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金属离子、有机溶剂与三氮烯偶氮类试剂存在一定的超分子作用,有机试剂与缓冲介质的浓度及种类对显色体系的灵敏度有很大的影响。本文据此建立了乙醇存在下的镉试剂与镍的显色反应的新体系。在pH 9.5的硼砂-NaOH缓冲介质中,在表面活性剂吐温-80存在下,镉试剂与镍反应生成2∶1稳定配合物;吸收波长λmax为504 nm,摩尔吸光系数1.37×105L.mol-1.cm-1;镍含量在0.0~8.0μg/mL范围内符合比尔定律。方法已用于测定铝合金中微量镍。
Metal ions, organic solvents and triazoles azo reagent existence of some supramolecular effects, the concentration of organic reagents and buffer medium and the type of the sensitivity of the color system has a great impact. Based on this, a new system for the color reaction of cadmium with nickel in the presence of ethanol was established. In pH 9.5 borax-NaOH buffer medium, cadmium reagent reacted with nickel to form stable 2: 1 complex in the presence of surfactant Tween-80. The absorption wavelength λmax was 504 nm and the molar absorptivity was 1.37 × 105 L · mol -1.cm-1; Beer’s law is obeyed in the range of 0.0 ~ 8.0μg / mL. The method has been used to determine trace amounts of nickel in aluminum alloys.