College of Science, The State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, People's Republic of China.
Luminescence. 2009 Sep-Oct;24(5):271-5. doi: 10.1002/bio.1088.
The behaviors of 15 kinds of metal ions in the thiol-capped CdTe quantum dots (QDs)-H2O2 chemiluminescence (CL) reaction were investigated in detail. The results showed that Ag+, Cu2+ and Hg2+ could inhibit CdTe QDs and H2O2 CL reaction. A novel CL method for the selective determination of Ag+, Cu2+ and Hg2+ was developed, based on their inhibition of the reaction of CdTe QDs and H2O2. Under the optimal conditions, good linear relationships were realized between the CL intensity and the logarithm of concentrations of Ag+, Cu2+ and Hg2+. The linear ranges were from 2.0 x 10(-6) to 5.0 x 10(-8) mol L(-1) for Ag+, from 5.0 x 10-6 to 7.0 x 10(-8) mol L(-1) for Cu2+ and from 2.0 x 10(-5) to 1.0 x 10(-7) mol L(-1) for Hg2+, respectively. The limits of detection (S/N = 3) were 3.0 x 10(-8), 4.0 x 10(-8) and 6.7 x 10(-8) mol L(-1) for Ag+, Cu2+ and Hg2+, respectively. A possible mechanism for the inhibition of CdTe QDs and H2O2 CL reaction was also discussed.
详细研究了 15 种金属离子在巯基封端的 CdTe 量子点（QD）-H2O2 化学发光（CL）反应中的行为。结果表明，Ag+、Cu2+和 Hg2+可以抑制 CdTe QD 和 H2O2 CL 反应。基于它们对 CdTe QD 和 H2O2 反应的抑制作用，建立了一种用于选择性测定 Ag+、Cu2+和 Hg2+的新型 CL 方法。在最佳条件下，CL 强度与 Ag+、Cu2+和 Hg2+浓度的对数之间呈现出良好的线性关系。Ag+的线性范围为 2.0×10（-6）至 5.0×10（-8）mol·L（-1），Cu2+的线性范围为 5.0×10（-6）至 7.0×10（-8）mol·L（-1），Hg2+的线性范围为 2.0×10（-5）至 1.0×10（-7）mol·L（-1）。Ag+、Cu2+和 Hg2+的检出限（S/N=3）分别为 3.0×10（-8）、4.0×10（-8）和 6.7×10（-8）mol·L（-1）。还讨论了抑制 CdTe QD 和 H2O2 CL 反应的可能机制。
