| Item | Specification | Result |
|---|---|---|
| Appearance | White or light grey crystal or crystalline powder | Light grey crystal |
| Assay of DL-Methionine(%) | ≥99.0 | 99 |
| Specific Optical Rotation | +22.4″-F16+24.8″ | +23.7″ |
| PH Value | 5.6-6.1 | 6 |
| Residue On Ignition(%) | ≤0.4 | 0.03 |
| Loss On Drying(%) | ≤0.3 | 0.1 |
| Chloride(NaCL)(%) | 〈0.2 | 〈0.2 |
| Pb (mg/kg) | 〈20 | 〈20 |
| AS(mg/kg) | 〈2 | 〈2 |
| FE(mg/kg) | ≤30ppm | 7ppm |