Abstract
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 (UO2 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 UO2 2+, UO2SiO(OH) 3 + , and UO2OH+. The stability constant of UO2SiO(OH) 3 + was further optimized, based on the intensity profiles of the factors.
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