Abstract
Extraction coefficients and separation factors of all lanthanides were determined in the system: dibutylphosphoric acid /HDBP/ - 3M NH4NCS, in the temperature range of 15–50 °C. The values for the separation factors for such pairs as: Gd−Tb and Er−Tm, are higher than 4, those for the pair of Tb−Dy are higher than 3, and those for the La−Ce, Pm−Sm, Dy−Ho, Ho−Er and Tm−Yb pairs are higher than 2. The influence of temperature on the separation factors of light /La−Gd/ and heavy /Gd−Lu/ lanthanides is discussed and compared with that observed for the extraction from the nitric acid solutions. The results are also discussed in the light of the double-double effect and outer-, vs. inner-sphere complexation in the lanthanide series.
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