Sorption effects on cation diffusion in compacted bentonite
1999 (English)In: Engineering Geology, ISSN 0013-7952, E-ISSN 1872-6917, Vol. 54, no 1-2, 231-236 p.Article in journal (Refereed) Published
Diffusion of Na+. Cs+, Co2+ and Sr2+ in bentonite compacted to a dry density of 1800 kg m(-3) and saturated with groundwaters and aqueous solutions of differing ionic strength have been studied experimentally using the through diffusion technique. Sorption experiments have been carried out under a wide range of pH and concentration of supporting electrolyte. The dependence of the apparent diffusivity of Na+, Cs+ and Sr2+, mainly sorbed by ion exchange, on the sorption intensity is accommodated by a model encompassing diffusion of the sorbed cations within the electrical double layer next to the mineral surface in addition to diffusion in the pore water. The apparent diffusivity of Co2+, sorbed by surface complexation reactions, corresponds to complete immobilization on sorption.
Place, publisher, year, edition, pages
1999. Vol. 54, no 1-2, 231-236 p.
bentonite, caesium, cation, cobalt, diffusion, sodium, sorption, strontium
IdentifiersURN: urn:nbn:se:kth:diva-13484DOI: 10.1016/S0013-7952(99)00078-2ISI: 000082578000027OAI: oai:DiVA.org:kth-13484DiVA: diva2:325555
QC 201006182010-06-182010-06-182010-06-21Bibliographically approved