The CRM of chloramphenicol,thiamphenicol,florfenicol and florfenicolamine in chicken powder developed in this paper taken positive chicken breast meat as raw materials.After washing and removing impurities,the chicken breast meat is pulverized and homogenized by using a meat mincing machine,adding preservative homogenization and homogenization,freeze-drying,and mixed after 80 mesh screening.Under clean and dry conditions,PE plastic bag with aluminum-plastic composite bag is vacuumized.After the uniformity verification was qualified,60co-γ-ray irradiation sterilization and freezing storage were adopted.The CRM.had good uniformity and stability,and is valid for 24 months at-18℃.Multiple laboratories conducted joint calibration using the standard GB 31658.20-2022 isotope internal standard liquid chromatography tandem mass spectrometry method.It can be used as the quality control sample for the detection of aminoalcohol veterinary drug residues in the laboratory,and can be popularized and applied in various fields such as product evaluation,capability verification and method verification.
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