【摘要】 以3-巯基丙酸(MPA)为稳定剂,采用水相合成法制备了CdTe量子点(QDs)。基于IO-3可使CdTe QDs荧光显著猝灭的特性,建立了一种检测IO-3的荧光分析新方法。优化了实验条件,在pH=6.0、三酸缓冲溶液浓度为30mmol/L、QDs溶液浓度为8.66×10-6 mol/L、反应时间为24min最佳实验条件下,检测IO-3的线性范围为6.0×10-8~7.2×10-6 mol/L,检出限为4.92×10-8 mol/L,方法相对标准偏差为2.37%。实验表明,IO-3对CdTe QDs的荧光猝灭有较好的选择性。方法用于自来水中IO-3的回收率实验,回收率为92.17%~103.29%。对可能的机理进行了探讨。更多还原

【Abstract】 CdTe quantum dots(QDs)of high fluorescence was prepared in aqueous solution with 3-mercaptopropionic acid(MPA)as a stabilizer.And a new fluorometric method for the detection of iodate(IO-3)was developed based on the significant fluorescence quenching of CdTe QDs.Factors affecting the IO-3detection were investigated,and the optimum conditions were determined.When pH was 6.0,the buffer concentration was 30 mmol/L,the concentration of CdTe QDs was 8.66×10-6 mol/L and the reaction time was 24 min,the fluorescence sensor showed a maximum response.Under optimal conditions,its response was linearly proportional to the concentration of IO-3in the range of 6.0×10-8-7.2×10-6 mol/L with a detection limit of 4.92×10-8 mol/L.The relative standard deviation for 11 replicate measurements of 1.0 × 10-6 mol/L IO-3was 2.37%.The selectivity and interference experiments showed that the present fluorescence probe exhibited relatively high selectivity for IO-3over other anions.The proposed method was utilized for the analysis of IO-3in tap water and the recoveries were 92.17%-103.29%for the spiking water.The possible quenching mechanism was also discussed.更多还原