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Impurities content (weight %) | |
---|---|
Insoluble in HNO3 substances | <0.05 |
Residue after calcination | <0.02 |
Sulfates (SO42-) | <0.002 |
Chlorides (Cl-) | <0.002 |
Iron (Fe2+) | <0.0005 |
Mercury(II) salts (Hg2+) | <0.5 |
Heavy metals (Pb2+) | <0.001 |