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Diffusion and Migration of Ions in Sedimentary Rock Matrix: Behaviour of Cesium and Iodide in Micropores of Sandstone

Published online by Cambridge University Press:  11 February 2011

Haruo Sato  and
Tamotsu Muraoka
Haruo Sato
Affiliation:
Japan Nuclear Cycle Development Institute 4–33 Muramatsu, Tokai-mura, Naka-gun, Ibaraki-ken, 319–1194, JAPAN
Tamotsu Muraoka
Affiliation:
Japan Nuclear Cycle Development Institute 4–33 Muramatsu, Tokai-mura, Naka-gun, Ibaraki-ken, 319–1194, JAPAN
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Abstract

In-diffusion experiments for Cs+ and I- in sandstone were performed as a function of ionic strength of porewater ([NaCl] =0.01, 0.51M) and tracer concentration ([Cs1] =7.5E-5, 1.5E-2M) together with the measurements of the fundamental properties of sandstone, and apparent diffusivities (Da) and rock capacity factors (α) for Cs+ were obtained. The obtained Da-values for Cs+ were scarcely dependent on [NaCl], but increased with increasing [Cs+]. This trend is consistent with that of α-values, indicating that although effective diffusivity and distribution coefficient scarcely depend on [NaCl], those depend on [Cs+]. The concentration profiles of I- were all in breakthrough. Although this indicates that I- diffusion is faster than that of Cs+, the concentration profiles of I- may have been lower than those for blank samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II3.36
Copyright
Copyright © Materials Research Society 2003

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References

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