8-羟基喹啉动态有序介孔SiO_2涂层毛细管微萃取与ICP-MS在线联用分析天然水中铝的形态  

8-Hydroxyquinoline Dynamically Modified Ordered Mesoporous Silica Coating Capillary Microextraction Online Coupled to ICP-MS for the Fractionation of Aluminum in Natural Waters

作　　者：胡文凌[1] 胡斌[1] 郑菲 

机构地区：[1]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《分析科学学报》2009年第6期621-624,共4页Journal of Analytical Science

基　　金：国家自然科学基金(No.20575048);教育部新世纪优秀人才支持计划项目(No.NCET-04-0658)

摘　　要：本文采用溶胶-凝胶方法合成SiO2溶胶，制备了8-羟基喹啉改性的有序介孔SiO2涂层毛细管，建立了毛细管微萃取-电感耦合等离子体质谱（CME—ICP—MS）在线联用技术分析铝形态的新方法。选择游离态铝和Al-柠檬酸络合物为不同铝形态的代表物，详细探讨了不同实验参数对铝形态分离的影响。结果表明：8-羟基喹啉改性的有序介孔SiO2涂层毛细管在pH为5．0～8．0的范围内可以有效地分离试样中的稳定态单核铝（柠檬酸铝）和非稳定态无机单核铝（游离态铝）。方法的富集倍数为10，检出限为0．34ng·mL^-1。该法应用于湖水、池塘水和长江水中铝的组形态分析，所得结果与8-羟基喹啉负载硅胶微柱分离所得结果吻合很好。An ordered mesoporous silica coated capillary prepared by sol-gel technique was dynamically modified with 8-hydroxyquinoline （8-Ox） for the fractionation of aluminum by capillary microextraction （CME）. It was found that non-labile nomomeric Al （Al-citrate） and labile nomomeric （free Al） could be efficiently separated by 8-Ox modified ordered mesoporous silica coated capillary at the pH range of 5.0- 8.0. Based on this fact, a new technique of CME on-line coupled with ICP-MS has been proposed for the analysis of different A1 species in environmental waters. Under the optimal conditions, the detection limit for Al was 0. 34 ng · mL^-1 and the preconcentration factor was 10 fold. The method has been applied to the fractionation of Al in lake water, pool water and Yangtze River water, and the results were in good agreement with that obtained by the 8-Ox loaded silylanization silica gel microcolumn system.

关 键 词：8-羟基喹啉改性有序介孔SiO2涂层毛细管微萃取 形态分析 ICP—MS 铝 水 

分 类 号：O657.63[理学—分析化学]