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| Impurities content (weight %) | |
|---|---|
| Aluminum (Al3+) | <0.01 |
| Ammonium salts (NH4+) | <0.1 |
| Bismuth (Bi3+) | <0.0003 |
| Iron (Fe2+) | <0.001 |
| Silicon (SiF62-) | <0.02 |
| Magnesium (Mg2+) | <0.001 |
| Copper (Cu2+) | <0.0005 |
| Lead (Pb2+) | <0.0002 |
| Sulfates (SO42-) | <0.02 |
| Antimony (Sb3+) | <0.001 |
| Thallium (Tl+) | <0.005 |
| Chlorides (Cl-) | <0.005 |





