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取代苯甲酸类杂环偶氮染料是近年来发展起来的新显色剂,本文研究新显色剂2-(2-噻唑偶氮)-5-二甲基氨是基苯甲酸(简称TAIVIB)用于测定铝合金中的微量铜。在pH 3.0氯乙酸-氯乙酸钠缓冲溶液中,无掩蔽剂存在下,TAMB与铝合金中的微量铜形成稳定的蓝色配合物,其最大吸收波长为635nm,摩尔吸光系数达5×10~4,在0～25μg/50ml内符合比耳定律。该法的选择性好,显色稳定,测量结果十分令人满意。
Substituted benzoic acid heterocyclic azo dye is a new developer developed in recent years. In this paper, the new color reagent 2- (2-thiazolylazo) -5-dimethylaminobenzoic acid (TAIVIB) For the determination of trace amounts of copper in aluminum alloys. In the buffer solution of sodium chloroacetate - sodium chloroacetate at pH 3.0, TAMB forms a stable blue complex with a trace amount of copper in the aluminum alloy without masking agent. Its maximum absorption wavelength is 635 nm and the molar absorptivity reaches 5 × 10 ~ 4, Beer’s law is in 0 ~ 25μg / 50ml. The method of good selectivity, color stability, the measurement results are very satisfactory.