College of Chemistry, Sichuan University, Chengdu, 29 Wangjiang Road, Chengdu, Sichuan 610064, China.
Talanta. 2011 Apr 15;84(2):382-6. doi: 10.1016/j.talanta.2011.01.012. Epub 2011 Jan 15.
The interaction between mercaptoacetic acid (MA)-capped CdTe QDs, MA-capped CdTe/ZnS QDs or glutathione (GSH)-capped CdTe QDs with As(III) was studied using fluorescence spectrometry. As (III) has a high-affinity to reduced-GSH to form As(SG)(3), and the emission of the GSH-capped CdTe QDs (λ(em.) =612 nm) is quenched effectively. Thus, a novel fluorescence spectrometric method was developed for As (III) determination by using GSH-CdTe QDs. Under optimal conditions, the quenched fluorescence intensity (F(0)/F) increased linearly with the concentration of As (III) ranging from 5.0 × 10(-6) to 25 × 10(-5) mol L(-1). The limit of detection (3σ) for As (III) was found to be 2 × 10(-8) mol L(-1). This method is potentially useful in visual detection of As (III) under irradiation of the ultraviolet light.
巯基乙酸（MA）修饰的 CdTe QDs、MA 修饰的 CdTe/ZnS QDs 或谷胱甘肽（GSH）修饰的 CdTe QDs 与 As(III)之间的相互作用，使用荧光光谱法进行了研究。As(III)与还原型 GSH 具有高亲和力，形成 As(SG)(3)，而 GSH 修饰的 CdTe QDs 的发射（λ(em.) =612nm）被有效猝灭。因此，通过使用 GSH-CdTe QDs 开发了一种用于测定 As(III)的新型荧光分光光度法。在最佳条件下，猝灭荧光强度（F(0)/F）与 As(III)的浓度在 5.0×10(-6)到 25×10(-5)mol L(-1)之间呈线性增加。发现 As(III)的检出限（3σ）为 2×10(-8)mol L(-1)。该方法在紫外光照射下对 As(III)的可视化检测具有潜在的应用价值。
