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Impurities content (weight %) | |
---|---|
Insoluble in HCl substances | <0.1 |
Residue after calcination | <0.1 |
Nitrates (NO3-) | <0.04 |
Sulfates (SO42-) | <0.01 |
Chlorides (Cl-) | <0.01 |
Iron (Fe2+) | <0.05 |
Heavy metals (Pb2+) | <0.005 |