Key Laboratory of Ecology of Rare and Endangered Species and Environmental Conservation of Education Ministry, Guangxi Normal University, Guilin 541004, China.
Talanta. 2012 Sep 15;99:890-6. doi: 10.1016/j.talanta.2012.07.052. Epub 2012 Jul 24.
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) 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.
采用 PEG10000 作为稳定剂、NaBH4 作为还原剂，制备了稳定的纳米银溶液。在含有 PEG10000 和 NaCl 的 pH 6.6 的 Na2HPO4-NaH2PO4 缓冲溶液中，纳米银（AgNPs）聚集形成稳定的纳米银聚集物（AgNPA），可与 4-巯基吡啶（MPy）结合，得到具有强 SERS 峰（在 1097cm-1）的 AgNPA-MPy 表面增强拉曼散射（SERS）探针。当 Hg（2+）浓度增加时，由于形成了稳定的[Hg（MPy）（2）]（2+）配合物，AgNPA 颗粒沉淀到底部，在 1097cm-1 处的 SERS 强度线性降低。降低的 SERS 强度与 50-3000nmol/L 范围内的 Hg（2+）浓度呈线性关系。基于此，提出了一种新的用于测定水样中痕量 Hg（2+）的灵敏 SERS 方法，结果令人满意。
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