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Migration Behaviour of Strontium in Czech Bentonite Clay

Journal of Sustainable Development of Energy, Water and Environment Systems
Volume 4, Issue 3, pp 293-306
DOI: http://dx.doi.org/10.13044/j.sdewes.2016.04.0023
Lucie Baborova1 , Dušan Vopálka1, Aleš Vetešník1, Eva Hofmanová1,2
1 Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic
2 ÚJV Řež, a.s., Fuel Cycle Chemistry Department, Hlavní 130, 250 68 Husinec ‒ Řež, Czech Republic

The study deals with sorption and diffusion behaviour of strontium in Czech bentonite B75. The study is a part of a research on reactive transport of radioactive contaminants in barrier materials of a deep geological repository of radioactive waste in the Czech Republic. Series of sorption and diffusion experiments with Sr and non-activated Ca bentonite B75 produced in the Czech Republic were performed in two background solutions (CaCl2 and NaCl). On the basis of sorption batch experiments the kinetics of strontium sorption on bentonite was assessed and the sorption isotherms for various experimental conditions were obtained. As a result of performed diffusion experiments the parameters of diffusion (i.e. effective diffusion coefficient De and apparent diffusion coefficient Da) were determined. The observed discrepancies between sorption characteristics obtained from the sorption and diffusion experiments are discussed.

Keywords: Bentonite, Strontium, Radionuclide migration, Reactive transport, Diffusion experiments, Batch method.

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