title: A stable and reproducible nanosilver-aggregation-4-mercaptopyridine surface-enhanced Raman scattering probe for rapid determination of trace Hg2+.
abstract: A stable nanosilver solution was prepared, using PEG10000 as stabilizer and NaBH(4) as reducer. In pH 6.6 Na(2)HPO(4)-NaH(2)PO(4) 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 Hg(2+) 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 Hg(2+) 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 Hg(2+) in the water sample, with satisfactory results.
authors.affiliation: Key Laboratory of Ecology of Rare and Endangered Species and Environmental Conservation of Education Ministry, Guangxi Normal University, Guilin 541004, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Li
authors.forename: Aihui
authors.initials: A
authors.lastname: Liang
authors.forename: Caina
authors.initials: C
authors.lastname: Jiang
authors.forename: Fang
authors.initials: F
authors.lastname: Li
authors.forename: Qingye
authors.initials: Q
authors.lastname: Liu
authors.forename: Zhiliang
authors.initials: Z
authors.lastname: Jiang