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.
出处
《岩矿测试》
CAS
CSCD
北大核心
1994年第1期30-32,共3页
Rock and Mineral Analysis
基金
煤炭青年科学基金
关键词
铊
比色法
氨基偶氮苯
spectrophotometry,2,4-dibromo-6-carboxylbenzenediazoaminoazobenzene,thallium determination
