| Oxidant | Contact | Initial EMF (mV) | Final EMF (mV) | Extraction (%) | |||
| La | Ce | Pr | Nd | ||||
| None | 1st | 1460 | 950 | <1 | 45 | <1 | <1 |
| 2nd | 950 | 950 | <1 | 15 | <1 | <1 | |
| K2S2O8 | 1st | 1460 | 1175 | <1 | 45 | <1 | <1 |
| 2nd | 1250 | 1230 | <1 | 16 | <1 | <1 | |
| AgNO3 | 1st | 1460 | 925 | <1 | 44 | <1 | <1 |
| 2nd | 1220 | 1200 | <1 | 19 | <1 | <1 | |
| K2S2O8 +AgNO3 | 1st | 1620 | 1410 | <1 | 95 | <1 | <1 |
| 2nd | 1410 | 950 | <1 | 5 | <1 | <1 | |