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| Impurities content (weight %) | |
|---|---|
| Insoluble in water substances | <0.003 |
| Substances reducing of KMnO4 | <0.0005 |
| Chlorides (Cl-) | <0.001 |
| Iron (Fe2+) | <0.0005 |
| Sodium + Calcium (Na+ + Ca2+) | <0.1 |
| Zinc (Zn2+) | <0.005 |
| Heavy metals (Pb2+) | <0.0002 |




