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合成了新试剂５－（３－羧基苯偶氮）－８－氨基喹啉（ｍ－ＣＰＡＱ）。在弱碱性介质中，Ｔｗｅｅｎ－８０和ＴｒｉｔｏｎＸ－１００存在下，ｍ－ＣＰＡＱ与Ｐｄ（Ⅱ）生成紫蓝色三元络合物，λｍａｘ＝６１５ｎｍ，ε１＝８４×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，Ｐｄ在０～３０μｇ／２５ｍｌ符合比尔定律。用于岩矿中微量Ｐｄ的测定，结果满意。
A new reagent 5- (3-carboxyphenylazo) -8-aminoquinoline (m-CPAQ) was synthesized. In mild alkaline medium, m-CPAQ and Pd (Ⅱ) generated purple-blue ternary complex in the presence of Tween-80 and TritonX-100 with λmax = 615nm and ε1 = 8.4 × 104L · mol-1 · Cm-1, Pd in 0 ~ 30μg / 25ml Beer’s law. For the determination of trace Pd in rock and mine, the results are satisfactory.