Journal
MICROCHIMICA ACTA
Volume 161, Issue 1-2, Pages 81-86Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-007-0801-4
Keywords
CdTe quantum dots; Pb2+; quenching of the fluorescence; food samples
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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 x 10(-6) and 1.0 x 10(-4) mol L-1 with a detection limit of 2.7 x 10(-7)mol L-1. The relative standard deviation (RSD) was 4.6% for a 4.0 x 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).
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