在丙酮介质中2－（4，5－二甲基－2－噻唑偶氮）－5－二甲氨基苯甲酸光度法测定微量钯的研究  

Study of Spectrophotometric Determination of Trace Palladium with 2-(4, 5-Dimethyl-2-Thiazolylazo)-5-Dimethylaminobenzoic Acid in the Presence of Acetone

作　　者：胡琴[1] 张光 

机构地区：[1]新疆大学理化测试中心,陕西师大化学系

出　　处：《新疆大学学报（自然科学版）》1994年第2期76-78,共3页Journal of Xinjiang University(Natural Science Edition)

摘　　要：本文研究了２－（４，５－二甲基－２－噻唑偶氮）－５－二甲氨基苯甲酸（简称ＤＭＴＡＭＢ）与钯的显色反应．实验结果表明．在ｐＨ３．６～４．８范围内．在２８％丙酮介质中，ＤＭＴＡＭＢ与钯可形成稳定的蓝绿色络合物，络合比为Ｐｄ（２－）：ＤＭＴＡＭＢ＝１：１．络合物表现摩尔吸光系数ε（７０４）＝７．２×１０４Ｌ·ｍｏｌ１·ｃｍ１，钯浓度在０～３０μｇ／２５ｍｌ范围内遵守比耳定律．本法不经预分离用于钯精矿样、含钯分子筛及含钯电镀液样品的测定，结果满意．A sensitive photometric method for the determination of Pd (Ⅱ) with 2-(4, 5-dimethyl-2-thiazolylazo)-5-dimethylaminobenzoic acid (DMTAMB ) has been studied. The experimental results indicate that in the presence of acetone at pH3.6￣4.8,Pd (Ⅱ) reacts with DMTAMB to form a stable blue-green 1: 1 complex with apparent molar absoptivity of 7.2×104 L·mol 1·cm 1 at 704 nm. Beer's law is obeyed in the range of 0￣30μg/25ml for Pd(Ⅱ). This method has been applied to the determination of Pd(Ⅱ) in samples containing Pd with satisfactory results.

关 键 词：噻唑偶氮苯甲酸 分光光度法 钯 

分 类 号：O654.32[理学—分析化学]