Tritium redistribution between water and clay minerals
Date
2008
Authors
Lopez Galindo, A.
Hach Ali, P.
Pushkarev, A.
Lytovchenko, A.
Baker, J.
Pushkarova, R.
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Journal article
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Applied Clay Science, 2008; 39(3):151-159
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Abstract
Hydrogen-isotope exchange between clay minerals and tritiated water was studied with kaolinite, montmorillonite andpalygorskite. At all possible positions, tritium accumulated most intensively during the initial stage (10 to 20 days) but further increaseof tritium concentration in experimental systems was much less intensive. Interaction of tritiated water with clay minerals decreased ina similar manner. In all samples, the highest amounts of tritium atoms and the maximum accumulation rates (V) were observed in thesurface-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 forhydrogen-isotope exchange. Availability of well-developed paths for the access of T+ ions to structural OH-groups (Vstruct) enablesintense tritium accumulation at these positions in montmorillonite and palygorskite (Vinter≅Vstruct). In kaolinite the access of T+ ions tostructural OH-groups is more difficult, in spite of the considerable number of potential exchange positions in its structure, thereforeresulting in lower tritium adsorption in comparison with the other two clay minerals.
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Copyright 2007 Elsevier