作者在研究偶氮氯膦Ⅲ与铅的显色反应过程中,发现当有邻菲啰啉和铜共存时,灵敏度将成倍增加。并形成了相应的四元络合物。偶氮氯膦Ⅲ作为稀土元素的显色剂已为人们所知。本文利用上述原理,对稀土元素进行了研究,试验表明,CPAⅢ-Cu-Phen-RE,在一定条件下也能形成多元络合物,但它在水中的稳定性较差(发生混浊),如有 In the study of the color reaction of chlorophosphonazo III with lead, it was found that the sensitivity increased exponentially when phenanthroline and copper coexisted. And formed the corresponding quaternary complex. Chlorophosphonazo III as a developer of rare earth elements has been known. In this paper, the above principles were used to study rare earth elements. The experimental results show that CPAⅢ-Cu-Phen-RE can form multi-complex under certain conditions, but its stability in water is poor (turbidity) Have