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％。
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 at 640 nm with molar absorptivity of 1.08105 Lmol-1cm-1. Beers law is obeyed in the range of 0600 g/L for Pd(). The interferences from 54 coexistent ions on the determination of Pd() were studied and no serious interference was found. The method has been applied to the determination of Pd in palladium catalysts. The results are in agreement with those provided by AAS with precision of 1.3% to 1.5% RSD(n=5).\=\=
出处
《岩矿测试》
CAS
CSCD
北大核心
1999年第2期117-119,共3页
Rock and Mineral Analysis
关键词
偶氮苯
硝基
重氮基
氨基喹啉
比色法
phenylazo)8(4nitro1phenyldiazo)aminoquinoline
palladium
spectrophotometric determination
