| Extractant | Initial pH | Final pH | Extraction (%) | Separation factor | |||||
| La | Ce | Pr | Nd | Ce/La | Ce/Pr | Nd/Pr | |||
| P507 | 1.0 | 1.0 | 7 | 76 | 35 | 36 | 44 | 5.8 | 1.0 |
| P507 | 2.0 | 2.0 | 26 | 89 | 80 | 80 | 24 | 2.2 | 1.0 |
| D2EHPA | 0.5 | 0.5 | 25 | 88 | 69 | 69 | 22 | 3.4 | 1.0 |
| D2EHPA | 1.0 | 1.0 | 54 | 93 | 88 | 89 | 16 | 2.6 | 1.0 |
| D2EHPA | 1.5 | 1.5 | 86 | 99 | 98 | 98 | 20 | 2.2 | 1.0 |