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该文研究了新显色剂２－［２－（６－甲基苯并塞唑）偶氮］－５－二乙氨基苯甲酸（６－Ｍｅ－ＢＴＡＥＢ）的酸碱平衡及其与镍（Ⅱ）的显色反应。实验结果表明，在十二烷基硫酸钠（ＳＤＳ）存在下，６－Ｍｅ－ＢＴＡＥＢ与镍（Ⅱ）在ｐＨ４．５～８．３缓冲溶液中形成稳定的蓝紫色络合物，其组成为Ｎｉ（Ⅱ）∶６－Ｍｅ－ＢＴＡＥＢ＝１∶２，最大吸收波长为６５０ｎｍ，表现摩尔吸光系数为１．６７×１０５Ｌ·ｍｏｌ－１·ｃｍ－１镍（Ⅱ）浓度在０～１０μｍ／２５ｍｌ范围内服从比尔定律。方法可直接用于铝合金中微量镍的测定，结果满意。
In this paper, the acid-base equilibrium of 2- (2- (6-methylbenzothiazyl) azo] -5-diethylaminobenzoic acid (6-Me-BTAEB) Ⅱ) color reaction. The experimental results show that, in the presence of sodium dodecyl sulfate (SDS), 6-Me-BTAEB and nickel (Ⅱ) form a stable blue-violet complex in pH4.5 ~ 8.3 buffer solution, Ni (Ⅱ): 6-Me-BTAEB = 1: 2, the maximum absorption wavelength is 650nm, the molar absorption coefficient is 1.67 × 105L · mol-1 · cm- Be obey Bill’s law within the scope. The method can be directly applied to the determination of trace nickel in aluminum alloy with satisfactory results.