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| Quality Indicators |
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| Item of Analysis | Item of Analysis |
| Chloride | ≤0.00002 |
| Nitrate | ≤0.00002 |
| Arsenic | ≤0.000001 |
| Assay | 95.0～98.0 |
| Lead | ≤0.00001 |
| Residue on ignition(as SO4) | ≤0.0005 |
| Permanganate reducing substances(as SO2) | ≤0.0002 |
| Iron | ≤0.00002 |
| Ammonium | ≤0.0001 |
| Copper | ≤0.00001 |
| Color，Hazen units | ≤10 |
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