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 Co^(2+) Based on the Fluorescence Quenching Effect of CdS Quantum Dots

作　　者：王妍[1] 贾红霞[1] 曹雨虹[1] 马刚[1] 杜保安[1] 

机构地区：[1]河北大学化学与环境科学学院药物化学与分子诊断教育部重点实验室,保定071002

出　　处：《理化检验（化学分册）》2016年第10期1123-1126,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家自然科学青年基金项目(21405032);国家自然科学基金项目(21075027);教育部科学技术研究重点项目(211014)

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1.0×10-5~2.5×10-4 mol·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1.3×10-6 mol·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%。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 Co^2＋ 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 Co^2＋ 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%.

关 键 词：硫化镉 量子点 荧光猝灭 钴离子 

分 类 号：O657.32[理学—分析化学]