The behaviors of metal ions in the CdTe quantum dots-H2O2 chemiluminescence reaction and its sensing application.
The behaviors of metal ions in the CdTe quantum dots-H2O2 chemiluminescence reaction and its sensing application.
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DOI：
10.1002/bio.1088
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发表时间：
2009-09
期刊：
影响因子：
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通讯作者：
Zonghai Sheng;Heyou Han;Jiangong Liang
中科院分区：
文献类型：
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作者：
Zonghai Sheng;Heyou Han;Jiangong Liang
研究了15种金属离子在硫醇包盖CdTe量子点(QDs)-H2O2化学发光反应中的行为。结果表明，Ag+、Cu2+和Hg2+能抑制CdTe量子点和H2O2 CL反应。基于对CdTe量子点与H2O2反应的抑制作用，建立了一种选择性测定Ag+、Cu2+和Hg2+的CL法。在最优条件下，CL强度与Ag+、Cu2+和Hg2+浓度的对数呈良好的线性关系。Ag+的线性范围为2.0 × 10(-6) ~ 5.0 × 10(-8) mol L(-1)， Cu2+的线性范围为5.0 × 10-6 ~ 7.0 × 10(-8) mol L(-1)， Hg2+的线性范围为2.0 × 10(-5) ~ 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）。讨论了CdTe量子点抑制H2O2 CL反应的可能机理。
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.