In situ analysis for spontaneous reduction of Eu3+ in LiCl pyroprocessing media at 923 K

被引:21
作者
Kim, Tack-Jin [1 ]
Jeong, Yong-Kwang [2 ]
Kang, Jun-Gill [2 ]
Jung, Yongju [3 ]
Ahn, Do-Hee [1 ]
Lee, Han-Soo [1 ]
机构
[1] Korea Atom Energy Res Inst, Taejon 305353, South Korea
[2] Chungnam Natl Univ, Dept Chem, Taejon 305764, South Korea
[3] Korea Univ Technol & Educ, Dept Appl Chem Engn, Cheonan 330780, South Korea
关键词
Europium chloride; LiCl; Pyroprocessing; Molten salt; Potentiostatic method; Spectroscopy; THERMODYNAMIC PROPERTIES; KCL; SEPARATION; PLUTONIUM; EU(III); URANIUM; EUCL3;
D O I
10.1007/s10967-010-0651-0
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The spontaneous reduction of Eu3+ to Eu2+ was examined when EuCl3 was added into a pyroprocessing media of LiCl molten salt at 923 K. The amount of Eu2+ was calculated by measuring the total charge consumed to oxidize Eu2+ ions to Eu3+ ions. The concentration ratio of Eu2+ to Eu3+ was estimated to be about 0.40 in the media. In addition, it is confirmed that the reduction of Eu3+ to Eu2+ is caused by the oxidation power of Cl- to Cl-2. The coexistence of Eu3+ and Eu2+ in the LiCl molten salt system was examined by UV-Visible and luminescence spectroscopy. The molar absorptivities of Eu3+ and Eu2+, calculated from UV-Visible absorption spectra, were 423 and 1954 M-1 cm(-1), respectively.
引用
收藏
页码:283 / 286
页数:4
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