| appearance | White or cream colored acicular crytal |
| Clarity of solution | Colorless and transparent |
| Pathogens | None <undetacted) |
| Melting point | 153-156`C |
| ssay | 99.0% min |
| Loss an drying | 0.5% max |
| Residue on ignition | O.1% max |
| Iron | 10ppm max |
| Heavy metals(as Pb) | 3ppm max |
| Arsenic | 1ppm max |
| Chloride | 50ppm max |