Hexachlorocyclohexane (including α- 666 β- 666 γ- 666 δ- 666) Testing

This standard specifies the gas chromatography-mass spectrometry method for the determination of 490 pesticides and related chemicals (see Appendix A and Appendix F) residues in green tea, black tea, Pu'er tea, and oolong tea, as well as the gas chromatography-mass spectrometry method for the determination of 29 acidic herbicide residues in green tea, black tea, Pu'er tea, and oolong tea. This standard is applicable to the qualitative identification of 490 pesticide and related chemical residues in green tea, black tea, Pu'er tea, and oolong tea. Among them, 453 types of pesticides and related chemicals can be quantitatively determined, as well as dichloropyrrhetinic acid, benzoic acid, p-chlorophenoxyacetic acid, dichlorophenoxyacetic acid, Dicamba, 2-methyl-4-chloro, 2.4-dropropionic acid, bromobenzonitrile, 2.4-drop, trichloropyrrhetinic acid, 1-theacetic acid, 5-chlorophenol, 24,5-dropropionic acid in green tea, black tea, Pu'er tea, and oolong tea Determination of residues of 29 acidic herbicides, including chloramphenicol, 2-methyl-4-chlorobutyric acid, 2,4+5-aldehydes, fluconazole, 2n4-dibutyric acid, bentazone, iodobenzonitrile, chlorpyrifos, chlorpyrifos, metocloprid, trifluorocarboxylate, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos. The detection limit of 453 pesticides and related chemicals quantitatively determined in this standard is 0.001 mg/kg~0.500 mg/kg (see Appendix A). The detection limit of 29 acidic herbicides is 0.01 mg/kg. 2 Normative references: The clauses in the following documents have become clauses of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding errors) or revisions are not applicable to this standard. However, parties to 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 I: General Principles and Definitions (GB/T 6379.1-2004.1SO 5725-1; 1994.1DT) GB/T 6379,2 Accuracy (Accuracy and Precision) of Measurement Methods and Results Part?: Basic Methods for Determining the Repeatability and Reproducibility of Standard Measurement Methods (GB/T 6379.2-2004.1SO 5725-2; 1994.1DT) SN/T 0918-2000 Sampling Method for Import and Export of Tea 3. Determination of 490 Pesticides and Related Chemicals Residues in Tea by Gas Chromatography-Mass Spectrometry 3.1 Principle: The sample is extracted uniformly with acetonitrile, purified by a solid-phase extraction column, eluted with acetonitrile toluene for pesticides and related chemicals, detected by gas chromatography-mass spectrometry, and quantified by internal standard method. 3.2 Reagents and Materials 3.2.1 Acetonitrile: Chromatographic purity. 3.2.2 Toluene; Superior pure. 3.2.3 Acetone: analytically pure, re distilled. 3.2.4 Dichloromethane; Chromatographic purity. 3.2.5- n-hexane: analytically pure, re distilled. 3.2.6 Methanol: Chromatically pure. 3.2.7 Anhydrous sodium sulfate: analytically pure. Burn at 650 ℃ for 4 hours. Store in a dryer and cool for backup use. 3.2.8 Acetonitrile Toluene (3.1 by volume)

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