金属离子-苯芴酮-季铵盐的三元络合体系已用于锡、锗、钼、钨、钴、锆等的分光光度法测定。关于稀土元素与苯芴酮的显色反应尚未见过报导。继稀土-铬菁R-邻菲啰啉-长链季铵盐四元络合物显色反应的研究后,我们发现把该体系中的铬菁R换成苯芴酮,在PH 9.5～10和0.2～1.4M NH_4OH的介质中可以形成很深的紫蓝色络合物。我们系统地研究了稀土-苯芴酮-邻菲啰啉-长链季铵盐四元络合物的形成 Ternary complex system of metal ion-benzene fluorenone-quaternary ammonium salt has been used for the spectrophotometric determination of tin, germanium, molybdenum, tungsten, cobalt and zirconium. There have been no reports on the color reaction of rare earth elements with benzofluorenone. Following the study of the color reaction of the rare earth-chrysene R-phenanthroline-long chain quaternary ammonium salt quaternary complex, we found that the Chromocyanine R in this system was replaced by benzofluorenone at pH 9.5-10 And 0.2 ~ 1.4M NH 4 OH medium can form a deep purple blue complex. We systematically studied the formation of a rare earth-phenyl fluorenone-phenanthroline-long chain quaternary ammonium salt quaternary complex