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Impurities content (weight %) | |
---|---|
Insoluble in water substances | <0.002 |
Residue after calcination | <0.01 |
Free hydrochloric acid (HCl) | <0.15 |
Sulfates (SO42-) | <0.001 |
Iron (Fe2+) | <0.0003 |
Arsenic (As3+) | <0.0001 |
Heavy metals (Pb2+) | <0.0005 |
Ammonium chloride (NH4Cl) | <0.3 |