| H+ (mol∙L−1) | Separation factor (FS) Zr/Hf | |
| Liquor zircon | Liquor prepared from hydroxides | |
| 1.0 | 1.1 | 0.7 |
| 2.0 | 3.5 | 1.6 |
| 4.0 | 13.7 | 4.7 |
| 5.0 | 11.4 | 13.1 |
| 6.0 | 13.7 | 13.7 |
| 7.0 | 79.3 | 51.3 |