Sorption characteristics of 99Tc onto bentonite material with different additives under anaerobic conditions
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Hana Vinšová
Summary
The radionuclide 99Tc is one of the fission products of spent nuclear fuel. The chemical forms of this element depend primarily on the pH and Eh of the environment. The aim of this study was to describe the sorption of the pertechnetate anion onto bentonite under anaerobic conditions, which accurately simulate the environment of a deep repository. Several additives were tested to determine whether they increase the retention of 99Tc on this material — Fe, FeS, Fe3O4 and activated carbon.
It was found that it is very difficult to create the same conditions present in the deep repository in the laboratory, which is why the reduction of the pertechnetate anion to its lower oxidation state (Tc(IV)) was not achieved. The retention of the pertechnate anion on bentonite is very low (KD ∼1 mL/g), the uptake of the pertechnetate anion onto bentonite was achieved by the addition of suitable additives to the bentonite mixtures e.g. activated carbon, Fe and FeS (KD ∼102–103 mL/g). Various chemical forms of technetium were obtained in the solution, dependant on the various reaction mechanisms of the pertechnetate anion. Fe and FeS enabled the reduction of the pertechnetate anion to its lower oxidation state in the form of insoluble TcO(OH)2 or TcO2·nH2O, physical sorption is the dominant mechanism with activated carbon.
© Oldenbourg Wissenschaftsverlag
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- Measurement of fission neutron spectrum averaged cross sections of some threshold reactions on zirconium: Production possibility of no-carrier-added 90Y in a nuclear reactor
- Measurement of thermal neutron cross sections of the reactions 126Sn(n, γ)127g,127mSn
- Excitation functions of proton induced nuclear reactions on natural copper using a medium-sized cyclotron
- Precise and accurate determination of alpha decay half-life of 244Pu by relative activity method using thermal ionization mass spectrometry and alpha spectrometry
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