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Item Standard Appearance White crystals Specific rotation[α]D/20 (C=2 in H2O) +10.8°to +12.3° Melting Point (oC) 159 to 161 oC Chloride(C1) Not more than 0.02% Sulfate(SO4) Not more than 0.02% Iron(Fe) Not more than 30ppm Heavy metals(Pb) Not more than 10ppm Arsenic(As2O3) Not more than 1ppm Loss on drying Not more than 0.50% Residue on ignition Not more than 0.10% Assay 98.0%～101.0%