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Impurities content (weight %) | |
---|---|
Insoluble in water substances | <0.01 |
Residue after calcination | <0.2 |
Selenites (SeO32-) | <0.2 |
Chlorides (Cl-) | <0.001 |
Iron (Fe2+) | <0.001 |
Heavy metals (Pb2+) | <0.0001 |