title: The influence of temperature and hydration on the sorption properties of bentonite.
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.
authors.affiliation: Institute of Chemical Technology, Prague, Department of Analytical Chemistry, Technická 5, 166 28 Prague 6, Czech Republic. vinsovah@vscht.cz
authors.forename: Hana
authors.initials: H
authors.lastname: Vinsová
authors.forename: Vera
authors.initials: V
authors.lastname: Jedináková-Krízová
authors.forename: Irena
authors.initials: I
authors.lastname: Kolaríková
authors.forename: Jana
authors.initials: J
authors.lastname: Adamcová
authors.forename: Richard
authors.initials: R
authors.lastname: Prikryl
authors.forename: Josef
authors.initials: J
authors.lastname: Zeman
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D007475:Ion Exchange Resins; D013696:Temperature; D014867:Water / Q000737:chemistry*
chemical_list: D007475:Ion Exchange Resins; D014867:Water; D001546:Bentonite