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Diffusion of cations in bentonite clay: laboratory and in-situ studies
KTH, Superseded Departments, Chemistry.
1999 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 1999. , vii, 33 p.
Series
Trita-KKE, ISSN 0349-6465 ; 9901
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-932ISRN: KTH/KKE--99/1--SEOAI: oai:DiVA.org:kth-932DiVA: diva2:14925
Note
QC 20100618Available from: 2000-09-26 Created: 2000-09-26 Last updated: 2010-06-18Bibliographically approved
List of papers
1. Diffusion of I, CS, and SR2- in compacted bentonite-anion exclusion and surface diffusion
Open this publication in new window or tab >>Diffusion of I, CS, and SR2- in compacted bentonite-anion exclusion and surface diffusion
1996 (English)Report (Other academic)
Series
SKB TR, 96-16
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-13481 (URN)
Note
QC 20100618Available from: 2010-06-18 Created: 2010-06-18 Last updated: 2010-07-15Bibliographically approved
2. CHEMLAB - in situ diffusion experiments using radioactive tracers
Open this publication in new window or tab >>CHEMLAB - in situ diffusion experiments using radioactive tracers
1998 (English)In: Radiochimica Acta, ISSN 0033-8230, Vol. 82, 153-156 p.Article in journal (Refereed) Published
Abstract [en]

In situ diffusion experiments in bentonite clay have been carried out in the probe CHEMLAB, using the radioactive tracers Co-57, Sr-85 and Cs-134. The measured diffusion profiles for the radionuclides are in good agreement with predicted profiles obtained from modelling based on apparent diffusivities and sorption coefficients obtained in laboratory experiments with corresponding clay density and ground water composition.

Keyword
in situ experiment, radionuclide, diffusion, cation
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-13483 (URN)000077683000025 ()
Note
QC 20100618Available from: 2010-06-18 Created: 2010-06-18 Last updated: 2010-06-21Bibliographically approved
3. Sorption effects on cation diffusion in compacted bentonite
Open this publication in new window or tab >>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
Abstract [en]

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.

Keyword
bentonite, caesium, cation, cobalt, diffusion, sodium, sorption, strontium
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-13484 (URN)10.1016/S0013-7952(99)00078-2 (DOI)000082578000027 ()
Note
QC 20100618Available from: 2010-06-18 Created: 2010-06-18 Last updated: 2010-06-21Bibliographically approved

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