稀土元素由于性质相近,用分光光度法测定各种稀土元素的含量确实不易。近年应用三元络合物来解决这个难题,加大了轻重稀土间的差别,使得分别测定轻重稀土元素有所可能。从文献可知,混合配位络合物体系一般均有高度的选择性,但灵敏度欠缺;而含有阳离子表面活性剂的三元络合物则反之,一般是灵敏度很高,选择性却较差。本文研究目的是借混合配位络合物与阳离子表面活性剂反应,形成四元络合物,使该体系同时具有 Due to the similar properties of rare earth elements, spectrophotometric determination of various rare earth elements is indeed not easy. In recent years, the application of ternary complexes to solve this problem, increase the difference between light and heavy rare earth, making the determination of light and heavy rare earth elements are possible. From the literature, mixed coordination complex systems are generally highly selective, but lacking in sensitivity, while ternary complexes containing cationic surfactants are, on the contrary, generally highly sensitive and less selective. The purpose of this study is to mix the coordination complex with the cationic surfactant to form a quaternary complex, so that the system has both