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| Impurities content (weight %) | |
|---|---|
| Insoluble in water substances | <0.005 | 
| Sulfides (S2-) | <0.002 | 
| Sulfates (SO42-) | <0.005 | 
| Chlorides (Cl-) | <0.002 | 
| Ammonium salts (NH4+) | <0.001 | 
| Iron (Fe2+) | <0.0001 | 
| Heavy metals (Pb2+) | <0.0002 | 

 
      
 
      


