| ITEM | STANDARD |
| Apperance | Almost White Crystalline powder |
| Assay % | >=99 |
| Melting point | 152-156 ℃ |
| Loss on drying % | ≤1 |
| Ignition residue | ≤0.1 |
| Chloride(ppm) | ≤100 |
| Heavy metal(ppm) | ≤3 |
| Arsenic (ppm) | ≤1 |
| Ferrum (ppm) | ≤10 |
| Microbiological test | Bacteria: ≤3000CFU/gFungus: ≤100CFU/g |