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Appearance White crystals or crystalline powder Specific rotation[α]20/D -11.8 to -12.8° State of solution (Transmittance) Not less than 95.0% Chloride (Cl) Not more than 0.10% Heavy metal(Pb) Not more than 10ppm Arsenic(As2O3) Not more than 2ppm Loss on drying Not more than 0.20% Residue on ignition(sulfated) Not more than 0.2% Assay 98.0 to101.0%