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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％。
The color reaction of 5- (azobenzene) -8- (4-nitro-1-diazobenzene) -quinoline (PANPAQ) with palladium in the presence of emulsifier- The blue complex of nPANPAQ: nPd (II) = 2: 1 was obtained. The maximum absorption peak was at 640 nm and the molar extinction coefficient was 1.08 × 10 5 L · mol -1 · cm -1. The mass concentration of palladium was 0-600 μg / L complies with Bill’s law. The 54 kinds of coexisting ions examined have no effect on the determination of Pd (Ⅱ). The method has been applied to the determination of Pd (Ⅱ) in palladium catalyst. The results are in good agreement with those of atomic absorption spectrometry. The RSD of five determinations is between 1.3% and 1.5%.