Item Standard Appearance White powder Specific rotation[α]20/D (C=10 in 2N HCl) -31.0 to -32.2 Degree 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 0.20% Assay 98.0 to101.0%