U and Pu separation with U/TEVA resin: Influence of some parameters on chromatographic cycle performances
Résumé
Due to unexpected Pu behavior using the U/TEVA resin and the most-recognized reagents, some key separation stages need to be studied for the U–Pu separation: Pu valency adjustment, Pu elution solution composition, resin loading rate and Pu elution solution stability over time. The new Pu elution solution developped in the study, composed of 3× 10$^{–3}$ mol L$^{–1}$ ascorbic acid / 3× 10$^{–3}$ mol L$^{–1}$ sulfamic acid / 2 mol L$^{–1}$ HNO$_3$, helps obtaining a more robust method: recovery yields over 80% and decontamination factor up to 2×10$^4$ . The best separation performances were obtained when the new Pu elution solution was freshly prepared, the resin loading rate did not exceed 30% and with a waiting time for the valency adjustment between the addition of H$_2$O$_2$ and the start of the chromatographic cycle set at 42 h regardless the Pu quantity involved
Domaines
Chimie analytiqueOrigine | Publication financée par une institution |
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