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 . Beers 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.
出处
《分析科学学报》
CAS
CSCD
1998年第3期222-224,共3页
Journal of Analytical Science
