Key Laboratory of Analysis and Detection Technology for Food Safety, Ministry of Education, Department of Chemistry, Fuzhou University, Fuzhou 350002, China.
Talanta. 2010 Apr 15;81(1-2):433-7. doi: 10.1016/j.talanta.2009.12.020. Epub 2009 Dec 22.
Novel ratiometric fluorescent silica nanoparticles with high selectivity towards Hg(2+) were synthesized for the detection of Hg(2+). Hg(2+) promoted the ring opening of spirolactam in the rhodamine moiety grafted onto the silica nanoparticles, resulting in a change in the fluorescence intensity. The fluorescence intensity was proportional to the Hg(2+) concentration, and the detection limit (S/N=3) for Hg(2+) was found to be 2.59 x 10(-9) mol L(-1) with a linear range from 0.4 to 8 x 10(-7) mol L(-1). In addition, the morphology of the silica nanoparticles, the effects of pH and co-existing substances, and the reversibility were investigated. The proposed approach was successfully applied to the determination of Hg(2+) in water samples.
新型比率型荧光硅纳米粒子对 Hg(2+)具有高选择性，可用于 Hg(2+)的检测。Hg(2+)促进了接枝在硅纳米粒子上的罗丹明部分中环开反应，导致荧光强度发生变化。荧光强度与 Hg(2+)浓度成正比，Hg(2+)的检测限（S/N=3）为 2.59 x 10(-9) mol L(-1)，线性范围为 0.4 至 8 x 10(-7) mol L(-1)。此外，还研究了硅纳米粒子的形态、pH 值和共存物质的影响以及可逆性。该方法成功应用于水样中 Hg(2+)的测定。
