| ITEM | STANDARD |
| Appearance | White crystalline powder |
| Identification | Pass test |
| Assay (C10H14N2Na2O8.2H2O) | 99.0% ~ 101.0% |
| Chloride (Cl) | =< 0.01% |
| Sulphate (SO4) | =< 0.1% |
| pH (1%) | 4.0- 5.0 |
| Ferrum (Fe) | =< 10 mg/kg |
| Lead (Pb) | =< 5 ppm |
| Heavy metals (as Pb) | =< 10 ppm |