基于CdTe量子点荧光探针测定水样中痕量Cd^(2+)  

Determination of Trace Cadmium in Water Samples Based on CdTe Quantum Dot Fluorescent Probes

作　　者：陶慧林[1] 黎舒怀[1] 徐铭泽[1] 周素莲[1] 何宗辉[1] 

机构地区：[1]桂林理工大学化学与生物工程学院,广西桂林541004

出　　处：《分析科学学报》2013年第5期639-642,共4页Journal of Analytical Science

基　　金：国家自然科学基金(No.21167006);广西自然科学基金(No.2011GXNS-FA018061)

摘　　要：本文以巯基乙酸为稳定剂,在水相中合成水溶性的CdTe量子点(CdTe QDs),并基于QDs荧光增强原理,建立了QDs荧光探针测定水中痕量Cd2+的新方法。研究表明,在pH为7.8的硼酸-硼砂缓冲溶液和吐温-40的存在下,Cd2+能够显著增强CdTe QDs的荧光强度,且Cd2+浓度在2.0×10-7～5.5×10-5g/L范围内与CdTe QDs荧光增强强度呈现良好的线性关系,相关系数为0.9988,检出限(3s/k)为3.2×10-8 g/L。该方法简单便捷,灵敏度高,应用于实际水样的检测,回收率为96.0%～102.5%。In this paper,CdTe quantum dots were systhesized in aqueous solution with thioglycolic acid （TGA） as the stabilizing agent. A novel method has been developed for Cd2＋ determination based on the fluorescence enhancement of CdTe QDs by Cdz＋. The results showed that, the fluorescence intensity of CdTe QDs could significantly be enhanced by Cd2＋. There was a good linear relationship between the fluorescence intensity of CdTe QDs and Cd2＋ concentration. Under optimum conditions, the linear range was 2.0× 10-7-5. 5 ×10-5 g/L with a detection limit of 3.2 × 10-s g/L（3s/k）. This method has good stability, wide linear range and low detection limit as well as good anti-interference ability. It was applied to the analysis of water samples with the recoveries of 96.0%-102.5%.

关 键 词：CDTE 荧光探针 荧光增强 Cd2+ 

分 类 号：O657.39[理学—分析化学]