Detection of veterinary drug detection parameters

This standard specifies a liquid chromatography-tandem mass spectrometry method for the determination of residual amounts of enrofloxacin, difloxacin, ciprofloxacin, sarafloxacin, obifloxacin, difloxacin, and mabofloxacin in milk and powdered milk. This standard is applicable to the determination and confirmation of residual amounts of enrofloxacin, ofloxacin, ciprofloxacin, sarafloxacin, obifloxacin, difloxacin, and mabofloxacin in milk and powdered milk. The detection limit of the method in this standard; Enrofloxacin, Dafloxacin, Ciprofloxacin, Salafloxacin, Obifloxacin, Diflufloxacin, and Mabaofloxacin in milk are all 1 pg/kg; Enrofloxacin, Dafloxacin, Ciprofloxacin, Salafloxacin, Obifloxacin, Diflufloxacin, and Mabaofloxacin in milk powder are all 4 ug/kg. 2 Normative References: The clauses in the following documents become clauses of this standard through reference in this standard. For dated references, All subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, all parties who have reached agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated reference documents, the latest version is applicable to this standard. GB/T 6379.1 Accuracy (Accuracy and Precision) of Measurement Methods and Results Part I - General Principles and Definitions (GB/T 6379.1-2004, ISO 5T25-11994, IDT) GB/T 6379.2 Measurement Methods and Accuracy of Results (Accuracy and Precision) Part 2: Basic Methods for Determining the Repeatability and Reproducibility of Standard Measurement Methods (GB/T 6379.2-2004, ISO 5725-2:1994, IDT) GB/T6682, Specification and Test Methods for Analytical Laboratory Water (GB/T6682-2008, ISO 36961987, MOD) 3 Principles for Extracting Residual Enrofloxacin from Samples Using Acetonitrile and Phosphate Buffer Solutions, Dafloxacin, ciprofloxacin, sarafloxacin, obifloxacin, difloxacin, and mabofloxacin, purified by Oasis HLB solid-phase extraction column, eluted with 5% ammonia water methanol solution, determined by liquid chromatography-tandem mass spectrometry, and quantified by external standard method. 4 Reagents and materials Unless otherwise specified, all test agents used are high-grade pure, with water being the first grade water specified in GB/T6682. 4.1 Methanol: chromatographic pure. 4.2 Acetonitrile: chromatographic pure. 4.3 Phosphoric acid: chromatographic pure. 4.4 Formic acid: chromatographic pure

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