Purity, %   98.0Min  
Loss on drying, % 0.35Max  
Reducing substances, % 0.70Max  
Heavy metal(Pb), ¦Ìg/g 10 Max  
Sulfate, % 0.05Max  
Chloride, % 0.07Max  
Lead, ¦Ìg/g 2Max  
Arsenic, ¦Ìg/g 2Max  
PH 6.2-7.8