1 | Appearance | Pink solid | Pink or almost white solid. |
2 | Solubility | Passes | Freely soluble, practically insoluble in ethanol (96%) |
3 | Assay (Complexometric) | 99.53% | 98.0% - 102.0% (MnSO4.H2O) |
4 | Assay | 99.5% | 99.0% - 101.0% (Complexometric, calc. on the ignited basis) |
5 | Identification (Sulfate) | Passes | A white precipitate should form |
6 | Identification by Chemical test | Passes | A pale pink precipitate is formed which dissolves on the addition of 1 mL of anhydrous acetic acid |
7 | Appearance of solution | Passes | Solution S is not more opalescent than standard solution |
8 | Chloride (Cl) | Less than 0.005% | NMT 0.005% |
9 | Heavy metals (as Pb) | Less than 0.002% | NMT 0.002% |
10 | Arsenic (As) | Less than 0.0003% | NMT 0.0003% |
11 | Calcium (Ca) | Less than 0.01% | NMT 0.01% |
12 | Cobalt (Co) | Less than 0.0005% | NMT 0.0005% |
13 | Iron (Fe) | Less than 0.001% | NMT 0.001% |
14 | Nickel (Ni) | Less than 0.0015% | NMT 0.0015% |
15 | Lead (Pb) | Less than 0.0004% | NMT 0.0004% |
16 | Selenium (Se) | Less than 0.003% | NMT 0.003% |
17 | Zinc (Zn) | Less than 0.005% | NMT 0.005% |
18 | Substances not precipitated by ammonium sulfide (as SO4) | Less than 0.5% | NMT 0.5% |
19 | Loss on ignition, 500°C | 10.61% | NMT 10.5% - 12.0% |