分光光度法同时测定岩盐中微量Fe^(2+)和Fe^(3+)的研究  

Study on Simultaneous Determination of Trace Fe^(2+) and Fe^(3+) in Rock Salt by Spectrophotometry

作　　者：冉广芬[1] 马海州[1] 

机构地区：[1]中国科学院青海盐湖研究所,青海西宁810008

出　　处：《盐湖研究》2008年第1期22-26,共5页Journal of Salt Lake Research

基　　金：中国科学院知识创新工程重要方向项目(H2X3-SW-346)资助

摘　　要：研究了在酸性条件下,邻-菲啉分光光度法测定岩盐中微量Fe2+、Fe3+。实验结果表明,铁的质量浓度在0~5μg/mL范围内测得吸光度值与质量浓度之间的关系遵守朗伯—比耳定律,摩尔吸光系数ε=1.1×104L.moL-1.cm-1。Fe2+、Fe3+平均回收率分别为102.47%、100.93%,相对标准偏差分别为2.82%、2.68%(RSD,N=6)。该方法操作简单、灵敏度高、稳定性好、选择性好,用于岩盐中微量Fe2+、Fe3+的测定,结果令人满意。In the acid condition,trace Fe^2＋ and Fe^3＋ in rock salt were determined by o-phenanthroline Spectrophotometry. The experimental results showed that the Lambert-Beer＇ s law was obeyed when the concentration of iron was in the range of 0 ～ 5μg/mL and the molar absorption coefficient was 1.1×10^4 L·mol^-1·cm^-1. The average recoverise of Fe^2＋ and Fe^3＋ were 102.47% and 100.93% with relative standard deviation of 2.82% and 2.68（RSD, N = 6） respectively. This method was proved to be rapid, sensitive, simple and accurate. The application of this method to determine the trace Fe^2＋ and Fe^3 ＋ in rock salt gives satisfactory results.

关 键 词：分光光度法 岩盐 微量 邻-菲啰啉 Fe^2+、Fe^3+ 

分 类 号：O657.32[理学—分析化学]