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用二烷基一硫代膦酸（Ｃｙａｎｅｘ３０２）和二烷基二硫代膦酸（Ｃｙａｎｅｘ３０１）作萃取剂，环己烷作稀释剂，研究了它们对示踪量镅和铕的萃取行为及在常量镧存在时，Ｃｙａｎｅｘ３０１对镅、镧、铕和铥的萃取。结果表明，Ｃｙａｎｅｘ３０１和Ｃｙａｎｅｘ３０２萃取示踪量镅和铕时，镅与铕的萃取行为极其相似，但有常量稀土存在时，Ｃｙａｎｅｘ３０１对镅有明显的选择性，镅与铕的分离因数接近２００；稀土元素的萃取顺序为：ＤＴｍ＞ＤＥｕ＞ＤＬａ。
Using cyclohexane as a diluent, dialkyl monothiophosphonic acid (Cyanex302) and dialkyldithiophosphonic acid (Cyanex301) were used as extraction solvents to study the extraction behavior of trace amounts of europium Extraction of Cyanex301 for 镅, lanthanum, europium and 铥 in the presence of a constant amount of lanthanum. The results showed that when Cyanex301 and Cyanex302 were used to extract trace amounts of 镅 and europium, the extraction behavior of 镅 and europium was very similar. However, Cyanex301 had obvious selectivity to 存 in the presence of rare earths, and the separation factor between 镅 and europium was close to 200. Elements are extracted in order: DTm> DEu> DLa.