| Concomitant ions | Permissible amount of concomitant ions, mg | Concomitant ions | Permissible amount of concomitant ions, mg |
| Na(I) | 200 | Fe(III) | 15 |
| K(I) | 200 | V(V) | 10 |
| Mg(II) | 100 | W(VI) | 15 |
| Ca(II) | 50 | Cl− | 4 |