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IOf可使CdTeQDs荧光显著猝灭的特性,建立了一种检测103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8.66×10-6mol/L、反应时间为24min最佳实验条件下,检测IO-3的线性范围为6.0×10-8~7.2×10-6mol/L,检出限为4.92×10-8mol/L,方法相对标准偏差为2.37%。实验表明,IO-3对cdTeQDs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。
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 (IOa) was developed based on the significant fluorescence quenching of CdTe QDs. Factors affecting the IO;- detection 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 IOa in 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/ was 2. 37%. The selectivity and interference experiments showed that the present fluorescence probe exhibited relatively high selectivity for IO-3 over other anions. The proposed method was utilized for the analysis of IO-3 in tap water and the recoveries were 92.17%-103.29% for the spiking water. The possible quenching mechanism was also discussed.
出处
《分析科学学报》
CAS
CSCD
北大核心
2014年第1期16-20,共5页
Journal of Analytical Science
基金
国家自然科学基金(No.21175087)
山西省研究生优秀创新项目(No.20123012)