| H+ (mol∙L−1) | Separation factor (SF) Zr/Hf | ||
| DEHPA | IONQUEST®801 | CYANEX®272 | |
| 1.0 | 1.0 | 1.4 | 22.9 |
| 2.0 | 1.1 | 1.2 | 26.4 |
| 3.0 | 1.1 | 1.6 | 23.6 |
| 4.0 | 1.3 | 1.9 | 25.3 |
| 5.0 | 1.3 | 1.5 | 25.1 |