@article{oai:ynu.repo.nii.ac.jp:00012164,
 author = {Daiki, Nomizu and Yuji, Sasaki and Masashi, Kaneko and Masahiko, Matsumiya and Shoichi, Katsuta},
 issue = {3},
 journal = {Journal of Radioanalytical and Nuclear Chemistry},
 month = {Feb},
 note = {We studied the stepwise formation constants (β) of water-soluble diglycolamide (DGA) and dioxaoctanediamide (DOODA) for the mutual separation of Ln in a solvent extraction system. TODGA (N,N,Nʹ,Nʹ-tetraoctyl-diglycolamide) and DOODA(C8) (N,N,Nʹ,Nʹ-tetraoctyl-dioxaoctanediamide) exhibit opposite behaviors in extracting both light and heavy Ln through Ln-patterns. Metal complexes of two- and three-folding with water-soluble DOODA and DGA, respectively, were found, and each β value was calculated using distribution ratios. Taking β, their distribution ratio, D, and separation factor, SF, values into consideration, the suitable separation conditions (aqueous phase: 30 mM DOODA(C2) in 1 M HNO3; organic phase: 0.1 M TODGA in n-dodecane) of multistage extraction (10 × 10 extraction using aqueous and organic phases, including one sample solution) were determined. In this study, La, Pr, and Nd were mainly present in the aqueous phase, whereas Sm–Dy existed in the organic phase. Although these two groups can be easily separated into two phases, the resolution, Rs, values provide for little mutual separation between La–Nd and Sm–Dy under the present conditions.},
 pages = {1483--1493},
 title = {Complex formation of light and heavy lanthanides with DGA and DOODA, and its application to mutual separation in DGA–DOODA extraction system},
 volume = {331},
 year = {2022}
}