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| Impurities content (weight %) | |
|---|---|
| Insoluble in water substances | <0,002 | 
| Sulfates (SO42-) | <0.001 | 
| Chlorides (Cl-) | <0.0001 | 
| Bismuth (Bi3+) | <0.0003 | 
| Iron (Fe2+) | <0.0001 | 
| Copper (Cu2+) | <0.0003 | 
| Mercury (Hg2+) | <0.00005 | 
| Lead (Pb2+) | <0.0005 | 
| Zinc (Zn2+) | <0.0005 | 

 
      


