Tests | Specifications | Results |
Appearance | Colorless hygroscopic crystals with faint odor | Colorless hygroscopic crystals with faint odor |
Assay | Min 98% | 98.27% |
Insoluble matter (10% in water) | Max 0.005% | < 0.005% |
pH (5% solution; 25°C) | pH 6.7-7.3 | 6.78 |
Phosphate (PO4) | Max 0.0005% | 0.00045% |
Chloride (Cl) | Max 0.0005% | 0.00049% |
Nitrate (NO3) | Max 0.001% | 0.00099% |
Sulphate (SO4) | Max 0.001% | 0.00079% |
Iron (Fe) | Max 0.0005% | 0.000045% |
Heavy metal (as Pb) | Max 0.0005% | 0.00012% |
Residue on ignition (as ash) | Max 0.01% | 0.010% |
Reducing substances by KMnO4 (as O) | Max 0.005% | < 0.005% |
Water (H2O) | Max 2.0% | 1.19% |