Time-resolved laser-induced fluorescence spectroscopy combined with parallel factor analysis; A Robust speciation technique for UO $_{2}$ $^{2+}$

Saito, Takumi; Aoyagi, Noboru ; Kimura, Takaumi

Time-resolved laser-induced fluorescence spectroscopy (TRLFS) is a powerful speciation technique for fluorescent metal ions and can be further improved by combining with multi-mode factor analysis such as parallel factor analysis (PARAFAC). This study demonstrates the applicability of TRLFS combined with PARAFAC for the speciation of uranyl (UO $_{2}$ $^{2+}$ ) in the presence of silicic acid (Si(OH) $_{4}$ ). A series of TRLFS data with varied Si(OH) $_{4}$ concentration was processed by PARAFAC, resulting in three factors corresponding to free UO $_{2}$ $^{2+}$ , UO $_{2}$ SiO(OH) $_{3}$ $^{+}$ , and UO $_{2}$ OH $^{+}$ . The stability constant of UO $_{2}$ SiO(OH) $_{3}$ $^{+}$ was further optimized, based on the intensity profiles of the factors.

Language	:	English
Journal	:	Journal of Radioanalytical and Nuclear Chemistry
Volume	:	303
Number	:	2
Pages	:	p.1129 - 1132
Publication Year/Month	:	2015/02
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Paper URL	:	https://doi.org/10.1007/s10967-014-3465-7
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Keywords	:	no keyword
Research Facility	:	第4研究棟
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Registration No. : AA20140709
JAEA Abstracts No. : 43000373
Paper Submission No. : 15511

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