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Impurities content (weight %) | |
---|---|
Insoluble in water substances | <0.02 |
Total nitrogen (N) | <0.01 |
Sulfates (SO42-) | <0.01 |
Iron (Fe2+) | <0.005 |
Sodium + Potassium + Calcium (Na+ + K+ + Ca2+) | <0.1 |
Arsenic (As3+) | <0.0002 |
pH of 5% water solution | 3,0 - 4,0 |