| ITEM | STANDARD |
| Appearance | Colorless crystals, slight acetic acid odor |
| Assay (dry basis, %) | 99.0-101.0 |
| pH (5% Solution, 25℃) | 7.5- 9.0 |
| Loss on Drying (120℃, 4h, %) | 36.0 – 41.0 |
| Insoluble Matter (%) | =< 0.05 |
| Chlorides (Cl, %) | =< 0.035 |
| Alkalinity (as Na2CO3, %) | =< 0.05 |
| Phosphate (PO4) | =< 10 mg/kg |
| Sulphate (SO4) | =< 50 mg/kg |
| Iron (Fe) | =< 10 mg/kg |
| Arsenic (As) | =< 3 mg/kg |
| Lead (Pb) | =< 5 mg/kg |
| Mercury (Hg) | =< 1 mg/kg |
| Heavy Metal (as Pb) | =< 10 mg/kg |