[1C09-12] Aqueous Separation and Analytical Technique 1

[1C09] Application of DTBA for An/Ln separation and its effect of synergism with other masking agent

*Yuji sasaki¹, Masashi Kaneko^1,2, Yasutoshi Ban¹ (1. Japan Atomic Energy Agency, 2. Osaka University)

Keywords:Actinide, Lanthanide, Mutual separation, Back extraction, TODGA, DTBA

DTBA (diethylenetriamine- N,N′,N″-triacetic acid-N,N″-bis(diethylacetamide) developed by JAEA, shows the comparatively high solubility in water, affinity with Ln and An, thus applicable in industrial use. DTBA have relatively high SF(= An/Ln, 8.3) in TODGA extraction system, by DTBA employment An can be separated from Ln through back-extraction from TODGA phase. Here, Ln contents in high-level radioactive waste are several ten times higher than An, it requests higher SF in order to achieve the satisfied separation. In this work, we investigate carefully to obtain higher SF under TODGA-DTBA system. In addition, based on Ln and An having high coordination numbers, we study the possibility of the synergistic back-extraction using DTBA and another masking agent, in order to obtain high SF(An/Ln).