催化动力学光度法测定痕量对苯二胺.pdf

第22卷第11期
化学研究与应丹
2010年11月
Chemical Research and Application
Nov.,2010
文章编号:1004-1656(2010)1-1392-04
催化动力学光度法测定痕量对苯二胺
赖仁玲,王园朝“,欢明
(杭州师范大学材料与化学化τ学院,浙江杭州310036
关键词:对苯二胺;2-(3,5-一溴-2-吡啶偶氮)5-二乙氨基酚;碘酸钟;催化动力学光度法;染发剂
中图分类号:0657.32文献标识码:A
Catalytic kinetic spectrophotometric determination of trace p-phenylene diamine
LA Ren-ling, WANG Yuan-cha0,OU Ming-h
College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China)
Abstract In the sulfuric acid and 25 C water bath, discoloration reaction during potassium iodate oxidizing 2(3, 5-dibr-2
pyridylazo)-5-diethylaminophenol can be catalyzed by p-phenylene diamine. According to this phenomenon, a new method of trac
p-phenylene diamine determination by catal ytic kinetic spectrophotometry was established. The optimal experimental conditions
were discussed A good linear relationship is obtained in the concentration range of 1. 5 15 m. I for p-phenylenediamine and
the detection limits was 0.08 mg. L. The kinetic parameter of his reaction was also determination and he result showed that the
reaction was first-order reaction. The apparent ratio constant was 8.84x and apparent active energy of the reaction was 7. 17
KJ. mo]". The method proposed was applied to the determination of p-phenylene diamine in hair dye and environmental waste
water, relative standard deviation of results for five consecutive were 3. 7% and 2.3%, and the average recovery ratio were
between98.7%~102.9%
Key words: p-phenylene diamine; 2-(3, 5-dibr-2-pyridylaz) -5-diethylaminophenol; Potassium iodate; catalytic kineti
spectrophotometry; hair dye
对苯二胺是一种重要的化工原料,常用作偶法“3。我国企业标准推荐的是气相色谱法?。
氮染料和硫化染料的中间体,也是合成染发剂中催化动力学光度法是一种操作简便、快速且灵敏
的主要成份,因其对人体有强烈的致敏作用,染发度较高的分析方法,已应用于邻苯二胺”和间莱
剂中最高允许含量为6%。同时对苯二胺也是国二胺0的测定。张建”报道了模拟废水中对苯
际公认的一种致癌物,随着化工工业的迅速发展,二胺的阻抑动力学光度测定方法。本实验发现痕
对苯二胺的废水排放量日益增加,严重污染了环量对苯二胺对碘酸钾氧化2-(3,5-二溴-2-毗啶偶
境,也危害着人体健康。因此,建立…种简单、快須)-5-二乙氮基酚(3,5-diBr- PADAP)的褪色反应
捷的检测染发剂、废水中对苯二胺含量的方法十具有明显的催化作用,据此建立了催化动力学光
分重要。目前报道的测定对苯二胺方法主要有方度法測定对苯二胺的新方法。该方法用于染发剂
波溶出伏安法、气相色谱法23和液相色谱和环境废水中对苯二胺含量的测定,平均加标回
收稿目期:2009-12-17;修回日期:201003-20
基金项目:浙江省大学生创新基金项日
联系人简介:工园朝(1965-),男,教授,主要从事光度和毛细管电泳分析方法研究。Fmil: wangyu:1819@126.cm