【摘要】 研究了4（2-吡啶偶氮）间苯二酚（PAR）对镉与四（4-三甲胺基苯基）卟啉（TAPP）的催化反应,在pH8.50的硼砂-盐酸缓冲介质中,单偶氮试剂PAR能加速Cd（Ⅱ）与TAPP的反应.反应在室温下即刻完成,配合物组成为Cd（Ⅱ）:TAPP=1:2,配合物稳定常数K_?=2.6×10⁶,最大吸收波长位于431nm,表观摩尔吸光系数为 4.4×10⁵,Cd（Ⅱ）含量在0～4.4μg/10ml范围内服从比耳定律,将拟定的方法应用于工业废水中镉的测定,结果满意,初步探讨了PAR催化Cd（Ⅱ）与TAPP反应的可能机理。更多还原

【Abstract】 It is found that the color reaction of Cd (Ⅱ) with T-(4-TMAP)P (TAPP) is catalyzed by the monoazo reagent PAR in a borate buffer medium of pH8. 5. Under the optimum condition establishted, the reac-tion goes to completion instantaneously at room temperature. The composition ratio of the complex is Cd : T-(4-TMAP)P=1 : 2. The stability constant of the complex is 2. 6×106. The absorption maxima of the complex lies at 431nm and its apparent molar absorptivity is 4. 4×105. Beer’s law holds in the concentration range of 0-4. μg/10ml for cadmium. The proposed method has been applied to the determination of Cd(Ⅱ) in industrial waste water with satisfactory results. A discussion on the mechanism of the catalytic effect of PAR is also made.更多还原