| Analytical Items | Standard |
| Appearance | White crystals or crystalline powder |
| Assay | 98.0~101.0 % |
| pH value | 4.5~5.5 |
| Specific optical rotation[a] D 20° | +8.3 o ~ +9.5 o |
| State of solution (Transmittance) | ≥95.0 % |
| Loss on drying | ≤0.5 % |
| Residue on ignition | ≤0.1 % |
| Chloride (Cl ) | ≤0.04 % |
| Sulfate (SO 4 ) | ≤0.03 % |
| Ammonium (NH 4 ) | ≤0.02 % |
| Iron (Fe) | ≤0.001 % |
| Heavy metals ( Pb ) | ≤0.001 % |
| Arsenic | ≤0.0001 % |