Highly sensitive detection of lead(II) ion using multicolor CdTe quantum dots
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Multicolor and water-soluble CdTe quantum dots (QDs) were synthesized with thioglycolic acid (TGA) as stabilizer. These QDs have a good size distribution, display high fluorescence quantum yield, and can be applied to the ultrasensitive detection of Pb(II) ion by virtue of their quenching effect. The size of the QDs exerts a strong effect on sensitivity, and quenching of luminescence is most effective for the smallest particles. The quenching mechanism is discussed. Fairly selective detection was accomplished by utilizing QDs with a diameter of 1.6 nm which resulted in a detection limit of 4.7 nmol L−1 concentration of Pb(II). The method was successfully applied to the determination of Pb(II) in spinach and citrus leaves, and the results are in good agreement with those obtained with atomic absorption spectrometry.
KeywordsCdTe quantum dots (QDs) Multicolor Fluorescence quenching Lead(II)
This work was financially supported by the National Natural Science Foundation of China (No. 20975050) and Jiangsu Province Program of Top-level Talents.
- 3.Pan YH, Liu XS, He XQ, Wang CH (2005) Lead speciation analysis by high performance liquid chromatography-inductively coupled plasma mass spectrometry. Chin J Anal Chem 33(11):1560–1564Google Scholar
- 6.Pharmacopoeia C (2005 edition)Google Scholar
- 12.Li Z, Dong CQ, Tang LC, Zhu X, Chen HJ, Ren JC (2010) Aqueous synthesis of CdTe/CdS/ZnS quantum dots and their optical and chemical properties. Luminesc. doi: 10.1002/bio.1250
- 13.Yan ZY, Pang DW, Shao XF, Hu YZ (2005) Determination of trace amount of copper in the chinese herbal medicine by fluorescence quenching of quantum dots. J Chin Pharm Univ 36(3):230–233Google Scholar
- 14.Gattás-Asfura KM, Leblanc RM (2003) Peptide-coated cds quantum dots for the optical detection of copper(II) and silver(I). Chem Comm 2684–2685Google Scholar
- 15.Zhang YY, Dong J, Wang N, Gao P, Zang SL (2009) The synthesis of luminescent CdTe quantum dots and its interaction with Au(III). Anal Sci 25(2):135–138Google Scholar
- 22.GB/T 5009.12-1996Google Scholar
- 29.Isarov A, Chrysochoos J (1997) Optical and photochemical properties of nonstoichiometric cadmium sulfide nanoparticles: surface modification with copper(II) ions, vol 13. American Chemical Society, Washington, DC, ETATS-UNISGoogle Scholar