| Results | Limits | |
| Assay: | 99.0% | 97.0-103.0% |
| Insoluble Matter: | 0.0005% | 0.005% max. |
| Residue after Ignition: | 0.0005% | 0.005% max. |
| Chloride: | 0.0001% | 0.0005% max. |
| Sulfate: | 0.0005% | 0.005% max. |
| Heavy Metals: | <0.0001% | 0.001% max. |
| Iron: | <0.0001% | 0.001% max. |
| pH(5% soln. at 25°C): | 6.6 | 6.5-7.0 |