高等学校化学学报 ›› 1996, Vol. 17 ›› Issue (4): 535.

• 论文 • 上一篇    下一篇

流动注射光纤荧光探针动力学法测定铁的研究

章竹君, 王军锋   

  1. 陕西师范大学化学系, 西安 710062
  • 收稿日期:1995-05-29 出版日期:1996-04-24 发布日期:1996-04-24
  • 通讯作者: 章竹君,男,57岁,教授,博士生导师.
  • 作者简介:章竹君,男,57岁,教授,博士生导师.
  • 基金资助:

    国家自然科学基金

Determination of Iron(Ⅲ)by Fiber Optic Kinetic Method with Flow Injection Analysis and Fluorescent Probe

ZHANG Zhu-Jun, WANG Jun-Feng   

  1. Department of Chemistry, shaan'xi Normal University, Xi'an 710062
  • Received:1995-05-29 Online:1996-04-24 Published:1996-04-24

摘要: 研究了8-苯胺基-1-萘磺酸作为表面活性剂胶束荧光探针的性质,并将其用作动力学分析的荧光指示剂。建立了以铁(Ⅲ)催化过氧化氢氧化ANS-Brij35体系荧光猝灭反应为基础,用流动注射和光导纤维技术测定痕量铁的动力学分析新方法。该法线性范围为5~300ng/mL,检测下限为2ng/mL,绝对检出量为0.2ng,对20ng/mL铁(Ⅲ)进行11次测定相对标准偏差为0.27%,可直接用于人发、纯铝和铝合金中铁的测定。

关键词: 铁, 荧光探针, 催化动力学, 流动注射分析, 光导纤维光谱法

Abstract: The properties of anmnonaphthalene-8-sulfonic acid(ANS)as the fluorescentprobe of surface active agent have been studied.The micellar assemblies of ANS-Brij35 hasfirst been used as kinetic indicator of fluorescence.Anew method using flow injection analysis(FIA) and fiber optic to determine iron(Ⅲ)has been developed based upon the fluorescence quenching of ANS-Brij35 by the oxidation of hydrogen peroxide, in which the iron(Ⅲ)is an effective catalyst.The linear calibration curve of iron(Ⅲ)is obtained in the range of 5~300 ng/mL.The limit of detection is 2 ng/mLand the absolute detection limit is 0.2ng.The relative standard deviation is 0.27%(n=11)at the level of 20 ng/mLiron(Ⅲ).Thismethod has been applied to the determination of iron in human hair, aluminum and aluminumalloy without pre-separation.

Key words: Iron, Fluorescent probe, Catalytic kinetics, Flow injection analysis, Fiber opticspectrometry

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