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取代苯甲酸类杂环偶氮染料是一类新型显色剂。这类试剂在钴、镍等的测定中具有灵敏度高、选择性好的特点,但其与铜的显色反应尚未得到重视。本文介绍新合成的2-(2-噻唑偶氮)-5-二乙氨基苯甲酸(简称 TAEB)在水溶液中的性质及其与铜形成配合物的条件和性质,并拟定了铝合金中微量铜的测定方法。1 实验部分1.1 仪器与试剂岛津 UV-3000型紫外-可见分光光度计;pHS-2型酸度计。0.02%TAEB 乙醇溶液;5.0μg/mL 铜标准溶液;pH0.5～3.5的1.0mol/L氯乙酸-氯乙酸钠缓冲液。
Substituted benzoic acid heterocyclic azo dyes are a new type of color developer. Such reagents in the determination of cobalt, nickel and other high sensitivity, good selectivity, but its color reaction with copper has not been given attention. In this paper, the properties of the newly synthesized 2- (2-thiazolylazo) -5-diethylamino benzoic acid (TAEB) in aqueous solution and the conditions and properties of the complex with copper were introduced. Determination of copper. 1 Experimental 1.1 Instruments and reagents Shimadzu UV-3000 UV-Vis spectrophotometer; pHS-2-type pH meter. 0.02% TAEB ethanol solution; 5.0 μg / mL copper standard solution; 1.0 mol / L sodium chloroacetate-sodium chloroacetate buffer solution with pH value of 0.5-3.5.