| H+ (mol∙L−1) | Separation factor(SF) Zr/Hf | ||
| DEHPA | IONQUEST®801 | CYANEX®272 | |
| 1.0 | 1.2 | 1.1 | 22.9 |
| 2.0 | 1.3 | 1.1 | 22.1 |
| 3.0 | 1.2 | 1.2 | 23.3 |
| 4.0 | 1.6 | 1.2 | 31.0 |
| 5.0 | 1.2 | 1.2 | 22.0 |