期刊
ANALYTICA CHIMICA ACTA
卷 770, 期 -, 页码 140-146出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2013.01.042
关键词
Glutathione; Gold nanoclusters; Chromium; Environmental sample; Fluorescence quenching
资金
- National Basic Research Program of China [2009CB421605, 2011CB936001]
- National Natural Science Foundation of China [21107120, 20977096]
A novel method for selective determination of Cr(III) and Cr(VI) in environmental water samples was developed based on target-induced fluorescence quenching of glutathione-stabilized gold nanoclusters (GSH-Au NCs). Fluorescent GSH-Au NCs were synthesized by a one-step approach employing GSH as reducing/protecting reagent. It was found that Cr(III) and Cr(VI) showed pH-dependent fluorescence quenching capabilities for GSH-Au NCs, and thus selective determination of Cr(III) and Cr(VI) could be achieved at different pHs. Addition of EDTA was able to effectively eliminate the interferences from other metal ions, leading to a good selectivity for this method. Under optimized conditions, Cr(III) showed a linear range of 25-3800 mu g L-1 and a limit of detection CLOD) of 2.5 mu g L-1. The Cr(VI) ion demonstrated a linear range of 5-500 mu g L-1 and LOD of 0.5 mu g L-1. The run-to-run relative standard deviations (n = 5) for Cr(III) and Cr(VI) were 3.9% and 2.8%, respectively. The recoveries of Cr(III) and Cr(VI) in environmental water samples were also satisfactory (76.3-116%). This method, with its simplicity, low cost, high selectivity and sensitivity, could be used as a promising tool for chromium analysis in environmental water samples. (C) 2013 Elsevier B.V. All rights reserved.
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