| ITEMS | STANDARD |
| Appearance | White crystalline powder |
| Assay | 98.0~102.0% |
| Specific rotation | +5.6°~+8.9° |
| Loss on drying | =<1.0 % |
| Transmittance | >=98.0% |
| Sulfate (as SO4) | =<0.02 % |
| Ammonium as (as NH4) | =<0.02% |
| Iron (as Fe) | =<0.001% |
| Heavy Metals (as Pb) | =<0.001% |
| Arsenic (as As) | =<0.0001% |
| pH Value | 0.5~2.0 |
| Residue on ignition | =<0.1% |