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Impurities content (weight %) | |
---|---|
Assay of sulfur dioxide (SO2) | >66% |
Chlorides (Cl-) | <0.005 |
Thiosulfates (S2O32-) | <0.02 |
Iron (Fe2+) | <0.0005 |
Cadmium (Cd2+) | <0.005 |
Mercury (Hg2+) | <0.00005 |
Arsenic (As3+) | <0.00005 |
Heavy metals (Pb2+) | <0.0001 |
pH of 5% water solution | 4,0 - 4,5 |