| Item | Standard |
| Appearance | White or almost white, crystalline powder or colourless crystals |
| Melting point | About 190ºC. with decomposition |
| Infrared absorption spectrum | Infrared absorption spectrum accord with the referance spectrum of ascorbic acid CRS |
| PH(With 5% water solution) | 2.1-2.6 |
| PH(With 2% water solution) | 2.4-2.8 |
| Appearance of solution | Clarity; clear; colour: ≤BY7 |
| Specific optical rotation | 20.5ºC- 21.5ºC |
| Loss on drying | ≤0.4% |
| Impurity E | ≤0.2% |
| Related substance | Impurity C: ≤0.15% |
| Impurity D: ≤0.15% |
| Unpecified impurities:≤0.10% |
| Total impurities:≤0.20% |
| Copper | ≤5.0ppm |
| Iron | ≤2.0ppm |
| Arisenic | ≤3.0ppm |
| Lead | ≤2.0ppm |
| Mercury | ≤1.0ppm |
| Cadmium | ≤1.0ppm |
| Heavy metals | ≤10ppm |
| Sulphated ash | ≤0.1% |
| Assay | 99.0% ~ 100.5% |
Complaint
