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Appearance White crystals or crystalline powder Specific Rotation [25/D] -11.5°~ -13.0° State of solution Not less than 95.0% Chloride(Cl) Not more than 0.04% Ammonium(NH 4 ) Not more than 0.10% Sulfate (SO4) Not more than 0.048% Heavy Metal(Pb) Not more than 10ppm Iron(Fe) Not more than 30ppm Arsenic(As2O3 ) Not more than 2ppm Loss on drying Not more than 0.6% PH 1.7~2.8 Residue on ignition(sulfated) Not more than 0.2% Assay 98.0~101.0%