2，4－二溴－6－羧基苯重氮氨基偶氮苯光度法测定痕量铊的研究  

Spectrophotometric Determination of Trace Thallium with 2,4-Dibromo-6-carboxyl benzenediazoaminoazobenzene

作　　者：王磊[1] 孙登明[1] 

机构地区：[1]淮北煤炭师范学院化学系

出　　处：《岩矿测试》1994年第1期30-32,共3页Rock and Mineral Analysis

基　　金：煤炭青年科学基金

摘　　要：研究了新试剂２，４－二溴－６－羧基苯重氮氨基偶氮苯与Ｔｌ（Ⅲ）的高灵敏显色反应。在非离子表面活性剂ＴｒｉｔｏｎＸ－１００存在下，于ｐＨ１０．５的ＮＨ＿３·Ｈ＿２Ｏ－ＮＨ＿４Ｃｌ缓冲介质中，Ｔｌ（Ⅲ’）与该试剂生成红色配合物，其配合物的最大吸收波长位于５２０ｎｍ处，摩尔吸光系数为１．８３×１０￣５Ｌ·ｍｏｌ￣－１·ｃｍ￣－１。Ｔｌ（Ⅲ’）量在０～０．６４μｇ／ｍｌ范围内符合比尔定律。方法用于废水中痕量Ｔｌ的测定，结果与其它方法结果相符。测定工业废水及粉煤灰中痕量Ｔｌ的ＲＳＤ（ｎ＝６）在１．６％～３．２％范围。highly sensitive color reaction of thallium(Ⅲ) with 2,4-dibromo -6-carboxyl-benzenediazoaminoazobenzene has been studied.In the presence of Triton X-100 and at pH 10.5 NH_3·H_2O-NH_4Cl buffer,thallium(Ⅲ) reacts with the reagent to form a red complex. The complex exhibits maximum absorption at 520nm with a molar absorptivity of 1.83×10￣5L·mol￣-1·cm￣-1.Beer′s law is obeyed in the range of 0～0.64μg/ml TI(Ⅲ).The present method has been applied to the determination of trace Tl(Ⅲ)in waste water and coal ash with satisfactory results.

关 键 词：铊 比色法 氨基偶氮苯 

分 类 号：O614.373[理学—无机化学]