| Solvent conc., M | Extraction Efficiency, % | ||
| Cu | Co | Ni | |
| 0.1 | 77.2 | 84.4 | 85.2 |
| 0.3 | 82.2 | 88.5 | 90.2 |
| 0.5 | 88.5 | 96.0 | 94.0 |
| 1 | 96.8 | 97.0 | 97.4 |