Food and health food (drug residue) testing

This standard specifies the preparation of samples and gas chromatography-mass spectrometry for the detection of sodium pentachlorophenol residues in animal derived food crystals. This standard is applicable to the detection of sodium pentachlorophenol residues in pig muscles, liver and kidneys, as well as chicken muscles and liver tissues. 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 references, the latest version (including all modification orders) applies to this document. GB/T 6682 Specification and Test Methods for Analysis of Laboratory Water -3 Principles: Residual Sodium Pentaphhenol in Test Materials - Protein Precipitation with Trioxoacetic Acid - Extraction with Cyclohexane Ethyl Acetate Solution. Derived from acetic anhydride pyridine solution, determined by gas chromatography-mass spectrometry, and quantified by external standard method. Unless otherwise specified, all reagents used below 4 reagents and materials are analytical pure reagents; Water is a first-class water that meets the requirements of GB/T6682. 4.1 Sodium pentachlorophenol standard: content ≥ 98.0%. 4.2 Potassium carbonate. 4.3 n-hexane 4.4 Cyclohexane. 4.5 Ethyl acetate. 4.6 Acetic anhydride. 4.7 Pyridine. 4.8 Trigas acetic acid. 4.9 Concentrated hydrochloric acid. 4.10 5% trichloroacetic acid solution; Take 5 g of chloroacetic acid solution, dissolve and dilute with water to 100 ml. 4.11 2.4 mol/L hydrochloric acid solution: Take 20 mL of concentrated hydrochloric acid, dissolve and dilute with water to 100 ml. 4.12 Cyclohexane ethyl acetate solution: Take 10 mL of ethyl acetate, add 40 mL of cyclohexane, and mix well. 4.13 Acetic anhydride pyridine solution: Take 10 mL of acetic anhydride and add 10 mL of pyridine. Mix well and prepare for use. 4.14 0.2 mol/L potassium carbonate solution: Dissolve 27.6 g of potassium carbonate in water and dilute to 1 000 mL. 4.15 1 mg/mL of pentachlorophenol sodium standard stock solution: Accurately weigh 10 mg of pentachlorophenol sodium standard stock solution, place it in a 10 mL volumetric flask, dissolve and dilute with water to the mark, and prepare a concentration of 1 mg/mL of pentachlorophenol sodium standard stock solution- Stored at temperatures below 20 ° C, with a validity period of 3 months

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