| Result | Limits | |
| Assay (CoSO4 · 7H2O): | 99.7% | 97.0% min. |
| pH of 5% soln. at 25°C: | 4.93 | 3.0-7.0 |
| Insoluble matter: | 0.001% | 0.01% max. |
| Chloride: | < 0.001% | 0.001% max. |
| Nitrate: | < 0.001% | 0.005% max. |
| Copper: | < 0.0001% | 0.002% max. |
| Iron: | 0.002% | 0.005% max. |
| Lead: | < 0.0001% | 0.002% max. |
| Nickel: | 0.02% | 0.1% max. |
| Zinc: | 0.002% | 0.02% max. |