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| Quality Indicators |
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| Item of Analysis | Item of Analysis |
| Free Chlorine | ≤0.0001 |
| Sulphate | ≤0.0002 |
| Sulfite | ≤0.0002 |
| Arsenic | ≤0.000005 |
| Lead | ≤0.00002 |
| Residue on ignition(as SO4) | ≤0.0005 |
| Assay | 36.0～38.0 |
| Tin | ≤0.0002 |
| Iron | ≤0.00005 |
| Copper | ≤0.00001 |
| Color，Hazen units | ≤10 |
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