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铕(Ⅲ)-2-(5-溴-2-吡啶偶氮)-5-二乙氨基苯酚-溴化十六烷基三甲铵显色反应的研究
Study on the Colour Reaction of Europium (Ⅲ) with 2-(5-Bromo-2-Pyridylazo)-5-Diethylaminophenol and Cetyltrimethyl Ammonium Bromide
【摘要】 研究了铕 ( ) - 5 - Br- PADAP- CTMAB体系的显色反应和光度性质 ,并探讨了其最佳的光度分析条件。在 p H =5 .0的 HAc- Na Ac缓冲溶液中 ,有表面活性剂 CTMAB存在的条件下 ,Eu( )与 5 - Br-PADAP形成了配位比为 1∶ 2的深红色络合物。配合物的最大吸收峰位于 5 98nm,表观摩尔吸光系数为1.5 9× 10 5L· mol-1· cm-1,铕含量在 0— 10μg/ 2 5 m L范围内符合比耳定律。加标回收实验结果令人满意。
【Abstract】 The spectrophotometric properties of europium(Ⅲ) with 2 (5 Bromo 2 pyridylazo) 5 diethylaminophenol (5\|Br\|PADAP) and cetyltrimethyl ammonium bromide (CTMAB) colour system were studied. A red complex is formed in pH 5 0 acetate buffer solution in the presence of CTMAB, and the mole ratio of the complex of Eu(Ⅲ) with 5 Br PADAP is 1∶2. The maximal absorption of the complex is at 598nm with a apparent molar absorptivity of 1 59×10 5L·mol -1 ·cm -1 . Beers law is obeyed over the range of 0-10μg/25mL for Eu(Ⅲ).
【Key words】 Europium； 2 (5 Bromo 2 Pyridylazo) 5 Diethylaminophenol； Spectrophotome\|try.；
- 【文献出处】 光谱实验室 ,Chinese Journal of Spectroscopy Laboratory , 编辑部邮箱 ,2002年03期
- 【分类号】O657.32
- 【被引频次】5
- 【下载频次】46