Standard Gibbs free energies for transfer of actinyl ions at the aqueous/organic solution interface

Kitatsuji, Yoshihiro ; Okugaki, Tomohiko*; Kasuno, Megumi*; Kubota, Hiroki*; Maeda, Koji*; Kimura, Takaumi ; Yoshida, Zenko; Kihara, Sorin*

Standard Gibbs energies for transfer (G $_{tr}$ $^{0}$ ) of actinyl ions (AnO $_{2}$ $^{z+}$ ; z = 2 or 1; An: U, Np or Pu) between an aqueous solution and an organic solution were determined based on distribution method combined with voltammetry for ion transfer at the interface of two immiscible electrolyte solutions. The organic solutions examined were nitrobenzene, 1,2-dichloroethane, benzonitrile, acetophenone and 2-nitrophenyl octyl ether. Irrespective of the type of organic solutions, G $_{tr}$ $^{0}$ of UO $_{2}$ $^{2+}$ , NpO $_{2}$ $^{2+}$ and PuO $_{2}$ $^{2+}$ were nearly equal to each other and slightly larger than that of Mg $^{2+}$ . The G $_{tr}$ $^{0}$ of NpO $_{2}$ $^{+}$ was extraordinary large compared with those of ordinary monovalent cations. The dependence of G $_{tr}$ $^{0}$ of AnO $_{2}$ $^{z+}$ on the type of organic solutions was similar to that of H $^{+}$ or Mg $^{2+}$ . The G $_{tr}$ $^{0}$ of An $^{3+}$ and An $^{4+}$ were also discussed briefly.

Language	:	English
Journal	:	Journal of Chemical Thermodynamics
Volume	:	43
Number	:	6
Pages	:	p.844 - 851
Publication Year/Month	:	2011/06
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Paper URL	:	https://doi.org/10.1016/j.jct.2010.12.023
DOI for research data	:
Keywords	:	no keyword
Research Facility	:	プルトニウム研究1棟
Press Release	:
Article of JAEA R&D Review	:	How Hydrophilic are Actinide Ions?; Determination of Standard Gibbs Energy of Transfer at Aqueous/Organic Interface[/]
Cooperating Institute	:	龍谷大学; 京都工芸繊維大学

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Registration No. : AA20100801
JAEA Abstracts No. : 39000609
Paper Submission No. : 8824

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