A novel method for the determination of Pb2+ based on the quenching of the fluorescence of CdTe quantum dots |
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Authors: | Hongmin Wu Jiangong Liang Heyou Han |
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Institution: | (1) College of Science, Institute of Chemical Biology, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China |
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Abstract: | A novel method for the determination of Pb2+ has been developed based on quenching of the fluorescence of thiol-capped CdTe quantum dots (QDs) by Pb2+ in aqueous solutions. Under optimum conditions, the relative fluorescence intensity was linearly proportional to the concentration
of Pb2+ between 2.0 × 10−6 and 1.0 × 10−4 mol L−1 with a detection limit of 2.7 × 10−7 mol L−1. The relative standard deviation (RSD) was 4.6% for a 4.0 × 10−5 mol L−1 Pb2+ solution (N = 5). As an application, the proposed method was successfully applied to the analysis of Pb2+ in food samples, and the results were satisfactory, i.e. consistent with those of flame atomic absorption spectrometry (FAAS).
Correspondence: Heyou Han, College of Science, Institute of Chemical Biology, State Key Laboratory of Agricultural Microbiology,
Huazhong Agricultural University, Wuhan 430070, P.R. China |
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Keywords: | : CdTe quantum dots Pb2+ quenching of the fluorescence food samples |
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