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Complex formation of light and heavy lanthanides with DGA and DOODA, and its application to mutual separation in DGA–DOODA extraction system

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Abstract

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.

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Acknowledgements

We gratefully acknowledge Dr. M. Watanabe of the Research Group for Radiochemistry at JAEA for managing the laboratory and ensuring safety. We also thank Mr. R. Ono of Tokyo Institute of Technology, Y. Tsuchida at Yokohama National University, and T. Matsutani at Chiba University for useful information on this work.

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Authors and Affiliations

  1. Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan

    Daiki Nomizu, Yuji Sasaki & Masashi Kaneko

  2. Graduate School of Environment and Information Sciences, Yokohama National University, 79-2 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan

    Daiki Nomizu & Masahiko Matsumiya

  3. Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage, Chiba, 263-8522, Japan

    Shoichi Katsuta

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  1. Daiki Nomizu
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  2. Yuji Sasaki
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Correspondence to Masahiko Matsumiya.

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Nomizu, D., Sasaki, Y., Kaneko, M. et al. Complex formation of light and heavy lanthanides with DGA and DOODA, and its application to mutual separation in DGA–DOODA extraction system. J Radioanal Nucl Chem 331, 1483–1493 (2022). https://doi.org/10.1007/s10967-022-08204-5

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