Reaction stoichiometry for coextraction of technetium(VII) with uranium(VI) by CMPO |
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| Authors: | M. Takeuchi S. Tanaka M. Yamawaki S. Tachimori |
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| Affiliation: | (1) Nuclear Engineering Research Laboratory, The University of Tokyo, Tokai-mura, 319-11 Ibaraki-ken, Japan;(2) Department of Fuel Cycle Safety Research, Japan Atomic Energy Research Institute, Tokai-mura, 319-11 Ibaraki-ken, Japan |
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| Abstract: | The coextraction equilibrium of technetium(VII) and uranium(VI) from nictric acid solution was studied in a system involvingn-octyl(phenyl)-N,N-diisobutylcarbamoylmethyl phosphine oxide (CMPO) in decalin. Stoichiometry of technetium, uranium and CMPO in the Tc-U-CMPO complex was obtained from the distribution data by slope analysis. The results indicated that the enhanced extraction of technetium was caused by the formation of UO2NO3TcO4·nCMPO (wheren=2 and/or 3). It was found that this coextraction of technetium with uranium was well explained by using ion exchange reaction between UO2(NO3)2·2CMPO complex and TcO4–. |
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