Diffusion and sorption of U(VI) in compacted bentonite studied by a capillary method
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X. K. Wang
Summary
Diffusion and sorption of U(VI) in compacted bentonite were studied using a capillary method. The experiments were carried out at room temperature in 0.1 M NaClO4 solutions at pH 7.0±0.1. Effects of contact time, solution concentration and bentonite bulk density on diffusion were also investigated. The results fit the Fick's second law very well and are in good agreement with the literature data for similar bentonite dry densities [3]. The Kd values from capillary method are in most cases lower than those from batch experiments. The interlaminary space of the compacted bentonite contributes significantly to the sorption of uranium. The apparent diffusion coefficient Da of diffusion derived from the experiments are used to simulate its diffusion in compacted bentonite and the results indicate that several meters of compacted bentonite is enough to prevent the diffusion of from the repository to the environment.
© by Oldenbourg Wissenschaftsverlag, München
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Articles in the same Issue
- Radiochemical separation of actinides from environmental samples for determination with DF-ICP-MS and alpha spectrometry
- A comparative evaluation of 238Pu determination in NIST-SRM-947-Pu by alpha spectrometry and thermal ionization mass spectrometry
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- Crystal structure of new uranyl oxalates (NH4)2[UO2(C2O4)2· H2O]·2H2O and (NH4)2-x(N2H5)x[(UO2)2(C2O4)3]·3H2O (x=0 and x=1). Comparison with other uranyl oxalates
- Extraction of U(VI) with unsymmetrical N-methyl-N-decylalkylamide in toluene
- The effect of water treatment on the presence of particle-bound 210Po and 210Pb in groundwater
- On the transport and speciation of ruthenium in high temperature oxidising conditions
- Speciation of Tc(IV) in chloride solutions by capillary electrophoresis
