meso－四（3－氟－4－磺基苯）卟啉与钯（Ⅱ）显色反应的分光光度研究

Spectrophotometric Study on Color Re-action of meso-Tetra(3-fluoro-4-sul-fophenyl)porphyrin with Palladium(Ⅱ)

本文对新多卤代水溶性ｍｅｓｏ－四（３－氟－４－磺基苯）卟啉与Ｐｄ（Ⅱ）的显色反应进行了研究，在ｐＨ４．８，有抗坏血酸存在，沸水浴中加热，形成稳定的１：１配合物，最大吸收波长在４０９ｎｍ处。工作曲线回归方程Ａ＝０．００１＋０．０６４ｘ，相关系数ｒ＝０．９９６４。摩尔吸光系数达１．７×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），Ｐｄ（Ⅱ）浓度在０～７．５μｇ／２５ｍＬ范围内符合比耳定律。灵敏度和选择性高于其它多卤代水溶性卟啉。对催化剂中钯含量的测定，获得满意的结果。

A new water-soluble reagent,meso-te-tra-( 3-fluoro-4-sulfophenyl ) porphyrin hasbeen used for the spectrophotometric deter-mination of palladium(Ⅱ).In the presenceof ascorbicacid,at pH 4. 8 and heated in aboiling water bath,the porphyrin reagentreacts to form a 1 :1(M: L)complex withPd(Ⅱ).The maximum absorption wave-length of the complex is 409nm,The re-gression equation of palladium concentra-tion is A=0.001 +0. 064x ,correlation coef-ficient r=0.9964,and the molar absorptivi-ty is 1.7 × 10￣5 L·mol￣(-1)·cm￣(-1). Beer’s lawis obeyed for Pd(Ⅱ)in the range of 0～7.5μg/25mL. The sensitivity and selectivityare both better than other methods.Themethod hasbeen applied to determine palla-dium(Ⅱ)in catalyst with satisfactory re-sults.