The influence of temperature and hydration on the sorption properties of bentonite

The effects of exposure to synthetic groundwater at elevated temperature gradients on the sorption properties of bentonite were investigated using the Mock-Up-Cz experiment. This experiment simulated the vertical placement of a container of radioactive waste according to the Swedish KBS-3 system for...

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Bibliographic Details
Published in:Journal of environmental radioactivity 2008-02, Vol.99 (2), p.415-425
Main Authors: Vinšová, Hana, Jedináková-Křížová, Věra, Kolaříková, Irena, Adamcová, Jana, Přikryl, Richard, Zeman, Josef
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Bentonite - chemistry
Bentonite stability
CEC
Cesium
Deep repository
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Ion Exchange Resins
Mineralogical transformations
Mock-Up experiment
Pollution
Pollution, environment geology
Radioactive wastes
Sorption
Technetium
Temperature
Wastes
Water - chemistry
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Summary:The effects of exposure to synthetic groundwater at elevated temperature gradients on the sorption properties of bentonite were investigated using the Mock-Up-Cz experiment. This experiment simulated the vertical placement of a container of radioactive waste according to the Swedish KBS-3 system for a period of more than 3 years. The mineralogical composition, as well as its chemical and physico-chemical properties, including the uptake of 99TcO 4 − and 134Cs +, was used to evaluate the chemical changes caused by the long-term exposure of bentonite buffer to thermal and hydration gradients. It was found that the bentonite material was predominantly stable. No more than 2% of the montmorillonite was transformed due to thermal and moisture gradients. It was concluded that the new-formed mineral phases have no significant influence on the ion exchange and sorption properties of bulk bentonite samples.
ISSN:0265-931X
1879-1700
DOI:10.1016/j.jenvrad.2007.11.003