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| Impurities content (weight %) | |
|---|---|
| Insoluble in water substances | <0.01 |
| Free iodine + iodates (I2 + IO3-) | <0.03 |
| Chlorides + bromides (Cl- + Br-) | <0.01 |
| Iron (Fe2+) | <0.005 |
| Heavy metals (Pb2+) | <0.001 |
| Potassium + Sodium (K+ + Na+) | <0.05 |



