新显色剂5-(5-氯-2-羟基苯偶氮)若丹宁与Au(Ⅲ)显色反应的应用研究  

A Study on the Colour Reaction of Gold(Ⅲ ) with a New Reagent 5 Chloro 2 Hydroxybenzenazorhodanine and Its Application

作　　者：潘教麦[1] 沈绍典[1] 

机构地区：[1]华东师范大学化学系

出　　处：《分析科学学报》1998年第3期222-224,共3页Journal of Analytical Science

摘　　要：研究了新显色剂５－（５－氯－２－羟基苯偶氮）若丹宁与Ａｕ（Ⅲ）的显色反应．在１ｍｏｌ·Ｌ－１左右的盐酸介质中，Ａｕ（Ⅲ）与试剂形成１∶１的橙红色配合物，最大吸收峰位于５４０ｎｍ，表观摩尔吸光系数为５．７５×１０４Ｌ·ｍｏｌ－１·ｃｍ－１．大量碱金属、碱土金属和有色金属离子不干扰测定，贵金属元素除钯外，也有较大的允许量，该反应选择性较好，灵敏度较高，无须加掩蔽剂，方法可用于含金废水中金的测定。A highly sensitive and selective procedure for the spectrophotometric determination of gold(Ⅲ) has been developed.In 1mol·L -1 HCl medium,gold(Ⅲ)forms an orange red complex with 5 chloro 2 hydroxybenzenazorhodanine(Cl HBAR) which has an absorption maximum at 530nm.The molar absorptivity is 5.75×10 4L·mol -1 .cm -1 . Beers law is obeyed for gold(Ⅲ) in the range of 0￣60μg/25mL.Large amounts of alkali、alkaline earth and non ferrous metals do not interfere with the determination.The method has been applied to the determination of gold(Ⅲ) in waste water with satisfactory results.

关 键 词：若丹宁衍生物 分光光度法 金 显色反应 测定 

分 类 号：O614.123[理学—无机化学]