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| Impurities content (weight %) | |
|---|---|
| Insoluble in water substances | <0.01 |
| Total nitrogen (N) | <0.005 |
| Sulfates (SO42-) | <0.003 |
| Iron (Fe2+) | <0.002 |
| Sodium + Potassium + Calcium (Na+ + K+ + Ca2+) | <0.03 |
| Arsenic (As3+) | <0.00005 |
| Nickel (Ni2+) | <0.002 |
| Lead (Pb2+) | <0.002 |
| pH of 5% water solution | 3,0 - 4,0 |




