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| Impurities content (weight %) | |
|---|---|
| Residue after calcination | <0.02 |
| Insoluble in water substances | <0.002 |
| Total nitrogen (N) | <0.001 |
| Sulfates (SO42-) | <0.001 |
| Chlorides (Cl-) | <0.0005 |
| Iron (Fe2+) | <0.0002 |
| Calcium (Ca2+) | <0.0005 |
| Lead (Pb2+) | <0.00001 |
| Magnesium (Mg2+) | <0.0015 |
| Heavy metals (Pb2+) | <0.0002 |




