Item | Specification |
Appearance | White crystalline powder |
Assay | ≥99.5% |
Melting point | 201 to 207±1℃ |
Clarity of water solution | Transparency, colorless, none suspended matters. |
PH | 5.0~7.0 |
Specific optical rotation | [α]D20=+175-185° |
Arsenic | ≤2ppm |
Hydroquinone | ≤10ppm |
Heavy metal | ≤10ppm |
Loss on drying | ≤0.5% |
Ignition residue | ≤0.5% |
Phathogen | Bacteria ≤1000cfu/g |
Fungus ≤100cfu/g |