[2B01-03] Novel Separation & Analysis 1

[2B01] Mutual separation of actinides from lanthanides using DTPA and DTBA as ligands and effect of adding amines

*Yuji Sasaki¹, Masashi Kaneko¹, Yasutoshi Ban¹ (1. Japan Atomic energy Agency)

Keywords:diglycolamide, solvent extraction, lanthanide, actinide, DTPA, DTBA, amine

A selective back-extraction method using DTPA and DTBA as complexants has been developed for mutual separation of actinides and lanthanides (Ln) extracted by TODGA. A novel complexant of DTBA (diethlenetriamine-N,N',N"-triaceticdiamide) had high solubility in water and strongly coordinated to Am under lower pH condition than that of DTPA. Multi-stage extraction experiments using DTPA and DTBA showed that the back-extraction ratios of Am and Ln were >97% and <3%, respectively. The effects of organic amines, such as ethlenediamine, on the complexation of Am and pH adjustment in the aqueous phase will also be presented.