Detection of veterinary drug residue parameters in dairy products

This standard specifies a high-performance liquid chromatography-tandem mass spectrometry method for the determination of residues of amoxicillin, ampicillin, piperacillin, penicillin G, penicillin V, oxacillin, cloxacillin, nefcillin, and diclofacillin in milk and powdered milk. The standard is applicable to the determination and confirmation of residues of amoxicillin, ampicillin, piperacillin, penicillin G, penicillin V, oxacillin, cloxacillin, nefcillin, and diclofacillin in milk and formula. The detection limit of the method in this standard: 1 pg/kg for ampicillin and nefcillin in milk, 2 xug/kg for amoxicillin, piperacillin, penicillin G, penicillin V, cloxacillin, 4 ng/kg for oxacillin and diclofacillin, 8 pag/kg for ampicillin and nefcillin in powder, 8 pag/kg for amoxicillin, piperacillin, penicillin G, penicillin V, cloxacillin, 16 pag/kg for oxacillin, Dichloropenicillin is a 32 pagr/kg. 2 normative reference document. The clauses in the following documents become the clauses of this standard through the reference surface of this standard. For dated reference documents, all subsequent amendments (excluding erroneous content) or revisions are not applicable to this standard. Therefore, 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 references, the latest version applies to this standard. GB/T 6379.1 Accuracy (Accuracy and Precision) of Measurement Methods and Results - Part 1: General Principles and Definitions (GB/T 6379.1-2004, ISO 5725-11994, 1DT) GB/T 6379.2 Accuracy (Accuracy and Precision) of Measurement Methods and Results - Part 2: Basic Methods for Determining the Repeatability and Reproducibility of Standard Measurement Methods (GB/T 6379.2-2004.1SO 5725-2; 1994. IDT) GB/T 6682 Specification and Test Methods for Analytical Laboratory Water (GB/T 6682-2008. ISO 3696; 1987, MOD) 3 Principle: Using acetonitrile aqueous solution to extract analytes from the sample, solid-phase extraction column purification, high-performance liquid chromatography tandem mass spectrometry determination, and external standard method quantification. Unless otherwise specified, all reagents and materials used are analytical pure, and the water is the first grade water specified in GB/T 6682. 4.1 Bet: Liquid chromatography pure. 4.2 Acetic acid: liquid chromatography pure. 4.3 Disodium hydrogen phosphate. 4.4 Sodium hydroxide. 4.5 5 mol/L sodium hydroxide solution: Dissolve 100 g of sodium hydroxide (4.4) in 450 mL of water and add water to a constant volume of 500 mL. 4.6 0.1 mol/L. Phosphate buffer solution: Dissolve 6g of disodium hydrogen phosphate (4.3) in 450 mL of water, adjust pH to 8 with sodium hydroxide solution (4.5), add water to 500 mL, and prepare before use. 4.7 Acetonitrile aqueous solution (3+1): Mix 300 mL of acetonitrile (4.1) with 100 mL of water

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