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| Impurities content (weight %) | |
|---|---|
| Insoluble in HNO3 substances | <0.002 | 
| Iron (Fe2+) | <0.001 | 
| Calcium (Ca2+) | <0.0005 | 
| Magnesium (Mg2+) | <0.0005 | 
| Copper (Cu2+) | <0.0005 | 
| Sodium (Na+) | <0.0005 | 
| Lead (Pb2+) | <0.005 | 
| Sulfates (SO42-) | <0.01 | 
| Chlorides (Cl-) | <0.001 | 

 
      
 
      


