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| Impurities content (weight %) | |
|---|---|
| Insoluble in water substances | <0.005 |
| Acidity (HC2O4-) | <0.025 |
| Alkalinity (HCO3-) | <0.025 |
| Total Nitrogen (N) | <0.002 |
| Sulfates (SO42-) | <0.01 |
| Phosphates (PO43-) | <0.002 |
| Chlorides (Cl-) | <0.001 |
| Iron (Fe2+) | <0.0005 |
| Sodium (Na+) | <0.02 |
| Heavy metals (Pb2+) | <0.0005 |



