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Impurities content (weight %) | |
---|---|
Insoluble substances in methanol | <0.04 |
Insoluble substances in KBr solution | <0.04 |
Residue after calcination | <0.02 |
Residue not reduced by formic acid | <0.02 |
Sulfates (SO42-) | <0.02 |
Chlorides (Cl-) | <0.2 |
Iron (Fe2+) | <0.001 |
Arsenic (As3+) | <0.0002 |