光度法测定微量铁实验中还原剂的优化选择  

Optimization of Reducing Agent in Spectrophotometric Determination of Trace Iron

作　　者：向晓明[1] 李花 张小林 

机构地区：[1]西北民族大学化工学院,甘肃兰州730030 [2]甘肃医学院,甘肃平凉744000

出　　处：《化学教育》2016年第24期42-44,共3页Chinese Journal of Chemical Education

摘　　要：对分光光度法测定微量铁实验中还原剂的还原效果进行对比研究,结合可见吸收光谱、动力学研究、酸碱环境适应性等实验的分析说明不同还原剂所产生的结果：所选还原剂中盐酸氯丙嗪和维生素C效果最好,盐酸氯丙嗪集还原、增敏于一体,摩尔吸光系数ε=2.60×104 L.mol-1＆#183;cm-1,在含铁量为0.2～2.0 μg/mL范围内线性关系良好,符合朗伯比尔定律,适用于水中微量铁的测定.This paper studied the effect of different reducing agents in the experiment of spectrophotometric determination of trace iron, combined with the analysis of visible absorption spectroscopy, dynamics research, environmental adaptability for acid and alkali. The results showed that reducing effect of chlorpromazine and vitamin C was the best of all selected reducing agents, and their linear relationship was quite good while the iron content ranging from 0. 2 μg/ mL to 2.0 μg/mL, which conformed the Lambert beer＇s law and was suitable for the determina- tion of trace iron in water; chlorpromazine had both reducibility and sensitizing effect, its molar absorption coefficient e was 2. 60× 104 L · mol-1 · cm-1.

关 键 词：微量铁 实验教学 还原剂 邻二氮菲 吸光度 

分 类 号：O657.3[理学—分析化学]