基于上转换发光纳米粒子（NaYF4:Yb3+, Er3+）内滤效应的六价铬灵敏测定。
Sensitive determination of chromium (VI) based on the inner filter effect of upconversion luminescent nanoparticles (NaYF4:Yb3+, Er3+).
机构信息
College of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, PR China.
出版信息
Talanta. 2012 Sep 15;99:404-8. doi: 10.1016/j.talanta.2012.05.071. Epub 2012 Jun 17.
A new method was developed for selective and sensitive determination of trace chromium (VI) based on the inner filter effect (IFE) of upconversion luminescent nanoparticles (NaYF(4):Yb(3+), Er(3+)) as fluorescence probes. In this study, water-soluble and well dispersible upconversion luminescent nanoparticles (NaYF(4):Yb(3+), Er(3+)) were firstly synthesized by hydrothermal method, and characterized by transmission electron microscopy (TEM) and luminescence spectroscopy. And then, the IFE method was established for determination of chromium (VI). The principle of this assay is based on the complementary overlap of the green emission band of nanoparticles (NaYF(4):Yb(3+), Er(3+)) with the absorption spectrum of a pink chelate complex (Cr(III)-diphenylcarbazone), which was generated by the quantitative reaction between diphenylcarbazide (DPC) and Cr(VI) in mineral acid solution. Under the optimal condition, the decrease in the upconversion luminescent nanoparticles was proportional to the concentration of chromium (VI) due to IFE. The linear range is 0.070-10.0×10(-6) mol L(-1) Cr(VI), and the limit of detection (3σ) is 2.40×10(-8) mol L(-1) Cr(VI). The method described here is sensitive than the method of spectrophotometry. This assay was used in the determination of Cr(VI) in water samples.
一种新的方法是基于上转换发光纳米粒子（NaYF(4):Yb(3+), Er(3+)）的内滤效应（IFE）为荧光探针，用于选择性和灵敏地测定痕量铬（VI）。在本研究中，首先通过水热法合成了水溶性和良好分散性的上转换发光纳米粒子（NaYF(4):Yb(3+), Er(3+)），并通过透射电子显微镜（TEM）和发光光谱进行了表征。然后，建立了用于测定铬（VI）的IFE 方法。该测定法的原理基于纳米粒子（NaYF(4):Yb(3+), Er(3+)）的绿色发射带与酸性溶液中 DPC 和 Cr(VI)定量反应生成的粉红色螯合物络合物（Cr(III)-二苯卡巴肼）的吸收光谱的互补重叠。在最佳条件下，由于IFE，上转换发光纳米粒子的减少与铬（VI）的浓度成正比。线性范围为 0.070-10.0×10(-6) mol L(-1) Cr(VI)，检测限（3σ）为 2.40×10(-8) mol L(-1) Cr(VI)。这里描述的方法比分光光度法更灵敏。该测定法用于水样中 Cr(VI)的测定。
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