5-(3-羧基苯偶氮)-8-氨基喹啉光度法测定铜

Study on the Spectrophotometric Determintion of Copper(Ⅱ)with 5-(3-Carboxylphenylazo)-8-aminoquinoline

研究了新有机试剂５－（３－羧基苯偶氮）－８－氨基喹淋（ｍ－ＣＰＡＱ）的合成、鉴定及其与铜（Ⅱ）的显色反应。在ｐＨ６．６时，Ｃｕ（Ⅱ）与ｍ－ＣＰＡＱ形成１：３的稳定的紫红色络合物。其最大吸收峰在５５４ｎｍ，摩尔吸光系数ε＝７．３×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，铜量在０～１６μｇ／２５ｍｌ范围内符合比尔定律。方法有高的灵敏度和选择性，用于实际样品分析，结果满意。

Carboxylphenylazo)-8-aminoquinoline(m-CPAQ)was synthesized.Copper(Ⅱ)reacts with m-CPAQ to form a stable and red violet complex with the composition ratio of 1:3.The absorption maximum of the complex lies at 554nm with an apparent molar absorptivity of 7.3×10 4L·mol -1 ·cm -1 .Beer’s law is obeyed in 0-16μg/25ml of copper(Ⅱ).This method has high selectivity and sensitivity.It has been applied to the determination of samples with satisfactory results.