Assay | 98.5% min |
Appearance | White crystalline powder |
Identification | Meets the requirement |
Loss on drying | 1.0% max |
Heavy metals | 0.002% max |
Lead | 0.001% max |
Chloride | 0.07% max |
Sulphate | 0.05% max |
Arsenic | 3ppm max |
Reducing substances | 0.5% max |
Iron | 40ppm max |
pH | 6.5-8.5 |