薄层树脂相三元缔合体系分光光度法测定痕量Fe(Ⅲ)的研究  

Study of determination of trace Fe(Ⅲ) with thin layer resin phase based on a ternary complex system and spectrophotometry

作　　者：李松田[1] 舒和庆[1] 徐婉珍[1] 闫永胜[1] 

机构地区：[1]江苏大学化学化工学院

出　　处：《分析试验室》2005年第10期74-76,共3页Chinese Journal of Analysis Laboratory

基　　金：科技部创新基金项目(03C26213200932);江苏大学高级人才基金(04JDG017)

摘　　要：在酸性介质中, Fe(Ⅲ)能与硫氰酸盐生成稳定的络离子[Fe(SCN)4]3-,该络阴离子能被碱性717型阴离子交换树脂定量交换,形成阴离子交换树脂(R+)-金属离子(M+)-硫氰酸盐(SCN-)三元配合物体系,该三元配合物体系最大吸收波长为490 nm.通过制作薄层测定了水中Fe(Ⅲ)量.本法具有很高的灵敏度, ε490=2.4×105 L·mol-1·cm-1,线性范围0～0.40 μg/mL,检出限为0.12 μmol/L.所拟方法用于水中痕量Fe(Ⅲ)的测定,结果与AAS法相吻合.In acidic medium, Fe （Ⅲ） and SCN^- can form stable complex ion [Fe（SCN）6]^3-. R^＋, Mn^＋ and SCN^- can form a ternary complex by exchanging ion with 717 strong alkalescence anion excharge resin. The complex has maximum absorbance at the wavelength of 490 nm. The method has high sensitivity,ε490^Fe（Ⅲ）=2.4×10^5 L·mol^-1·cm^-1. The linear range of 0-10 μg/25 mL and detection limit of 0.12μmol/L were achieved. This method was applied to the determination of trace Fe （Ⅲ） in water samples. As compared with AAS, the detection results were satisfactory.

关 键 词：三元缔合体系 薄层树脂相 分光光度法 痕量Fe(Ⅲ) 

分 类 号：O657.32[理学—分析化学]