T/FQIA 007-2022 Determination of Chlorphthalate Residues in Tea by Gas Chromatography-Tandem Mass Spectrometry

Scope

Scope: Scope This document specifies the gas chromatography-mass spectrometry method for determining the residual amount of chlorophthalic acid in tea. This document is applicable to the determination of chlorophthalic acid residues in green tea, black tea, white tea, and oolong tea. Other types of tea can refer to this document for implementation. Main technical content: 1. Scope This document specifies the gas chromatography-mass spectrometry method for determining the residual amount of chlorophthalic acid in tea. This document is applicable to the determination of chlorophthalic acid residues in green tea, black tea, white tea, and oolong tea. Other types of tea can refer to this document for implementation. 2. Normative referenced documents The content of the following documents is an integral part of this document through normative referencing. Among them, the referenced documents with a specified date are applicable to this document only for the version corresponding to that date; for the referenced documents without a specified date, the latest version (including all amendment sheets) is applicable to this document. GB/T 6682  Specifications and test methods for water used in analytical laboratories GB/T 8303  Preparation of crushed tea samples and determination of their dry matter content 3. Terms and definitions This document does not define any terms or definitions requiring clarification. 4. Principle The tea samples are extracted with water, and the extract is purified by solid-phase extraction and derivatized. The derivatized product, chlorophthalic acid diethyl ester, is detected by gas chromatography-tandem mass spectrometry, and quantified using external standards. Main contents **Preface** **II** 1. Scope 2. Normative referenced documents 3. Terms and definitions 4. Principle 5. Reagents and materials 5.1 Reagents 5.2 Solution preparation 5.3 Standard samples 5.4 Standard solution preparation 5.5

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