光度法测定微量铁实验中表面活性剂增敏性的研究  

Sensitizing Effects of Surfactants in Spectrophotometric Determination of Trace Iron

作　　者：戴兴德 张爱菊[1] 张小林[1] 

机构地区：[1]甘肃省平凉医学高等专科学校

出　　处：《化学教育》2015年第20期30-32,共3页Chinese Journal of Chemical Education

摘　　要：对分光光度法测定微量铁实验中表面活性剂的增敏效果进行对比研究,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表面活性剂所产生的结果：阳离子表面活性剂增敏明显,十八烷基三甲基溴化铵和十四烷基溴化吡啶混合使用效果最好,吸光度增加84%,摩尔吸光系数ε=4.4×10^4,在含铁量为0.1~1.5μg/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 article studied the sensitizing effects of surfactants in the experiment of spec- trophotometric determination of trace iron, described the results of different surfactants combined with the analysis of visible absorption spectroscopy, kinetic research, acid and alkali environment adaptability. The research showed that sensitizing effects of the cationics was obvious, mixed use of trimethyl ammonium bromide and fourteen alkyl pyridine bromide had the best sensitizing effects. The absorbance could be increased nearly 84%, the molar absorption coefficient εwas 4. 4×10^4, and the linear relationship was quite good while the concentration range of iron was 0.1 1.5 μg/mL, which conformed the Lambert Beer＇s law and was suitable to measure trace iron in the water.

关 键 词：分析化学 实验教学 表面活性剂 邻二氮菲 吸光度 

分 类 号：G642[文化科学—高等教育学] O657.3-4[文化科学—教育学]