离子液体-分散液相微萃取法萃取分离水体痕量铝离子

Analysis and Separation of Al^(3+) Using Ionic Liquid Dispersive Liquid Phase Micro-extraction in Water Samples

[目的]研究离子液体-分散液相微萃取法萃取分离水体痕量Al^(3+)的最优条件。[方法]以水体中铝离子为研究对象,以[C_4MIM]Br为萃取剂,以丙酮为分散剂,以桑色素为铝离子络合剂,建立了离子液体-分散液相微萃取法萃取分离水体铝离子的方法,并对分散液相微萃取法的试验条件进行了优化,包括溶液pH、萃取剂与分散剂的种类与用量、萃取时间等。[结果]在最佳试验条件下,铝离子浓度在0.1~10.0μg/m L呈良好的线性关系,相关系数r=0.998 6,相对标准偏差(RSD)为2.8%。[结论]该方法富集效率高、绿色环保,属于环境友好型方法,适用于水体中微量铝离子的分离分析。

[ Objective] To study optimal conditions for separation of Al3＋ using ionic liquid dispersive liquid phase micro-extraction in water samples. [Method] A method of ionic liquid dispersive liquid phase micro-extraction was developed for the extraction of Al3＋ with ethidium bromide-1 -butyl -3 -methyl imidazole used as extraction agent, acetone as the disperse agent, morin as aluminum complexing agent. The ex- perimental parameters were optimized, including the pH value, extraction agent and dispersing agent types and dosage, extraction time. [ Result ] Under the optimal experimental conditions, the aluminum concentration in the range of 0. 1 - 10.0 μg/mL showed a good linear relation- ship, correlation coefficient r = 0. 998 6 with the relative standard deviation of 2.8%. [ Conclusion] The method has the advantages of high enrichment efficiency and environmental protection, and is suitable for the separation and analysis of trace aluminum in water samples.