作　　者： ; ;

机构地区： 华南师范大学化学与环境学院化学系

出　　处： 《分析化学》 1998年第4期414-417,共4页

摘　　要： 新Ｓｃｈｉｆｆｓ试剂糠醛缩７－氨基－８－羟基喹啉－５－磺酸（简称Ｆ７Ｎ８Ｑ５Ｓ）在碱性条件下不稳定，缓慢分解，Ｍｎ（Ⅱ）对该反应具有强烈的催化作用，生成强荧光物质，由此建立了催化荧光测定痕量锰的新方法。实验表明，体系在λex／λem=３２２／３８２（ｎｍ）处，最佳的实验条件为：２５ｍＬ总体积中，有０．０３％Ｆ７Ｎ８Ｑ５Ｓ ３．０ ｍＬ；ｐＨ １０．４的ＮＨ４Ｃｌ／ＮＨ３·Ｈ２Ｏ缓冲溶液 ５．０ｍＬ，反应温度 １００℃；反应时间 ２５ ｍｉｎ。Ｍｎ（Ⅱ）含量在 ０～６０．０ μｇ／Ｌ范围内有良好的线性；检测下限为２．６μｇ／Ｌ。本方法用于实际样品的测定，结果满意。本文还探讨了动力学方程及反应机理。 The reagent,furfura1-7-amino-8-hydroxy-quinoline-5-sulfonic acid,is unstable in base medium,and Mn(Ⅱ)can catalyze greatly the reactin.Based on it,a method for the catalysis-fluorescence determination of Mn(Ⅱ )at λex/λem=322/382 nm was established. The optimum conditions for determination of Mn(Ⅱ) were: 0. 03% furfural-7-amino-8-hydrox- yquinoline-5-sulfonic acid solution 3. 0 mL, pH 10. 4 NH4Cl/NH3H2O solution 5. 0 mL were added in 25 mL measured solution and heated at 100℃ for 25 min. A better linear curve was obtained over the range of 0~60 μg/L and the detection limit for Mn(Ⅱ ) is 2. 6 μg/L. The proposed method has been applied to determine Mn(Ⅱ ) in water and aluminum alloy sam- ples. The mechanism and kinetic equation have also been discussed.

关 键 词： 测定 催化荧光法 锰

领　　域： [理学] [理学]