T/CQEEMA 12-2025 Soil—Determination of 2 dicofol—Gas chromatography/Mass spectrometry

Scope

The "Determination of Two Types of Dicofol in Soil by Gas Chromatography-Mass Spectrometry" aims to fill the technical gap in the monitoring of new pollutants in soil and support the implementation of the "List of Key Controlled New Pollutants (2023 Edition)". The document targets two target compounds, 2,4'-dicofol and 4,4'-dicofol, and innovatively adopts an alkali hydrolysis processing strategy: soil samples are subjected to pressurized fluid extraction and alkali hydrolysis with potassium hydroxide solution to convert the target compounds into stable conversion products, dichlorodiphenylketone. The samples are then purified and concentrated by Florisil silica gel column, and finally analyzed by gas chromatography-mass spectrometry in selected ion mode and quantified by internal standard method. When the sampling amount is 10.0 g, the detection limit is 0.02 mg/kg, and the determination limit is 0.08 mg/kg. The document fills the detection gap of two types of dicofol in soil medium, solves the technical challenge of detecting the thermal degradation of dicofol, and enhances the universality and accuracy of new pollutant monitoring, providing standardized support for environmental risk assessment and pollution control.

Development Information

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