Appearance | White to off-white crystalline powder |
Assay (purity) | ≥ 98% |
Melting Point | 105-110°C |
Solubility | Soluble in water, slightly soluble in alcohol |
pH (1% solution) | 3.0 – 5.0 |
Odor | Characteristic sulfur-like odor |
Loss on Drying | ≤ 1% |
Heavy Metals (as Pb) | ≤ 10 ppm |
Arsenic | ≤ 2 ppm |
Chloride (Cl) | ≤ 0.5% |
Sulphate (SO4) | ≤ 0.05% |
Identity (by IR) | Matches the reference standard |