Analytical Sciences

Abstract − Analytical Sciences, 36(2), 241 (2020).

Effects of Diluents on the Separation of Minor Actinides from Lanthanides with Tetradodecyl-1,10-phenanthroline-2,9-diamide from Nitric Acid Medium
Nao TSUTSUI,*,** Yasutoshi BAN,** Hideya SUZUKI,** Masahiko NAKASE,* Sayumi ITO,* Yusuke INABA,* Tatsuro MATSUMURA,** and Kenji TAKESHITA*
*Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1-N1-16 Ookayama, Meguro, Tokyo 152-8550, Japan
**Research Group for Partitioning, Japan Atomic Energy Agency, 2-4 Sirakata, Tokai, Ibaraki 319-1195, Japan
To investigate the effective separation of actinides (Ans) from lanthanides (Lns), single-stage batch extraction experiments were performed with a novel extractant, tetradodecyl-1,10-phenanthroline-2,9-diamide (TDdPTDA) with various diluents such as 3-nitrobenzotrifluoride (F-3), nitrobenzene, and n-dodecane for Am, Cm, and Lns. The extraction kinetics with TDdPTDA was rapid enough to perform continuous extraction experiments using mixer-settler extractors. The slopes of the distribution ratio versus the TDdPTDA concentration and the distribution ratio versus the nitric acid concentration were similar for F-3 and nitrobenzene systems, but different from the n-dodecane system. These differences were attributed to the characteristics of the diluents. This study revealed high distribution ratios of Am (DAm) and Cm (DCm) for TDdPTDA, with the high separation factors (SFs) of Am from Lns enough for their separation.