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Impurities content (weight %) | |
---|---|
Residue after calcination | <0.002 |
Sulfates (SO42-) | <0.001 |
Chlorides (Cl-) | <0.0003 |
Nitrates (NO3-) | <0.001 |
Phosphates (PO43-) | <0.0005 |
Iron (Fe2+) | <0.0002 |
Calcium (Ca2+) | <0.003 |
Heavy metals (Pb2+) | <0.0005 |