论文部分内容阅读
以谷胱甘肽(GSH)为稳定剂,在水溶液中制备稳定的CdTe纳米量子点。根据Pb(Ⅱ)对CdTe量子点的荧光具有较强的猝灭效应,建立一种简便灵敏的测定铅的新方法。考察了缓冲液体系、缓冲液pH、量子点的浓度和反应时间等对Pb2+测定的影响。结果表明,在Tris缓冲液(pH8.8)中,CdTe量子点浓度0.0306mmol/L,反应时间5min,体系的相对荧光强度与Pb2+浓度呈良好的线性关系,其线性范围为10—105μg/L,检出限0.27μg/L(3σ),加标回收率在97.6%—101.8%之间。此方法操作简便,快速,可用于化妆品中铅(Ⅱ)含量的测定。
With glutathione (GSH) as a stabilizer, a stable CdTe nanometer quantum dot was prepared in aqueous solution. According to the strong quenching effect of Pb (Ⅱ) on the fluorescence of CdTe quantum dots, a simple and sensitive new method for the determination of lead was established. The effects of buffer system, buffer pH, quantum dot concentration and reaction time on Pb2 + determination were investigated. The results showed that the concentration of CdTe quantum dots was 0.0306mmol / L and the reaction time was 5min in Tris buffer solution (pH8.8). The relative fluorescence intensity and the concentration of Pb2 + showed a good linearity with a linear range of 10-105μg / L , The detection limit was 0.27μg / L (3σ), the recoveries were between 97.6% -101.8%. This method is simple, fast and can be used for the determination of lead (II) in cosmetics.