Materials Sciences Research Center, Japan Atomic Energy Agency (JAEA), 1-1-1 Koto, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan.
Department of Applied Chemistry, University of Miyazaki, 1-1 Gakuen Kibanadai Nishi, Miyazaki, 889-2192, Japan.
Anal Sci. 2022 Jul;38(7):1003-1006. doi: 10.1007/s44211-022-00123-5. Epub 2022 May 22.
Liquid-liquid extraction of lanthanide (Ln) ions was investigated using N,N-dioctylthiodiglycolamic acid (DOTDGAA), which is a sulfur donor ligand with an amide group and a carboxyl group connected by a thioether chain. The extraction performance and selectivity of DOTDGAA for Ln ions were compared with those of N,N-dioctyldiglycolamic acid (DODGAA), which is also an oxygen donor ligand with a similar chemical structure, to assess the effect of the soft/hard donor atom on Ln separation. DOTDGAA quantitatively extracted all Ln ions while being selective toward the light and middle Ln ions, in contrast to the selectivity of DODGAA for heavier Ln ions. Slope analysis demonstrated that the Ln transfer using DOTDGAA proceeded through a proton-exchange reaction, forming a 1:3 complex, Ln(DOTDGAA). The back-extraction of Ln ions from the extracting phase was successfully achieved under acidic conditions.
采用 N,N-二辛基硫代二甘氨酸（DOTDGAA）作为硫供体配体，通过硫醚链连接酰胺基和羧基，研究了镧系元素（Ln）离子的液-液萃取。比较了 DOTDGAA 和 N,N-二辛基二甘氨酸（DODGAA）对 Ln 离子的萃取性能和选择性，以评估软/硬给体原子对 Ln 分离的影响。DOTDGAA 定量萃取所有 Ln 离子，对轻和中镧系元素具有选择性，而 DODGAA 则对较重的 Ln 离子具有选择性。斜率分析表明，使用 DOTDGAA 进行 Ln 转移是通过质子交换反应进行的，形成 1:3 络合物 Ln（DOTDGAA）。Ln 离子可以在酸性条件下从萃取相中反萃取。
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