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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.

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Category:Chemistry, Analytical

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