| ITEM | STANDARD |
| Appearance | White Crystalline Powder |
| Assay (on dry matter) % | 98.5-101.5 |
| Clarity of Solution | Clear, colorless |
| Transmittance >=% | 98.0 |
| PH Value(1g/100ml in water) | 5.4-6.1 |
| Chloride(As Cl) =< % | 0.05 |
| Heavy Metals(As Pb) =< % | 0.002 |
| Lead (As Pb) =< % | 0.001 |
| Arsenic (As AS) =< % | 0.00015 |
| Sulfate(SO4) =< % | 0.02 |
| Ammonium( As NH4) =< % | 0.01 |
| Loss on drying =< % | 0.5 |
| Residue on ignition(as sulphate ash) =< % | 0.1 |
| Organic Volatile Impurities | Meets the requirement |
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