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化学学报
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化学学报 ›› 1998, Vol. 56 ›› Issue (2): 184-188. 上一篇    下一篇

研究论文

铁(III)催化多卤代变色酸双偶氮胂类试剂的褪色反应特性及其应用

郑琦;蔡汝秀;林智信   

  1. 华中理工大学汉口分校;武汉大学化学系
  • 发布日期:1998-02-15

The character of PHA decolorizing reaction with iron(III) catalysis and its analytical application

ZHENG QI;CAI RUXIU;LIN ZHIXIN   

  • Published:1998-02-15

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本文研究了铁(III)催化H2O2还原多卤代变色酸双偶氮胂类试剂(PHA)的褪色反应动力学行为, 测定了反应级数和反应活化能, 获得了经验速率方程, 探讨了反应机理, 稳态处理后的动力学方程与经验速率方程相吻合, 说明了机理的合理性。并以三氯偶氮胂为指示反应试剂, 测定了人发中痕量铁的含量, 得到了满意的结果。

关键词: 反应机理, 反应动力学, 铁, 显色反应, 过氧化氢, 偶氮胂, 活化能

kThe decolorizing reaction character of containing-AsO3H2(PHA) polyhalogenated bisazo derivative of chromotropic acid with hydrogen peroxide by iron(III) catalysis has been investigated. In order to study the mechanism of this reaction in acid medium, the reaction order, apparent activation energy and kinetic equation have been determined. In the meantime, influence of the reagent structure on the character of decolorizing reaction has been discussed. This method has also been applied to determine trace iron in human hair with satisfactory results.

Key words: REACTION MECHANISM, REACTION KINETICS, IRON, COLOR REACTION, HYDROGEN PEROXIDE, ARSENAZO, ACTIVATION ENERGY

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