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Appearance Off-White powder Specific rotation[α]20/D +25.0 to +27.0 Degree Chloride (Cl) Not more than 0.10% Ammonium (NH4) Not more than 0.10% Heavy metal(Pb) Not more than 20ppm Arsenic(As2O3) Not more than 1ppm Loss on drying Not more than 5.0% Residue on ignition(sulfated) Not more than 0.20% Assay 98.5% to 101.0%