基于ZnO／CdS量子点荧光探针测定环境样品中的痕量铅  

Determination of Trace Lead in Environmental Samples by ZnO/CdS Quantum Dots as Fluorescence Probes

作　　者：景彩霞[1] 孙雪花[2] 于浩[2] 马久兰 刘芳玲[2] 胡海婧[2] 

机构地区：[1]延安大学医学院,陕西省延安市光华路38号716000 [2]延安大学化学与化工学院,陕西省延安市宝塔区圣地路580号716000

出　　处：《光谱实验室》2014年第3期348-351,共4页Chinese Journal of Spectroscopy Laboratory

基　　金：陕西省重点实验室项目（12JS119）;延安大学国家级大学生创新训练计划项目（201210719008）

摘　　要：在水溶液中合成了十二烷基苯磺酸钠（SDBS）修饰的ZnO／CdS量子点（QDs），基于重金属铅与ZnO／CdS量子点的荧光猝灭作用，建立了以ZnO／CdS量子点为荧光探针检测痕量铅的新方法。实验发现，pH=5．00的HAc-NaAc缓冲溶液中，量子点的浓度为6．90×10^-6mol／L时，铅的浓度在2．0×10^-9-2．2×10^-7mol／L范围与ZnOICdS量子点荧光猝灭强度呈良好的线性关系，相关系数为0．9980，检出限为9．6×10^-10mol／L。应用此法检测环境水体中的痕量重金属铅的含量，结果满意。The water-soluble ZnO/CdS quantum dots （QDs） was synthesized using sodium dodecyl benzene sulfonate as stabilizer. A novel method for determination of trace lead has been developed based on quenching of the fluorescence of ZnO/CdS QDs by in lead aqueous solutions. The optimum reaction conditions was found to be at pH 5.00 with HAc-NaAc buffer solution, and a ZnO/CdS QDs concentration of 6.90×10^-6moFL. The quenched fluorescence intensity of ZnO/CdS QDs is linearly proportional to the concentration of lead ions from 2.0×10^-9 to 2.2×10^-7 mol/L with a correlation coefficient of 0.9980, and the detection limit for silver ions is 9.6×10^-10mol/L. Then the proposed new method was applied to detect trace of heavy metals lead ion content of the environmental water with satisfactory results.

关 键 词：ZNO CDS量子点 荧光猝灭 铅 

分 类 号：O657.32[理学—分析化学]