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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 |





