Journal
ANALYST
Volume 137, Issue 8, Pages 1899-1903Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2an16202d
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Funding
- NSFC [21075081]
- National Basic Research Program of China [2009CB930400]
- Nano-Science Foundation of Shanghai [1052nm04000]
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A new method for quenching kinetic discrimination of Fe2+ and Fe3+, and sensitive detection of trace amount of Fe2+ was developed by using synchronous fluorescence scan technique. The principle of this assay is based on the quenching kinetic discrimination of Fe2+ and Fe3+ in CePO4:Tb3+ nanocrytals-H2O2 hybrid system and the Fenton reaction between Fe2+ and H2O2. Stable, water-soluble and well-dispersible CePO4:Tb3+ nanocrystals were synthesized in aqueous solutions, and characterized by transmission electron microscopy (TEM) and electron diffraction spectroscopy (EDS). We found that both Fe2+ and Fe3+ could quench the synchronous fluorescence of CePO4:Tb3+ nanocrytals-H2O2 system, but their quenching kinetics velocities were quite different. In the presence of Fe3+, the synchronous fluorescent intensity was unchanged after only one minute, but in the presence of Fe2+, the synchronous fluorescent intensity decreased slowly until 28 min later. The Fenton reaction between Fe2+ and H2O2 resulted in hydroxyl radicals which effectively quenched the synchronous fluorescence of the CePO4:Tb3+ nanocrystals due to the oxidation of Ce3+ into Ce4+ by hydroxyl radicals. Under optimum conditions, the linear range for Fe2+ is 3 nM-2 mu M, and the limit of detection is 2.0 nM. The method was used to analyze water samples.
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