阻抑乙基橙褪色动力学光度法测定痕量铁(Ⅲ)  

Kinetic Spectrophotometric Determination of Trace Iron(Ⅲ) Based on Inhibitory Reaction of Ethyl Orange

作　　者：李艳霞[1] 陈亚红[1] 

机构地区：[1]周口师范学院化学系,河南周口466000

出　　处：《分析科学学报》2013年第2期288-290,共3页Journal of Analytical Science

基　　金：河南省高等学校青年骨干教师资助计划(No.2010GGJS-154);周口师范学院实验室开放项目(201110)

摘　　要：在H2SO4介质中,痕量铁(Ⅲ)对KBrO3氧化乙基橙褪色反应有很强的阻抑作用,利用光度法检测阻抑反应过程中乙基橙浓度的变化,建立了铁(Ⅲ)-溴酸钾-乙基橙体系阻抑动力学光度法测定痕量铁(Ⅲ)的方法。在选定条件下,方法的线性范围为0.006～0.32μg/mL,检出限(3s/k)为0.0031μg/mL。In a dilute sulfuric acid medium,trace Fe（Ⅲ） showed strong inhibitory effect on the fading reaction of ethyl orange oxidized by potassium bromate. The change of ethyl orange concentration in inhibitory reaction was monitored by sepctrophotometry. A new method for the determination of trace Fe（ Ⅲ ） by inhibitory kinetics spectrophotometry in Fe（ Ⅲ）-KBrO3-ethyl orange system was established. The detection limit was 0. 0031 μg/mL,and the linear range of method was 0. 006-0.32 μg/mL.

关 键 词：铁(III) 乙基橙 阻抑反应 动力学光度法 

分 类 号：O657.3[理学—分析化学]