CAS NO.: 59-51-8
| Test Items | Limit |
| Identification | Conforms |
| Specific rotation | +23.0°~-+24.5° |
| State of solution | Clear and colorless |
| Chloride(CI) | ≤ 0.020% |
| Ammonium(NH4) | ≤ 0.02% |
| Sulfate(SO4) | ≤ 0.020% |
| Heavy metals(Pb) | ≤ 10PPm |
| Iron(Fe) | ≤ 10PPm |
| Arsenic(As2O3) | ≤ 1PPm |
| Residue on ignition (sulfated) | ≤ 0.1% |
| Loss on drying | ≤ 0.20% |
| Assay | 99.0~100.5% |
| PH | 5.6~6.1 |