The extraction of uranium(VI), americium and europium by LIX 64 and by a mixture of LIX 64 and tri-n-octylphosphine oxide |
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Authors: | L Kuča Kim Chol Soo |
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Institution: | (1) Nuclear Research Institute, 250 68 e, Czechoslovakia;(2) Present address: Institute of Nuclear Physics, Pjongjang, Democratic Peoples Republic of Korea |
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Abstract: | The extraction of U(VI), Eu and Am by the aromatic main component (HA) of LIX 64N dissolved in toluene was studied at pH 3–9. The values of pH1/2 for the extraction with 0.146 M HA are 4.0, 5.5 and 5.2, and the pH's of maximum extraction are 6.0, 6.8, and 7.0 for U(VI), Eu and Am, respectively. The stoichiometry of the extracted chelates determined by the slope analysis is UO2A2 and MA3–nYn (n=1,2) for Eu and Am, the ligand Y being probably the nitrate anion. The addition of tri-n-octylphosphine oxide (TOPO) enhances the extraction of U(VI) and especially of Eu at pH<6. An Eu chelate species solvated by 2 TOPO molecules is extracted at pH 4 by the mixture of HA+TOPO, whereas the species extracted at pH 6.5 is not solvated by TOPO. |
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