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Effects of Compaction and Temperature on Sorption and Diffusion of Cs and HTO in Compacted Bentonite Saturated with Saline Water

Published online by Cambridge University Press:  19 October 2011

Satoru Suzuki ,
Masashi Haginuma  and
Kazunori Suzuki
Satoru Suzuki
Affiliation:
kakusuzuki@iri.or.jp, Institute of Research and Innovation, Nuclear Chemistry and Chemical Engineering Center, 1201 Takada, Kashiwa, 277-0861, Japan
Masashi Haginuma
Affiliation:
haginuma@iri.or.jp, Institute of Research and Innovation, Nuclear Chemistry and Chemical Engineering Center, 1201 Takada, Kashiwa, 277-0861, Japan
Kazunori Suzuki
Affiliation:
k-suzuki@iri.or.jp, Institute of Research and Innovation, Nuclear Chemistry and Chemical Engineering Center, 1201 Takada, Kashiwa, 277-0861, Japan
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Abstract

The sorption and diffusion of Cs and HTO in compacted bentonite was investigated at temperatures from 30 to 60°C. The apparent (Da) and effective (De) diffusion coefficients were determined by in-diffusion and through-diffusion experiments with a constant boundary concentration maintained. The temperature dependence of De and Da obeyed an Arrhenius-type equation, allowing determination of the activation energy for diffusion of Cs and HTO. The De value of Cs was three times the De of HTO, which is considered to be a result of surface-excess diffusion. Cs may be concentrated near the surface of the negatively charged clay, thus giving a large diffusive flux. The activation energies for Cs diffusion were 21.4×2.8 kJ/mol and 37.3×1.5 kJ/mol as determined based on De and Da, respectively. This difference was due to the temperature dependence of the distribution coefficient Kd of Cs.

Keywords

diffusionadsorptionCs
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 985: Symposium NN – Scientific Basis for Nuclear Waste Management XXX , 2006 , 0985-NN11-12
Copyright
Copyright © Materials Research Society 2007

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