College of Chemistry, Jilin University, Changchun 130012, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2012 Sep;95:276-81. doi: 10.1016/j.saa.2012.04.086. Epub 2012 Apr 26.
The noble metal nanoparticles (NPs), including gold nanorods (AuNRs), gold nanospheres (AuNSs) and silver nanoplates (AgNPTs), were synthesized and Tween 20 stabilized NPs (Tween 20-NPs) were used as the probes for determining Hg(2+). Hg(2+) was determined based on the strong affinity between Au (Ag) and Hg. Hg(2+) was reduced to Hg in the presence of sodium borohydride. Hg interacts with the NPs and the diameter of the NPs decreases with the increase of Hg(2+) concentration, which causes the shift in absorption peak of Tween 20-NPs. The peak shifts are linearly related to Hg(2+) concentrations. Compared with AuNSs and AgNPTs, when the AuNRs was used, the sensitivity for determining Hg(2+) was higher. The developed method shows a good selectivity for Hg(2+) and can be applied to the determination of Hg(2+) in water samples.
贵金属纳米粒子（NPs），包括金纳米棒（AuNRs）、金纳米球（AuNSs）和银纳米盘（AgNPTs），被合成出来，并用吐温 20 稳定的 NPs（Tween 20-NPs）作为测定 Hg(2+)的探针。Hg(2+)的测定是基于 Au（Ag）与 Hg 之间的强亲和力。在硼氢化钠的存在下，Hg(2+)被还原为 Hg。Hg 与 NPs 相互作用，随着 Hg(2+)浓度的增加，NPs 的直径减小，导致 Tween 20-NPs 的吸收峰发生位移。峰位移与 Hg(2+)浓度呈线性关系。与 AuNSs 和 AgNPTs 相比，当使用 AuNRs 时，测定 Hg(2+)的灵敏度更高。所开发的方法对 Hg(2+)具有良好的选择性，并可应用于水样中 Hg(2+)的测定。
