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研究了不同浓碱皂化的Ｄ２ＥＨＰＡ－正庚烷体系萃取一系列稀土离子（Ｌａ￣（３＋）→Ｌｕ￣（３＋），放射性的Ｐｍ 除外）过程中有机相的ＦＴＩＲ光谱变化规律．结果表明：Ｄ２ＥＨＰＡ萃取稀土离子后，Ｐ＝Ｏ基团的红外吸收频率降低，吸收强度升高，说明Ｐ＝Ｏ基团与稀土离子发生配位；红外光谱研究结果还表明：不同稀土离子与Ｐ＝Ｏ配位能力有差别，从Ｌａ￣（３＋）→Ｓｍ￣（３＋）配位能力依次增大，从Ｓｍ￣（３＋）→Ｌｕ￣（３＋）则呈下降趋势，对同一个稀土离子来说，随着有机相中稀土离子含量的增加，有机相微乳液中Ｈ＿２Ｏ的含量减小，萃取过程伴随有破乳发生．
The variation of FTIR spectra of organic phase during the extraction of a series of rare earth ions (La¯ (3+) → Lu¯ (3+), radioactive Pm) with different concentrated alkali saponified D2EHPA-n-heptane systems was studied. The results showed that the infrared absorption frequency of P = O group decreased after D2EHPA extraction of rare earth ions, and the absorption intensity increased, indicating that the coordination of P = O group with rare earth ions. The results of IR spectroscopy also showed that different rare earth ions and P = O, the coordination ability increases from La¯ (3+) → Sm¯ (3+), and then decreases from Sm¯ (3+) → Lu¯ (3+) to the same rare earth ions Said that with the increase of rare earth ions in the organic phase, the content of H_2O in the organic microemulsion decreases and the extraction process is accompanied by the demulsification.