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Impurities content (weight %) | |
---|---|
Insoluble in HCl substances | <0.02 |
Soluble carbonates and alkalis | <0.015 |
Total nitrogen (N) | <0.002 |
Sulfides (S2-) | <0.0005 |
Chlorides (Cl-) | <0.002 |
Potassium + Sodium (K+ + Na+) | <0.1 |
Calcium + Strontium (Ca2+ +Sr2+) | <0.5 |
Heavy metals (Pb2+) | <0.001 |