Glutathione-protected silver nanoclusters for sensing trace-level Hg2+ in a wide pH range. Issue 4 (19th January 2015)

• Record Type: Journal Article
• Authors: Zhong, Yaping; Deng, Chun; He, Yu; Ge, Yili; Song, Gongwu
• Is Part Of: Analytical methods. Volume 7:Issue 4(2015)
• Page Start: 1558
• Page End: 1562
• Publication Date: 2015-01-19
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/c4ay02561j
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : A fluorescence method for the determination of Hg 2+ in a wide pH range and based on the Ag nanoclusters was established. Abstract : An effective fluorescence method for the selective and rapid determination of trace-level Hg 2+ in a wide pH range had been proposed based on the glutathione-protected Ag nanoclusters (NCs). Factors affecting the fluorescence intensity of GSH–Ag NCs were investigated. We found that the fluorescence intensity of Ag NCs remained high and stable under pH from 4 to 10, which benefits the monitoring of Hg 2+ under different pH conditions in real samples. The fluorescence quenching mechanism is also discussed. The fluorescence of Ag NCs could be quenched in the presence of Hg 2+ with a detection limit as low as 1 nM. Good linear correlations were obtained over the concentration range from 0 to 2.5 μM under different pH values (pH = 7, pH = 4 and pH = 9). In addition, this method was successfully applied to the determination of Hg 2+ in real samples.