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Impurities content (weight %) | |
---|---|
Residue after calcination in the form of sulfates | <0.2 |
Sulfates (SO42-) | <0.05 |
Chlorides (Cl-) | <0.02 |
Water (H2O) | <16 |
Arsenic (As3+) | <0.00007 |
Heavy metals (Pb2+) | <0.0005 |