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研究了新试剂间 -三氟甲基偶氮羧与 Ca( )、Mg( )的显色反应。在 p H2 .0的 HCl-Na Ac介质中 ,间 -三氟甲基偶氮羧与 Ca( )、Mg( )均生成组成比为 1∶ 2的紫红色配合物 ,其最大吸收波长的位置在 6 91 nm和 6 94nm,摩尔吸光系数为 5 .6× 1 0 5L· mol- 1· cm- 1、8.9× 1 0 5L· mol- 1· cm- 1,两种离子浓度分别在 0～ 6 0 μg/ L、0～ 5 0 μg/ L 范围内符合比尔定律。将此法用于离子膜制碱工艺中一次精制盐水的中控分析 ,应用超定方程组对样品中 Ca2 +、Mg2 +进行同时测定 ,结果令人满意。
The color reaction between the new reagent - trifluoromethyl azocarboxylate and Ca (superscript 2 +) and Mg (superscript 2 +) was studied. In the HCl-Na Ac medium of p H2 .0, m-trifluoromethylcarboxylazo and Ca (superscript 2) and Mg (superscript 2) all produce the fuchsine complex with the compositional ratio of 1: 2, and the position of maximum absorption wavelength At 6 91 nm and 6 94 nm, the molar absorptivities were 5.6 × 10 5 L · mol -1 · cm -1, 1.8 × 10 5 L · mol -1 · cm -1, and the two ion concentrations were 0 ~ 6 0 μg / L, 0 ~ 50 μg / L in line with Beer’s law. The method was applied to the central control analysis of a refined brine in the process of ion-exchange membrane alkali making. The determination of Ca2 + and Mg2 + in the sample by overdetermined equations was satisfactory.