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• W3194071330 abstract "Laboratory experiments studying the sorption and diffusivity of different tracers in Aespoe Hard Rock Laboratory (Aespoe HRL) site specific conditions have been performed. The experiments were conducted by applying both the batch sorption and the through diffusion technique. The investigation was focused on slightly sorbing tracers, i e, alkaline metals (Na{sup +}, Rb{sup +} and Cs{sup +}) and alkaline earth metals (Ca{sup 2+}, Sr{sup 2+} and Ba{sup 2+}), but some presumed non-sorbing species have also been included. The dominating generic rock material from Aespoe HRL, Aespoe-diorite and fine-grained granite, were used as well as some altered wall rock and mylonite from the Feature A fracture, the fracture where in situ migration studies have been performed. Synthetic groundwater was used; similar to the high saline groundwater found at the 350m level at Aespoe HRL and at the Feature A site. The results of batch experiments show that the sorption of the tracers increase in the order Na<Ca=Sr<Rb=Ba<Cs with the sorption coefficient of Na{sup +} in the order of (4-30)x10{sup -6} m{sup 3}/kg and for Cs{sup +} in the range of (I-400)x10{sup -3} m{sup 3}/kg. The variations in sorption coefficients are due to differences in the composition of the geological material, contact time and particle size. Sorption is generally stronger for the Aespoe-diorite than for the fine-grained granite which is explained by the much higher concentration of biotite in Aespoe diorite than in fine-grained granite. In the altered material the biotite has been transformed to chlorite and a lower sorptivity is shown for those material compared to the fresh diorite and granite, respectively. Attempts to explain the sorption and desorption results to a surface sorption - diffusion model are presented. The diffusion results show that the tracers were retarded in the same order as was expected from the measured batch sorption coefficients. Furthermore, the largest size fraction was the most representative when comparing batch sorption coefficients with sorption coefficients evaluated from the diffusion experiments. The observed effective diffusivities and transport porosities decreased with increasing sample lengths. It was also observed that the formation factor obtained for sorbing and non-sorbing tracers in the same sample is approximately equal. A heterogeneous and mineral specific porosity distribution was found in the Aespoe-diorite using the {sup 14}C-PMMA method, whereas the porosity pattern of fine-grained Granite was more uniformly distributed. The porous mineral areas were found to be consistent with the sorptive mineral areas in Aespoe-diorite. A double porosity network of slow and fast migration pathways, with different sorption capabilities, was used to describe the diffusion of Cs and Ba. The diffusivity and porosity were low in the Feature A sample containing mylonite compared to the generic material 31 refs, 37 figs, 33 tabs" @default.
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• W3194071330 date "1998-11-01" @default.
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• W3194071330 title "The interaction of sorbing and non-sorbing tracers with different Aespoe rock types. Sorption and diffusion experiments in the laboratory scale" @default.
• W3194071330 hasPublicationYear "1998" @default.
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