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| Impurities content (weight %) | |
|---|---|
| Insoluble in water substances | <0.1 |
| Residue after calcination | <0.05 |
| Iron (Fe2+) | <0.0005 |
| Heavy metals (Pb2+) | <0.001 |
| Optical density of 2% aqueous solution | <0.15 |
| Melting point (in the range of 1°C) | 111-115°C |



