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1971年Shibata提出以5-Cl-PADAB(4-[(5-氯-2-吡啶)偶氮]-1,3-二氨基苯)作光度测定钴的新试剂,并且用分光光度法研究了5-Cl-PADAB与钴的反应。用5-Cl-PADAB测定钴时,钯有严重的干扰,因此杨滨湖等及Shibata都研究了5-Cl-PAD-AB与钯的反应,并且制定了光度测定微量钯的方法。卜卫红等研究了5-Cl-PADAB与钯络合物的萃取性能。但是[3,4]两文都没有对这个体系进行较全面的研究,而且有些研究结论也是不一致的。鉴于用5-Cl-PADAB光度测定钯具有较高的灵敏度及选择性,进一步研究这个反应体系是有实际意义的。本文研究了反应的适宜条件,测定了试剂的离解常数、络合物的组成及稳定常数。
Shibata proposed a new reagent for spectrophotometric determination of cobalt with 5-Cl-PADAB (4 - [(5-chloro-2-pyridyl) azo] -1,3-diaminobenzene) in 1971 and studied spectrophotometrically Reaction of 5-Cl-PADAB with Cobalt. Palladium is severely disturbed when 5-Cl-PADAB is used for the determination of cobalt. Therefore, Yang Binhu and Shibata both studied the reaction of 5-Cl-PAD-AB with palladium and developed a method for the photometric determination of trace palladium. BU Wei-Hong et al 5-Cl-PADAB and palladium complex extraction performance. However, [3, 4] did not carry out a comprehensive study of this system, and some of the conclusions are inconsistent. In view of the high sensitivity and selectivity of palladium with 5-Cl-PADAB, further investigation of this reaction system is of practical significance. In this paper, the suitable conditions for the reaction were studied. The dissociation constant, composition and stability constant of the complex were determined.