The influence of temperature and hydration on the sorption properties of bentonite |
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Authors: | Vinsová Hana Jedináková-Krízová Vera Kolaríková Irena Adamcová Jana Prikryl Richard Zeman Josef |
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Institution: | Institute of Chemical Technology, Prague, Department of Analytical Chemistry, Technická 5, 166 28 Prague 6, Czech Republic. |
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Abstract: | 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 (99)TcO(4)(-) and (134)Cs(+), 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. |
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