2024-03-29T10:43:03Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/182412010-03-22T23:00:00Zcom_10261_91com_10261_8col_10261_344
Tritium redistribution between water and clay minerals
López-Galindo, A.
Fenoll Hach-Alí, P.
Pushkarev, A. V.
Lytovchenko, A. S.
Baker, J. H.
Pushkarova, R. A.
Tritium
Adsorption
Kaolinite
Montmorillonite
Palygorskite
Structural OH-groups
9 pages, 3 figures, 5 tables.
Hydrogen-isotope exchange between clay minerals and tritiated water was studied with kaolinite, montmorillonite and palygorskite. At all possible positions, tritium accumulated most intensively during the initial stage (10 to 20 days) but further increase of tritium concentration in experimental systems was much less intensive. Interaction of tritiated water with clay minerals decreased in a similar manner. In all samples, the highest amounts of tritium atoms and the maximum accumulation rates (V) were observed in the surface-adsorbed water (Vsurf) over the complete study period. The modes of tritium accumulation in the interlayer space (montmorillonite) and in the channels (palygorskite) (Vinter) are quite similar and both types of structures are very suitable for hydrogen-isotope exchange. Availability of well-developed paths for the access of T+ ions to structural OH-groups (Vstruct) enables intense tritium accumulation at these positions in montmorillonite and palygorskite (Vinter Vstruct). In kaolinite the access of T+ ions to structural OH-groups is more difficult, in spite of the considerable number of potential exchange positions in its structure, therefore resulting in lower tritium adsorption in comparison with the other two clay minerals.
2009-11-03T09:14:30Z
2009-11-03T09:14:30Z
2008-05
artículo
Applied Clay Science 39(3-4): 151-159 (2008)
0169-1317
http://hdl.handle.net/10261/18241
10.1016/j.clay.2007.06.005
eng
http://dx.doi.org/10.1016/j.clay.2007.06.005
closedAccess
Elsevier