期刊
TALANTA
卷 99, 期 -, 页码 890-896出版社
ELSEVIER
DOI: 10.1016/j.talanta.2012.07.052
关键词
Hg2+; 4-mercaptopyridine; Aggregated-nanosilver suspension; SERS; Quantitative analysis
资金
- National Natural Science Foundation of China [21075023]
- Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education
- Research Funds of Guangxi Water Conservancy
A stable nanosilver solution was prepared, using PEG10000 as stabilizer and NaBH4 as reducer. In pH 6.6 Na2HPO4-NaH2PO4 buffer solution containing PEG10000 and NaCl, the nanosilvers (AgNPs) were aggregated to form the stable nanosilver-aggregation (AgNPA) that could conjugate with 4-mercaptopyridine (MPy) to obtain an AgNPA-MPy surface-enhanced Raman scattering (SERS) probe with a strong SERS peak at 1097 cm(-1). When Hg2+ concentration increased, the SERS intensity at 1097 cm(-1) decreased linearly as the stable complex of [Hg(MPy)(2)](2+) was formed and the AgNPA particles precipitate to the bottom. The decreased SERS intensity was linear to Hg2+ concentration in the range of 50-3000 nmol/L. Based on this, a new sensitive SERS method has been proposed for the determination of trace Hg2+ in the water sample, with satisfactory results. (C) 2012 Elsevier B.V. All rights reserved.
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