ITEM | UNIT | STANDARD (BP/USP) |
Appearance | White or almost white crystals or crystalline powder | |
Assay(C6H8O6) | % | 99.0-105.5 |
PH( with 2% water solution ) | 2.4-2.8 | |
PH( with 5% water solution ) | 2.1-2.6 | |
Melting point | 190-192℃ | |
Heavy metal | ≤10.0mg/kg | |
Iron | ≤2.0mg/kg | |
Copper | ≤5.0mg/kg | |
Lead | ≤2.5mg/kg | |
Arsenic | ≤2.0mg/kg | |
Mercury | ≤1.0mg/kg |