T/CQEEMA 10-2025 Soil and sediment—Determination of 2 phthalate esters —Liquid chromatography triple quadrupole mass spectrometry

Scope

The "Determination of Two Phthalate Esters in Soil by Liquid Chromatography-Triple Quadrupole 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 innovatively uses liquid chromatography-mass spectrometry to determine the qualitative issues of two target compounds, namely diisononyl phthalate and diisodecyl phthalate in soil and sediment samples. The samples are extracted with acetonitrile, purified by solid-phase extraction columns, and determined by liquid chromatography-triple quadrupole mass spectrometry. The qualitative determination is based on retention time and characteristic ion abundance ratio, and the quantitative determination is based on internal standard method. When the sampling amount is 5 g, the sample volume is 10.0 mL, and the injection volume is 5 μL, the method detection limits of DINP and DIDP are both 4 μg/kg, and the determination lower limits are both 16 μg/kg. The document fills the detection gap of these two phthalate esters in soil and sediment media, solves the technical problem of insufficiently accurate qualitative detection, and improves the universality and accuracy of new pollutant monitoring, providing standardized support for environmental risk assessment and pollution control.

Development Information

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