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本文研究了meso-四-(对甲氧苯基)卟啉与Zn~(2+)、Cd~(2+)、Pb~(2+)的共显色条件和导数光谱行为,并提出用四阶导数光谱同时测定该三组份含量的计算分析方法。在Tween-80存在下,在0.06mol/L的NaOH介质中,于沸水浴上加热30min,Zn、Cd、Pb混合体系能较好地显色。其表观摩尔吸光系数在10~5数量级以上,四阶导数光谱摩尔响应系数仍在10~6数量级以上。通过计算机精选工作波长后,用四阶导数CPA法同时测定合成样品中的锌、镉、铅〔Zn:Cd:Pb=0.05:2:4～1.5:0.05:4～0.2:3:0.2～7.5:0.4:0.5(μg/25ml)〕回收率在90～110(％)之间。
In this paper, the conditions of co-coloration and derivative spectra of meso-tetrakis- (p-methoxyphenyl) porphyrin with Zn2 +, Cd2 +, Pb2 + Fourth-order derivative spectra Simultaneous determination of the three components of the calculation and analysis methods. In the presence of Tween-80, 0.06mol / L NaOH medium, heated in a boiling water bath for 30min, Zn, Cd, Pb mixed system can better color. The apparent molar absorptivity is in the order of 10-5 and the fourth order derivative molar response coefficient is still above 10-6. After selecting the working wavelength by computer, the fourth derivative CPA method was used to simultaneously determine the contents of zinc, cadmium and lead in the synthesized samples [Zn: Cd: Pb = 0.05: 2: 4 ~ 1.5: 0.05: 4 ~ 0.2: 3: 0.2 ~ 7.5: 0.4: 0.5 (μg / 25 ml)] Recovery was between 90 and 110 (%).