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光度法测定铜的显色剂虽然很多,但是选择性好,能在水溶液中直接进行测定的试剂却很少。从铜(Ⅱ)的化学性质来考虑,邻,邻’-二氨基偶氮苯(简称DAAB)可能是光度法测定铜(Ⅱ)的良好显色剂。本文对DAAB的合成方法作了改进,用改进过的方法合成了DAAB;并对Cu(Ⅱ)-DAAB-SDBS-Triton X-100新显色体系作了系统的研究,得到了令人满意的结果。 1.试剂和仪器: DAAB(作者合成):0.04％乙醇溶液。铜标准溶液:将高纯金属铜溶于硝酸,加盐酸除尽硝酸。配成浓度为50μg/ml。
Spectrophotometric determination of copper, although a lot of color reagent, but the selectivity is good, can be directly measured in aqueous solution reagents are very small. From the chemical properties of copper (Ⅱ), ortho - o - diaminoazobenzene (DAAB) may be a good reagent for the spectrophotometric determination of copper (Ⅱ). In this paper, the synthesis of DAAB was improved, and the DAAB was synthesized by the improved method. The new color system of Cu (Ⅱ) -DAAB-SDBS-Triton X-100 was systematically studied and satisfactory result. 1. Reagents and Instruments: DAAB (author synthesis): 0.04% ethanol solution. Copper standard solution: The high-purity copper metal dissolved in nitric acid, add hydrochloric acid to remove nitric acid. Dubbed the concentration of 50μg / ml.