T/FQIA 003-2022 Determination of Residual Amounts of Tungstic Acid, Fluoroglyfyrin, Acrylfentreadione, Cyclosetildehyd, 1-(4-Chlorophenyl)-3-(2,3-dihydro-5-phenyl-2H-1,3-benzodioxol-4-yl)-2-propen-1-one, and 1-(4-chlorophenyl)-3-(2,3-dihydro-5-phenylbenzofuran-7-yl)-2-propen-1-one in Tea by Gas Chromatography-Tandem Mass Spectrometry

Scope

Scope: Scope This document specifies the gas chromatography-tandem mass spectrometry method for the determination of residues of chlorpyrifos, fluorpyrifos, glyphosate, cycloxydim, fenpyroximate, and fenpyrazate in black tea, green tea, white tea, and oolong tea. This document is applicable to the determination of residues of chlorpyrifos, fluorpyrifos, glyphosate, cycloxydim, fenpyroximate, and fenpyrazate in black tea, green tea, white tea, and oolong tea. Other teas can be referenced for implementation. Main technical content: 1. Scope This document specifies the gas chromatography-tandem mass spectrometry method for the determination of residues of chlorpyrifos, fluorpyrifos, glyphosate, cycloxydim, fenpyroximate, and fenpyrazate in black tea, green tea, white tea, and oolong tea. This document is applicable to the determination of residues of chlorpyrifos, fluorpyrifos, glyphosate, cycloxydim, fenpyroximate, and fenpyrazate in black tea, green tea, white tea, and oolong tea. Other teas can be referenced for implementation. 2. Normative reference documents The content of the following documents is an indispensable part of this document through normative reference in the text. Among them, the referenced documents with a date are only applicable to this document for the version corresponding to that date; the unreferenced documents are applicable to this document for the latest version (including all amendment sheets). GB/T 6682 Specifications and Test Methods for Water Used in Analytical Laboratories GB/T 8303 Preparation of Ground Tea Samples and Determination of Their Dry Matter Content 3. Terms and definitions This document does not define any terms or definitions. 4. Principle The samples are extracted with acetonitrile, and the extracts are purified by solid-phase extraction and detected by gas chromatography-tandem mass spectrometry. The quantification is performed by internal standard method or external standard method. Main con

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