### 用DHDECMP在逆流色谱上分离镧系金属离子

1. 浙江大学化学系.杭州(310027);西北核技术研究所.西安(710000)
• 发布日期:2000-06-15

### Separation of metal ions by countercurrent chromatography using dihexyl-N,N-diethylcarbamoyl methylene phosphonate

Jin Yuren;Zhang Lianzhong;Han Shijun;Zhang Lixing;Zhang Jiamei;Ma Feng

1. Zhejiang Univ, Dept Chem.Hangzhou(310027);NW Inst Nucl Technol, POB 69.Xian(710000)
• Published:2000-06-15

In the present work, the batch distribution ratios of 9 lanthanide ions, Ce^3^+, Nd^3^+, Sm^3^+, Gd^3^+, Tb^3^+, Dy^3^+, Er^3^+, Yb^3^+ and Lu^3^+, ae measured by countercurrent chromatography (CCC) with 25% DHDECMP (dihexyl-N,N-diethylcarbamoylmethylene phosphonate) in cyclohexane as the stationary phase and 3.35 mol/L HNO~3 as the mobile phase. Although perfect separation of the lanthanide ions using this system is impossible, heavy and light lanthanides can be grouped. The light lanthanides are better separated from each other. The interested metals can be nearly completely recovered. The dynamic distribution coefficients (D^d^y^n) obtained from the chromatogram are not equal to but proportional to the batch distribution coefficients (D^b^a^t), althongh the D^d^y^n is often equal to D^b^a^t in the separation of organic solute. This discrepancy is attributed to that the mechanism of the separation of metal ions by CCC is different from that of the organic solute. The results are consistent with the theoretical predictions, indicating that CCC deserves to be explored as a method for investigating the mechanism of the extraction reactions.