title: Sorption of Cesium on smectite-rich clays from the Bohemian Massif (Czech Republic) and their mixtures with sand.
abstract: Sorption is an important process for the transport of radionuclides through backfill materials in a radioactive waste underground repository. Within this study, sorption of Cs on selected Czech clay materials and their mixtures with sand was investigated by batch tests. The experiments were performed under oxic conditions at 25 degrees C. Synthetic groundwater as a liquid phase and unconditioned clays (as they were provided by their producer) were used to reach the natural conditions as close as possible. Distribution ratios (Rds) of Cs for all selected clays rise with increase of the clay fraction in clay/sand mixtures in agreement with previous works studying sorption behaviour of such mixtures. The rise of Rds is from 10(2) cm3 g(-1) for mixtures with 80% of sand to 10(3) cm3 g(-1) for pure clays. There are significant differences between natural and technologically modified clays.
authors.affiliation: Department of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 12843 Prague, Czech Republic. vejsada@centrum.cz
authors.forename: J
authors.initials: J
authors.lastname: Vejsada
authors.forename: E
authors.initials: E
authors.lastname: Jelínek
authors.forename: Z
authors.initials: Z
authors.lastname: Randa
authors.forename: D
authors.initials: D
authors.lastname: Hradil
authors.forename: R
authors.initials: R
authors.lastname: Prikryl
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000032:analysis / Q000737:chemistry*; D002588:Cesium Radioisotopes / Q000032:analysis* / Q000737:chemistry*; D000077215:Clay; D045424:Complex Mixtures / Q000032:analysis / Q000737:chemistry; D018153:Czech Republic; D004058:Diffusion; D004784:Environmental Monitoring / Q000379:methods; D011874:Radiometry / Q000379:methods; D017640:Silicates / Q000737:chemistry*; D012822:Silicon Dioxide / Q000032:analysis / Q000737:chemistry*; D012990:Soil Pollutants, Radioactive / Q000032:analysis*
chemical_list: D000538:Aluminum Silicates; D002588:Cesium Radioisotopes; D045424:Complex Mixtures; D017640:Silicates; D012990:Soil Pollutants, Radioactive; D012822:Silicon Dioxide; C033214:Smectite; D000077215:Clay