TC－偶氮胂－高碘酸钾－钌（Ⅲ）退色反应在痕量钌的分光光度测定中的应用  

Spectrophotometric determination of micro amounts of ruthenium using TC-arsenazo and KIO_4

作　　者：刘锡林[1] 寇宗燕[1] 陈兴国[1] 胡之德[1] 

机构地区：[1]甘肃教育学院化学系,兰州大学化学系

出　　处：《化学试剂》1994年第5期277-278,313,共3页Chemical Reagents

摘　　要：在痕量钌（Ⅲ）的存在下，显色剂ＴＣ－偶氮胂与ＫＩＯ＿４在１．０ｍｏｌ／ＬＨ＿２ＳＯ＿４介质中加热至沸，退色反应在３ｍｉｎ内完成且与钌的含量具有良好的线性关系。在此基础上建立了痕量钌的催化分光光度分析法。其检出限可达０．０２μｇ／１０ｍＬ。钌含量在０．０４～０．４０μｇ／１０ｍＬ范围内符合朗－比定律。本文提出了退色反应的最佳条件及贵金属精矿中痕量钌的测定法。TC-arsenazo can not be faded by KIO4 in 1 .0mol/L H2SO4 and boiling water, however, when micro amount of Ru(Ⅲ) is present the fading reaction can be accomplished in three minutes. A new catalytic spectrophotometric method for the determination of ruthenium has thus been established based.on the catalytic action of Ru(Ⅲ) on the oxidative fading of TC-arsenazo with KIO4. The detection limit was found to be 0.02μg/10mL. Beer's law is obeyed from 0.04 to 0.40μg/10mL. The method offers the advantages of simplicity, rapidity and selectivity.The method has. been used to determine micro amonuts of ruthenium in refined ores.

关 键 词：偶氮胂 钌 光度法 催化 退色反应 

分 类 号：O614.821[理学—无机化学]