在分离稀土元素的薄层层析法中,展开剂的选择为主要研究课题。1964年,Pierce等用 P204进行稀土元素的薄层层析分离,可分离3—4个稀土元素。1976年以来,德国Specker等人用乙醚-四氢呋喃-?204-硝酸(100:15:1:3.5)在硅烷化的硅胶板上实现 In the thin layer chromatography method of separating rare earth elements, the choice of developing agent is the main research topic. In 1964, Pierce et al. Used P204 for thin layer chromatography of rare earth elements to separate 3-4 rare earth elements. Since 1976, German Specker et al. Have been realized on silanated silica gel plates with ether-tetrahydrofuran-204-nitric acid (100: 15: 1: 3.5)