Other pesticide residue detection

This standard specifies the liquid chromatography-mass spectrometry method for the determination of 448 pesticides and related chemicals (see Appendix A) residues in green tea, black tea, Pu'er tea, and oolong tea. This standard is applicable to the qualitative identification of 448 pesticides and related chemical residues in green tea, black tea, Pu'er tea, and oolong tea, as well as the quantitative determination of 418 pesticides and related chemical residues. Other tea leaves can refer to the implementation. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated reference documents, the latest version (including all modification forms) is applicable to this document. GB 2763 National Food Safety Standard for Maximum Residue Limits of Pesticides in Food GB/T 6682 Specification and Test Methods for Analytical Laboratory Water GB/T 6682 Principle: The sample is extracted with acetonitrile homogenate, purified by solid-phase extraction column, washed with acetonitrile toluene solution (3+1) for pesticide and related chemicals, and detected by liquid chromatography-tandem mass spectrometry, Quantitative analysis using external standard method. Unless otherwise specified, all reagents and materials are analytical pure, and water is grade one water in accordance with GB/T 6682. 4.1 Reagent 4.1.1 Acetonitrile (CH: CN, 75-05-8): Chromatically pure. 4.1.2 Toluene (CHs, 108-88-3): premium grade pure. 4.1.3 Acetone (CH: COCHs, 67-64-1): Chromatically pure. 4.1.4 Isooctane (CsHis, 540-84-1): Chromatically pure. 4.1.5 Methanol (CH; OH, 67-56-1/170082-17-4): Chromatically pure. 4.1.6 Acetic acid (CH: COOH, 64-19-7): premium grade pure. 4.1.7 Sodium chloride (NaCl, 7647-14-5>): analytically pure. 4.1.8 Anhydrous sodium sulfate (NagSO, 7757-82-6): analytically pure. Burn at 650 ℃ for 4 hours before use, store in a dryer, and cool for later use. 4.2 Solution Preparation 4.2.10.1% formic acid solution: Take 1000 mL of water, add 1 mL of formic acid, shake well, and set aside. 4.2.25mmol/L ammonium acetate solution: Weigh 0.385g of ammonium acetate, dilute with water to 100OmL. 4.2.3 Acetonitrile toluene solution (3+1): Take 300 mL of acetonitrile, add 100 mL of toluene, shake well and set aside. 4.2.4 Acetonitrile+aqueous solution (3+2): Take 300 mL of acetonitrile, add 200 mL of water, shake well, and set aside. 4.3 Standard substances for pesticides and related chemicals: Purity ≥ 95%, see Appendix A. A standard concentrated interview preparation

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