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Impurities content (weight %) | |
---|---|
Insoluble in water substances | <0.003 |
Ammonium sulfate (NH4)2SO4 | <0.3 |
Chlorides (Cl-) | <0.002 |
Iron (Fe2+) | <0.001 |
Arsenic (As3+) | <0.00005 |
Heavy metals (Pb2+) | <0.0005 |
Residue after calcination | <0.03 |