新试剂TADCAB双波长光度法测定天然水中的痕量铜

Dual-wavelength spectrophotometric determination of trace copper in natural water by a new reagent 2-(2-thiazolylazo)-5-[(N,N-dicarboxymethyl) amino] benzoic acid

研究了新显色剂２－（２－噻唑偶氮）－５－［（Ｎ，Ｎ－二羧基甲基）氨基］苯甲酸与铜的显色反应，在ｐＨ４．０，铜与显色剂形成１：２蓝色络合物，其最大吸收波长为６０３ｎｍ，用双波长测定法，其表观摩尔吸收系数ε６０３－４９２＝７．２３×１０４Ｌ·ｍｏｌ－１·ｃｍ－１。铜离子的浓度在０～１．２μｇ／ｍＬ范围内符合比尔定律。方法用于天然水经锌试剂负载树脂分离和富集后痕量铜的测定，结果与ＡＡＳ一致。

The color reaction of copper(Ⅱ) with a new reagent 2- (2-thiazolylazo)-5-[(N, N-dicarboxyme thyl) amino] benzoic acid (TADCAB) is discussed.After trace copper in natural waters has been separated and preconcentrated by zincon loaded resin, it can be determined by this method with satisfactory results.