新苯并噻唑偶氮类显色剂BTAB光度法测定微量铁  

Spectrophotometric Determination of Trace Fe by New Benzothiazole Reagent BTAB

作　　者：范志宏[1] 郭安城[2] 郭晓宇[3] 

机构地区：[1]山西农业大学文理学院,山西太谷030801 [2]山西大学化学化工学院,山西太原030006 [3]山西农业大学林学院,山西太谷030801

出　　处：《现代科学仪器》2009年第6期74-76,共3页Modern Scientific Instruments

基　　金：山西农业大学科技创新基金资助项目(2006021)

摘　　要：研究了新显色剂3-(6-溴苯并噻唑-2-偶氮)-2,6-二羟基苯甲酸(BTAB)与铁的显色反应及高纯石英砂中微量铁的测定。在pH=6.2的醋酸盐缓冲体系和溴代十六烷基吡啶溶液(CPB)存在下,BTAB与Fe(II)形成1:2的红色配合物,在566.0nm处有最大吸收,稳定常数为5.10×109,摩尔吸光系数为1.183×104L/(mol?cm),铁含量在0～2.54μg/mL内符合朗伯-比耳定律,建立了一种新的Fe(II)的测定方法。反应有很好的选择性。不经分离、掩蔽可直接测定高纯石英砂中微量铁。The highly sensitive and selective color reaction of a new benzothiazole reagent 3-（6-bromobenzole-2-azo）- 2,6-dihydroxy benzoic acid （BTAB） with Fe（II） and trace Fe determination in high purity quartz sand has been studied. The result show that in the presence of CPB and at pH=6.2 the reagent reacts with Fe（II） to form a red complex with a molar ratio of 2：1. Its apparent molar absorptivity is 1.183×10^4L/（mol.cm） and its maximum absorption wave-length is 566.0nm,stability constant is 5.10×10^9. Beer＇s law is obeyed in the range of 0D2.54μg/mL. The method has been used for the determination of trace iron in high purity quartz sand with satisfactory results.

关 键 词：微量铁 分光光度分析 5-(6-溴苯并噻唑-2-偶氮)-2  6-二羟基苯甲酸 高纯石英砂 

分 类 号：O614.811[理学—无机化学]