Specific rotation[α]20/D (C=5,1mol/L HCL) +10.5° to +12.3° Chloride (Cl) Not more than 0.10% Sulfate (SO4) Not more than 0.2% Heavy metal(Pb) Not more than 10ppm Arsenic(As2O3) Not more than 2ppm Loss on drying Not more than 0.20% Assay 98.0% to101.0%