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    基于硫化镉量子点的荧光猝灭效应测定微量钴离子

    Determination of Trace Amount of Co2+ Based on the Fluorescence Quenching Effect of CdS Quantum Dots

    • 摘要: 以巯基丙酸作稳定剂制备了单分散的硫化镉量子点。在pH=7的反应介质中,钴离子对硫化镉量子点的荧光有很强的猝灭作用,且钴离子的浓度在1.0×10-5~2.5×10-4mol·L-1内与硫化镉量子点的荧光猝灭强度(ΔF/F)之间的关系符合Stern-Volmer方程,方法的检出限(3s)为1.3×10-6mol·L-1,据此提出了测定微量钴含量的方法。加标回收率在93.8%~105%之间,测定值的相对标准偏差(n=6)均小于4.0%。

       

      Abstract: Mono-dispersed CdS-quantum dots (CdS-QDs) were prepared using thiohydracrylic acid as stabilizer. It was found that the fluorescence of the CdS-QDs was quenched intensely by Co2+ in a reaction medium at pH 7, and that the magnitude of quenching of fluorescence intensity (ΔF/F) was controlled by the Stern-Volmer equation when the concentration of Co2+ was in the range of 1.0×10-5-2.5×10-4mol·L-1, value of detection limit (3s) found was 1.3×10-6mol·L-1. Based on these facts, a fluorometric method for determination of trace amounts of Co2+ was proposed. Values of recovery found by standard addition method were in the range of 93.8%-105%, and values of RSD′s (n=6) found were less than 4.0%.

       

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