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Trace analysis of uranyl ion (UO2(2+)) in aqueous solution by fluorescence turn-on detection via aggregation induced
Xiaotong Chen1, Linfeng He1, Yang Wang1
1Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, PR China.
Abstract:
A sensitive fluorescence turn-on method for trace amounts of uranyl ion (UO2(2+)) in solution has been developed in this study, based on aggregation induced emission enhancement (AIEE) characteristics of 4-pethoxycarboxyl salicylaldehyde azine (PCSA) induced by complex interaction between UO2(2+) and PCSA. Under optimized conditions, a fluorescence enhancement at 540 nm could be observed, which was linearly related to the concentration of UO2(2+) in the range of 1-25 ppb (part per billion). Analytical data showed that a detection limit of 0.2 ppb was achieved with the relative standard deviation (R.S.D.) 1.3% (n=5). The proposed method was successfully utilized in quantifying UO2(2+) in fuel processing wastewaters.
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