| ITEM | STANDARD |
| Appearance | White powder |
| Assay (on dried basis) | 99.0-100.5% |
| pH (10% Solution) | 6.0- 9.0 |
| Loss on drying (155℃, 4h) | =< 2.0% |
| Water insoluble matter | =< 1% |
| Chlorides (Cl) | =< 0.1% |
| Arsenic (As) | =< 3 mg/kg |
| Lead (Pb) | =< 5 mg/kg |
| Heavy metals | =< 10 mg/kg |
| Sulfate (SO4) | =< 0.1% |
| Nitrate (NO3) | Pass test |
| Organic volatile impurities | Pass test |
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