Determination of sorption properties of intact rock samples: New methods based on electromigration
2009 (English)In: Journal of Contaminant Hydrology, ISSN 0169-7722, E-ISSN 1873-6009, Vol. 103, no 3-4, 71-81 p.Article in journal (Refereed) Published
Two new methods for determining sorption coefficients in large rock samples have been developed. The methods use electromigration as a means to speed up the transport process, allowing for fast equilibration between rock sample and tracer solution. An electrical potential gradient acts as a driving force for transport in addition to the concentration gradient and forces the cations through the rock sample towards the cathode. The electrical potential gradient induces both electromigration and electroosmotic flow with a resulting solute transport that is large compared to diffusive fluxes. In one of the methods, the solute is driven through the sample and collected at the cutlet side. In the other, simpler method, the rock sample is equilibrated by circulating the solute through the sample. The equilibration of rock samples, up to 5 cm in length, with an aqueous solution has been accomplished within days to months. Experiments using cesium as a sorbing tracer yield results consistent with considerably more time demanding in-diffusion experiments. These methods give lower distribution coefficients than those obtained using traditional batch experiments with crushed rock. (C) 2008 Elsevier B.V. All rights reserved.
Place, publisher, year, edition, pages
2009. Vol. 103, no 3-4, 71-81 p.
K-d, Ion exchange, Retardation, Sorption, Electromigration, Cesium, Granite, Intact rock, MIGRATION BEHAVIOR, UNIFIED MODEL, POROUS-MEDIA, BOOM-CLAY, CONDUCTIVITY, DIFFUSIVITY, STRONTIUM, MEMBRANE, MINERALS
IdentifiersURN: urn:nbn:se:kth:diva-13628DOI: 10.1016/j.jconhyd.2008.09.006ISI: 000263009100001ScopusID: 2-s2.0-58149165041OAI: oai:DiVA.org:kth-13628DiVA: diva2:326244
QC 201006222010-06-222010-06-222010-07-19Bibliographically approved