Study of sorption and diffusion processes in natural bentonites
Distribution coefficients (Kd) have been determined for 134Cs and 85Sr by the batch method. Various factors affecting the Kd value as water-to-bentonite ratio and composition of the aqueous phase have been evaluated and will be discussed. Effective (De) and apparent (Da) diffusion coefficients for 85Sr in the compacted bentonite have been determined using the through-diffusion method. Dry bulk density and porosity of the dry bentonite and the water content in the saturated bentonite have been measured as well. Distribution coefficients calculated from the diffusion data using the dry bulk density and porosity values for given conditions have been compared and discussed with those determined by the batch method.
KeywordsBentonite Apparent Diffusion Coefficient Distribution Coefficient Breakthrough Curve Batch Method
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