5—（偶氮苯）—8—（4—硝基—1—重氮苯）—氨基喹啉与钯的显色反应及应用

Color Reaction of 5-(Phenylazo)-8-(4-nitro-1-phenyldiazo)-aminoquinoline with Palladium and Its Application

摘要: 在弱碱性介质中，乳化剂－ＯＰ存在下，５－（偶氮苯）－８－（４－硝基－１－重氮苯）－氨基喹啉（ＰＡＮＰＡＱ）与钯发生显色反应，生成ｎＰＡＮＰＡＱ∶ｎＰｄ（Ⅱ）＝２∶１的蓝色络合物，最大吸收峰位于６４０ｎｍ，摩尔吸光系数为１．０８×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，钯的质量浓度在０～６００μｇ／Ｌ符合比尔定律。所考查的５４种共存离子，对测定Ｐｄ（Ⅱ）基本无影响。方法已用于钯催化剂中Ｐｄ（Ⅱ）的测定，结果与原子吸收法相符，５次测定的ＲＳＤ在１．３％～１．５％。

Abstract: Color reaction of 5(phenylazo)8(4nitro1phenyldiazo)aminoquinoline (PANPAQ) with palladium() was studied. In a weak alkaline medium and in presence of OP, Pd() reacts with PANPAQ to form a blue stable complex with nPANPAQnPd()=21. The maximum absorption is