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本文系统地研究了新试剂２－［２′－（６′－甲基苯并噻唑）偶氮］－５－二甲氨基苯甲酸（简称ＭＢＴＡＭＢ）与Ｆｅ（Ⅱ）的显色反应。试验表明，在非离子表面活性剂Ｔｒｉｔｏｎｘ－１００和无机盐ＮａＣｌ存在下，Ｆｅ（Ⅱ）与ＭＢＴＡＭＢ反应生成１：２的配合物，其λｍａｘ＝６４３ｎｍ，表观摩尔吸光系数为９．２４×１０４Ｌ·ｍｏｌ－１·ｃｍ－１。Ｆｅ（Ⅱ）在０～０．６４μｇ／ｍＬ范围内符合比尔定律。用于测定矿泉水和人发样品的微量铁，结果满意。
In this paper, the color reaction of the new reagent 2- (2 ’- (6’-methylbenzothiazolyl) azo] -5-dimethylaminobenzoic acid (abbreviated as MBTAMB) with Fe (Ⅱ) The results showed that the reaction of Fe (Ⅱ) with MBTAMB in the presence of nonionic surfactant Tritonx-100 and inorganic salt NaCl produced a 1: 2 complex with λmax = 643 nm and an apparent molar absorptivity of 9.24 × 104 L · Mol -1 · cm -1. Beer’s law is obeyed for Fe (Ⅱ) in the range of 0 ~ 0.64 μg / mL. For the determination of trace mineral water and human hair samples, with satisfactory results.