【摘要】 本文研究了meso-四-（对甲氧苯基）卟啉与Zn²⁺、Cd²⁺、Pb²⁺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10⁵数量级以上,四阶导数光谱摩尔响应系数仍在10⁶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。更多还原

【Abstract】 Both common colcur conditions for meso-tetrakis(4-mcthoxyphenyl)porphyrin with Zn, Cd, and Pb, and their simultaneous determination method for derivative spectra calculation analysis have been studied. When the systems of Zn, Cd and Pb in a 0. 06mol/L NaOH solution and in the presence of Tween-80 are heated for 30 min in a boiling water-bath, the mixed colour reaction can quantitativeiy proceed. Their apparent molar absorptivity and fcurth-derivative molar responsive coefficients are cver 10~5 and 10~6 respectively. Aftcr the working wavelengths are selected ty computer, Zn, Cd, and Pb in artificial samples〔Zn: Cd: Pb=0. 05: 2:4～1. 5: 0. 05: 4～0. 2: 3: 0. 2～1. 5: 0. 4: 0. 5(μg/25ml)〕are simultaneously dctcmined by 4th-derivative CPA method. The recovery ratios are in the range of 90～110%.更多还原