2-(2-噻唑偶氮)-5-[(N,N-二羧甲基)氨基]苯磺酸与金显色反应研究及其应用  

Spectrophotometric Studies on the Colour Reaction of 2-(2- Thiazolylazo)-5-[(N,N-Dicarboxymethyl)Amino]Benzenesulfonic Acid with Gold(III) and Its Application

作　　者：陈金媛 李超琳 童培泳 汤福隆[1,2] 

机构地区：[1]浙江省建筑材料工业学校 [2]杭州大学环科系

出　　处：《分析科学学报》1998年第3期234-236,共3页Journal of Analytical Science

摘　　要：研究了显色剂２－（２－噻唑偶氮）－５－［（Ｎ，Ｎ－二羧甲基）氨基］苯磺酸（简称ＴＡＤＣＡＢＳ）与金（ＩＩ）的显色反应．结果表明，在０．３ｍｏｌ／ＬＨ３ＰＯ４介质中，ＴＡＤＣＡＢＳ与金形成稳定的深红色的３∶１配合物，其最大吸收波长５７５ｎｍ，金浓度在０～５０μｇ／２５ｍＬ范围内符合比耳定律，表观摩尔吸光系数ε５７５为１．４５×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，方法用于测定阳极泥及含硫金矿中微量金。It was studied in detail that a reagent 2-(2-thiazolylazo)-5-[(N,N-dicarboxymethyl) Amino] benzenesulfonic acid(abbreviate as TADCABS) reacted with gold(Ⅲ) in the medium of 0.3mol/LH 3PO 4 to produce a deep red complex(R∶Au=3∶1) Which the maximum absorption wavelength is at 575nm. Beer's law is obeyed in the ranged of 0～50(g/25mL Au(Ⅲ). The apparent molar absorptivity is 1.45×(104 L·mol -1 ·cm -1 . The method has been used to the determination of gold in anode mud and gold ore with satisfactory results.

关 键 词：TADCABS 显色反应 分析 金 分光光度法 

分 类 号：O614.123[理学—无机化学]