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Impurities content (weight %) | |
---|---|
Residue after calcination | <0.01 |
Insoluble in water substances | <0.005 |
Total nitrogen (N) | <0.001 |
Sulfates (SO42-) | <0.002 |
Chlorides (Cl-) | <0.0005 |
Iron (Fe2+) | <0.0002 |
Calcium (Ca2+) | <0.002 |
Magnesium (Mg2+) | <0.0015 |
Heavy metals (Pb2+) | <0.0005 |