Microchimica Acta

, Volume 161, Issue 1–2, pp 81–86

A novel method for the determination of Pb2+ based on the quenching of the fluorescence of CdTe quantum dots

Original Paper

DOI: 10.1007/s00604-007-0801-4

Cite this article as:
Wu, H., Liang, J. & Han, H. Microchim Acta (2008) 161: 81. doi:10.1007/s00604-007-0801-4

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).

Keywords: CdTe quantum dots; Pb2+; quenching of the fluorescence; food samples 

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.College of Science, Institute of Chemical Biology, State Key Laboratory of Agricultural MicrobiologyHuazhong Agricultural UniversityWuhanChina

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