Journal
TALANTA
Volume 104, Issue -, Pages 135-139Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2012.11.020
Keywords
Gold nanoclusters; Nitrite; Optical sensors; Detection; Water analysis
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21020102038, 50972058]
- 973 Program [2011CB933502]
- Postdoctoral Science Foundation of China [2012M511236]
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Near-infrared fluorescent gold nanoclusters (AuNCs) were prepared by sonochemical method and applied for the selective and sensitive detection of nitrite. The fluorescence of AuNCs could be selectively quenched by nitrite, and the mechanism was discussed in detail. The fluorescence intensity decreased linearly upon the increasing concentration of nitrite in a wide range of 2.0 x 10(-8) M to 5.0 x 10(-5) M. The detection limit was only 1.0 nM (S/N=3), which was much lower than the maximum admissible concentration of 2.2 mu M required by the European Community. The proposed method was also applied for the determination of nitrite in real water samples. The present method exhibited excellent analytical performances, such as wide detection range, good selectivity, high sensitivity, and the applicability in neutral medium. (C) 2012 Elsevier B.V. All rights reserved.
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