T/AFFI 011-2022 Determination of Residual Amounts of Gibberellic Acid and Clopyralim in Fruit Products by Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)

Scope

Main Technical Content: Determination of Gibberellins and Chlorpyrifos Residues in Fruit Products 1. Scope This document applies to dried grapes, dates, and other fruit products in Xinjiang. It specifies the testing methods for plant growth regulators—Gibberellins and Chlorpyrifos in dried grapes and dates. 2. Normative Reference Documents The referenced documents in this document are essential for its application. For dated referenced documents, only the version on the specified date applies to this document. For undated referenced documents, the latest version (including all amendments) applies. GB/T 6682—Specifications and Test Methods for Water Used in Analytical Laboratories 3. Terms and Definitions 3.1 Fruit Products Products made from fruits through various processing methods such as natural drying or baking. 3.2 Plant Growth Regulators Artificially synthesized (or naturally extracted from microorganisms) organic compounds with growth and development regulatory effects similar to natural plant hormones. This document primarily refers to Gibberellins (GA3) and Chlorpyrifos (4-CPPU). 4. Principle The sample is extracted with a 1% formic acid-acetonitrile solution, and the extract is purified by dispersive solid-phase extraction. The analysis is performed using liquid chromatography-triple quadrupole mass spectrometers, with quantification by external standard method. 5. Reagents and Materials Unless otherwise specified, only reagents certified as analytical grade and water meeting the first-level standards specified in GB/T 6682 are used in the analysis. 5.1 Reagents 5.1.1 Acetonitrile (chromatography grade); 5.1.2 Sodium chloride (analytical grade); 5.1.3 Anhydrous magnesium sulfate (analytical grade); 5.1.4 Formic acid (chromatography grade); 5.1.5 Sodium citrate dihydrate (analytical grade); 5.1.6 Sodium citrate dihydrate hemihydrate (analytical grade); 5.1.7 1% formic acid-acetonitrile solution: Measure 10 mL of f

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