CdTe量子点荧光猝灭法测定微量铅  

Determination of Trace Lead by Fluorescence Quenching Method of CdTe Quantum Dots

作　　者：陈志兵[1] 李梦瑶[1] 陈静[2] 胡莉萍[1] 张洋[1] 

机构地区：[1]宿州学院化学与生命科学学院,安徽省宿州市汴河路71号234000 [2]吉林燃料乙醇有限公司

出　　处：《光谱实验室》2012年第2期686-689,共4页Chinese Journal of Spectroscopy Laboratory

基　　金：国家自然科学基金项目(20871089);安徽省教育厅重大项目(KJ2010ZD09);安徽省优秀青年人才基金项目(2009SQRZ173ZD);宿州学院科研平台开放课题(2010YKF05);大学生科研项目(KYLXLKZD06)

摘　　要：以CdTe量子点作为荧光探针,基于荧光猝灭法对铅进行了定量检测,考察了缓冲溶液体系、量子点浓度、反应时间等多种因素的影响。实验结果表明,在pH 7.5的0.2mol/L Na2HPO4-NaH2PO4缓冲液中,反应时间为10min,铅浓度为2.0×10-6—3.5×10-5mol/L范围时,其线性回归方程为ΔF=26.35+11.47C(×10-6mol/L),相关系数和检出限分别为0.9991和1.8×10-8mol/L。该方法灵敏度高,为铅的测定提供了新的方法。Using CdTe quantum dots（QDs） as fluorescent probe,Pb2＋ was quantitatively detected basing on PL quenching method of CdTe QDs.The influences of buffer solution system,concentration of QDs,and the reaction time were investigated.The results indicated that in 0.2mol/L Na2HPO4-NaH2PO4（pH 7.5） buffer solution with reaction time of 10 min,the emission intensity of CdTe QDs,and the concentration of Pb2＋ follow the linear equation in the range of 2.0×10-6—3.5×10-5mol/L and the obtained linear fitting equation was：ΔF=26.35＋11.47C（×10-6mol/L） with the correlation coefficient of 0.9991.The limitation of detection was 1.8×10-8mol/L.CdTe QDs can provide a new luminescent probe for detecting Pb2＋ with a extremely high sensitivity.

关 键 词：CDTE量子点 铅 荧光猝灭 

分 类 号：O657.32[理学—分析化学]