Retardation of long-lived radionuclides on bentonites

被引：0
作者：
Jedináková-Krízová, V [1 ]
Jurcek, P [1 ]
Kohlícková, M [1 ]
机构：
[1] Inst Chem Technol, Dept Analyt Chem, CR-16628 Prague, Czech Republic
来源：
PROCEEDINGS OF THE WORKSHOP ON LONG-LIVED RADIONUCLIDE CHEMISTRY IN NUCLEAR WASTE TREATMENT | 1998年
关键词：
D O I：
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中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
This contribution summarises the mechanisms of transport and retardation processes, chemistry and migration behaviour of radionuclides of fission products and actinides in natural sorbents, especially bentonites. The effect of solubilities and dissolution reactions, diffusion and sorption/desorption, complexation and variations in the aqueous phase composition, pH-value and oxidation-reduction properties and other phenomena on Kd values is discussed. The experimental method of determining distribution coefficient K-d as one of the important parameters for characterisation of materials through static batch sorption experiments is proposed. Possible deviations due to irrelevant steps in this procedure are predicted and evaluated. Bentonites' buffering properties have been investigated by examining the effects of the aqueous phases pH on sorption of radionuclides Cs-134 and Sr-85. From the results it is evident that bentonites belong to materials with very good buffering properties. All types of bentonites show very good sorption properties.
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页码：99 / 110
页数：12
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