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| Impurities content (weight %) | |
|---|---|
| Insoluble substances in diluted CH3COOH | <0.005 | 
| Residue after calcination | <0.02 | 
| Sulfates (SO42-) | <0.05 | 
| Chlorides (Cl-) | <0.015 | 
| Iron (Fe2+) | <0.001 | 
| Arsenic (As3+) | <0.0001 | 

 
      
 
      
 
      





