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Issue 9, 2011
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Highly sensitive and selective fluorescent assay for quantitative detection of divalent copper ion in environmental water samples

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Abstract

It was found that Cu2+ has a great catalytic effect on p-cresol oxidation by hydrogen peroxide under alkaline conditions, leading to an intense fluorescence signal due to the fast formation of 2,2′-dihydroxy-5,5′-dimethylbiphenyl, an oxidation product of p-cresol. Investigation of the fluorescence spectra of the p-cresol–hydrogen peroxide system demonstrated the catalytic behavior of Cu2+. On this basis, a very simple, sensitive, and selective fluorescent method was established for the determination of trace copper in this study. Under the optimal conditions, the proposed system could respond down to 1.0 × 10−8 mol L−1 of Cu2+ with a linear calibration range of 3.0 × 10−7 mol L−1 to 5.0 × 10−5 mol L−1. The relative standard deviation (RSD) was 2.1% for 7.0 × 10−6 mol L−1Cu2+ (n = 15). The proposed method was successfully applied in the determination of trace Cu2+ in lake, river and swimming pool water samples with satisfactory results. The results obtained by the proposed method are in good agreement with those obtained by a conventional atomic absorption spectroscopy method.

Graphical abstract: Highly sensitive and selective fluorescent assay for quantitative detection of divalent copper ion in environmental water samples

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Supplementary files

Publication details

The article was received on 19 May 2011, accepted on 06 Jul 2011 and first published on 10 Aug 2011


Article type: Paper
DOI: 10.1039/C1AY05298E
Anal. Methods, 2011,3, 2102-2107

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    Highly sensitive and selective fluorescent assay for quantitative detection of divalent copper ion in environmental water samples

    H. Cao, W. Shi, J. Xie and Y. Huang, Anal. Methods, 2011, 3, 2102
    DOI: 10.1039/C1AY05298E

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