| Items | Specifications |
| Appearance | White crystals or crystalline powder |
| Assay, % (on dry matter) | 98.5~101.5 |
| Specific rotation | +21.9°~+24.1° |
| pH value | 5.6~6.1 |
| Loss on drying, % | ≤0.3 |
| Heavy metals, % | ≤0.0015 |
| Residue on ignition, % | ≤0.4 |
| Chloride,% | ≤0.05 |
| Sulfate,% | ≤0.03 |
| Arsenic, % | ≤0.00015 |
| Iron, % | ≤0.003 |
