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.
出处
《光谱实验室》
CAS
CSCD
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)
关键词
CDTE量子点
铅
荧光猝灭
CdTe Quantum Dots
Lead
Fluorescence Quenching
