Sulfadimidine(SM₂)
Veterinary medicine governor of the People's Republic of China
(2010)                                                                        BP2009                                                       EP6                     USP 31
Property: White or yellowish crystal or powder  White or yellowish crystal or powder    Same with BP    Same with BP    
Melting point: 197-200℃                                       197-200℃                                                  197-200℃         197-200℃
Identification: (1) (2) (3) shall comply with          ABCD shall comply with                          ABCD shall comply with      AB shall comply with
pH value : ≤0.1mol/L NaOH 0.2ml                     ≤0.1mol/L NaOH 0.2ml                             Same with BP                            
Chloride : ≤0.01%                                                   /                                                                       /                                             /
Related substances : ≤0.5% (TLC)                  ≤0.5% (TLC)                                                 ≤0.5% (TLC)                      /
Drying loss: ≤0.5%                                               ≤0.5%                                                            ≤0.5%                     ≤0.5%
Residue on ignition: ≤0.1%                                 ≤0.1%                                                           ≤0.1%                        /
Heavy metal: No more than ten over 10 PPM     ≤20PPM                                                       ≤20PPM                 ≤20PPM
Selenium:       /                                                            /                                                                   /                                ≤0.003%
Content (Anhydrous substance) : No less than 99.0%     99.0-101.0%                             99.0-101.0%           99.0-100.5%