CAS No.: 59-51-8 Other Names: DL-Methionine MF: C5H11NO2S EINECS No.: 200-432-1 Specifications: (Reference Standard AJI92) Item Standard Analysis data Appearance White crystals or crystalline powder Conforms State of solution (Transmittance) Clear and colorless not less than 98.0% 98.0% Chloride (Cl) Not more than 0.020% <0.02% Ammonium (NH4) Not more than 0.02% <0.02% Sulfate (SO4) Not more than 0.020% <0.02% Iron (Fe) Not more than 10ppm 7ppm Heavy metal(Pb) Not more than 10ppm <10ppm Arsenic(As2O3) Not more than 1ppm <1ppm Other Amino Acids Chromatographically Not detectable Conforms Loss on drying Not more than 0.30% 0.2% Residue on ignition(sulfated) Not more than 0.10% 0.08% Assay 99.0% to 100.5% 99.0% pH 5.6 to 6.1 5.8