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| Impurities content (weight %) | |
|---|---|
| Insoluble in water substances | <0.002 |
| Residue after calcination | <0.005 |
| Nitrates and other oxidizing agents (NO3-) | <0.0005 |
| Sulfates (SO42-) | <0.002 |
| Phosphates (PO43-) | <0.0003 |
| Thiocyanates (SCN-) | <0.001 |
| Iron (Fe2+) | <0.0002 |
| Calcium (Ca2+) | <0.001 |
| Magnesium (Mg2+) | <0.001 |
| Arsenic (As3+) | <0.00001 |
| Heavy metals (Pb2+) | <0.0002 |
| pH of 5% water solution | 4,5 - 5,5 |



