Abstract
A rhodamine-benzimidazole conjugate (RB) as a probe was investigated. UV-Vis analysis showed that a strong absorption band at 552 nm was formed with the addition of Cu2+, while other transition metal ions induced a little more absorption. The absorption value of RB solution at 552 nm has a linear correlation with Cu2+ concentration between 35–70 μmol/L; the detection limit reached 6.82×10−2 μmol/L, which is lower than the settled limitation for copper in the drinking water (∼30 μmol/L) standardized by World Health Organization (WHO). Moreover, FL analysis showed that only Fe3+ could induce large fluorescence intensity enhancement at 582 nm; other common metal ions including Cu2+ cannot induce the enhancement. There was a good linear correlation between relative fluorescence intensity and Fe3+ concentration ranging from 2 μmol/L to 20 μmol/L, and the detection limit reached 1.70×10−2 μmol/L. The results showed that RB could detect Cu2+ and Fe3+ simultaneously, with the UV-Vis and fluorescence spectroscopy, respectively.
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Foundation item: Supported by National Natural Science Foundation of China (20901063, 51203127), Wuhan Chenguang Scheme (Grant 201050231049) established under Wuhan Science and Technology Bureau, Outstanding youth project of Hubei Provincial Department of Education (20121509).
Biography: YU Xianglin, female, Ph.D., Associate professor, research direction: organic/inorganic compound functional materials.
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Yu, X., Qu, H., Hu, Q. et al. A rhodamine-based sensor for chromogenic detection of Cu2+ and fluorescent detection of Fe3+ . Wuhan Univ. J. Nat. Sci. 19, 129–136 (2014). https://doi.org/10.1007/s11859-014-0989-1
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DOI: https://doi.org/10.1007/s11859-014-0989-1