| Items | Specification(AJI92) |
| Appearance | White crystals or crystalline powder |
| Assay(%) | 99.0%~101.0% |
| Heavy metal(Pb%) | ≤0.002 |
| Transmittance(%) | ≥98.0 |
| PH | 5.6~6.1 |
| Loss on drying(%) | ≤0.3 |
| Residue on ignition(%) | ≤0.1 |