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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 |



