5,10,15,20-四(3-氯-4-磺酸苯基)卟啉的合成及其与银显色反应的研究

• 作 者: 汤福隆 王莉红 毛雪琴 林媚
• 机 构: 杭州大学化学系,杭州大学化学系,杭州大学化学系,杭州大学化学系 杭州 310028,杭州 310028,杭州 310028,杭州 310028
• 出 处: 冶金分析
• 发表日期: 1992年04期
• 关键词: 显色反应 稳定常数 CTMAB 比尔定律 银含量 朗伯 最大吸收波长 吸光度 离解常数 银离子

报道了水溶性卟啉T(3-CP)PS_4的合成方法,研究了试剂与银离子的显色反应条件,测定了试剂的离解常数pKa_3,4为3.90。当Pb~(2+)和CTMAB存在时,配合物的最大吸收波长位于427.2nm处,表观摩尔吸光系数为3.23×10~5,配合比为1:1,稳定常数K=4.91×10~7,银含量在0～6μg/25ml范围内符合朗伯—比尔定律。本法可用于阳极泥和光谱底片中微量银的测定。

The synthesis of water-soluble porphyrin T (3-CP) PS_4 was reported. The conditions for the color reaction of the reagent with silver ion were studied. The dissociation constant pKa_3,4 of the reagent was 3.90. When Pb 2+ and CTMAB were present, the maximum absorption wavelength of the complex was located at 427.2 nm. The apparent molar absorptivity was 3.23 × 10 ~ 5, with a ratio of 1: 1. The stability constant K was 4.91 × 10 ~ 7, silver content in the range of 0 ~ 6μg / 25ml in line with Lambert-Beer’s law. This method can be used for the determination of trace silver in anode slime and optical film.