微乳液-CTMAB-5-Br-PADAP分光光度法测定微量铁  

Spectrophotometric Determination of Trace Iron(Ⅱ) with Microemulsion-CTMAB-5-Br-PADAP

作　　者：陈岱新 衷明华[2] 赵丹娜 

机构地区：[1]玉湖中学,广东省揭东县玉湖镇515535 [2]韩山师范学院化学系,广东省潮州市521041 [3]金禧中学,广东省汕头市515000

出　　处：《光谱实验室》2005年第3期513-515,共3页Chinese Journal of Spectroscopy Laboratory

摘　　要：2-(5-溴-2吡啶偶氮)-5-二乙氨基苯酚(5-Br-PADAP)与Fe(Ⅱ)形成稳定的红色络合物在微乳液存在下的增溶增敏效果。有两个吸收峰,分别位于554nm和750nm,在554nm处络合物的表观摩尔吸光系数为8.35×104L·mol-1·cm-1,铁的含量在0-1.2μg/mL范围内符合比耳定律。该法具有高的选择性和灵敏度,用于水样中微量铁的测定,结果令人满意。The deliquesce and sensitized reaction of Iron (Ⅱ) with 2-( 5-Bromo-2-pyridylazo )-5-diethylaminophenol(5-Br-PADAP)is accelerated by microemulsion,which forms a cerise(abbut pH = 4. 0) complex with two maxium absorption wavelengths at 554nm and 750nm. The apparent molar absorptivity at 554nm is 8. 35×104L·mol-1·cm-1. Beer's law is obeyed in the range of 0-1. 2μg/mL. This method has a good selectivity and high sensitivity, and was applied to the determination of iron with satisfactory results.

关 键 词：微乳液 铁(Ⅱ) 2-(5-溴-2吡啶偶氮)-5-二乙氨基苯酚 分光光度法 

分 类 号：O657.32[理学—分析化学]