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用一般的分光光度法不能同时测定微量的镍(Ni~(2+))、锌(Zn~(2+))和铜(Cu~(2+)),因为这三种离子的光谱带严重重叠,互相干扰,所以必须分离后进行测定。本文介绍用二阶导数分光光度法可同时铡定微量的镍、锌和铜,它是根据Ni~(2+),Zn~(2+)、Cu~(2+)与1-(2-吡啶偶氮)-2-萘酚(PAN)形成络合物,其二阶导数光谱峰明显分离,基线到峰顶的距离与Ni~(2+),Zn~(2+),Cu~(2+)离子浓度呈正比关系。本法操作简单,灵敏,快速,适用于药物分析和环境监测。
With conventional spectrophotometry, trace amounts of nickel (Ni2 +), zinc (Zn2 +) and copper (Cu2 +) can not be measured at the same time because the spectral bands of these three ions are severe Overlap, interfere with each other, it must be separated after the determination. In this paper, trace amounts of nickel, zinc and copper can be simultaneously determined by the second derivative spectrophotometry. It is based on Ni 2+, Zn 2+, Cu 2+ and 1- (2- Pyridinium azo) -2-naphthol (PAN). The second derivative spectra of the complexes were obviously separated, and the distance from the baseline to the top of the peak was almost the same as that of Ni 2+, Zn 2+, 2+) ion concentration is proportional to the relationship. This method is simple, sensitive and rapid, suitable for drug analysis and environmental monitoring.