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• W2904342803 abstract "Polyaromatic hydrocarbons (PAHs) are listed as priority pollutants by the United States Environmental Protection Agency (U.S. EPA). PAH-contaminated samples often require extensive sample cleanup before analysis, with the method used dependent upon the sample matrix. We present condensed phase membrane introduction mass spectrometry with liquid electron ionization (CP-MIMS–LEI) as a sensitive and universal technique that can directly analyze both aqueous and soil samples for PAHs without the need for sample clean up or instrumental modifications for different matrixes. The method uses a semipermeable hollow fiber membrane immersion probe to transfer analytes from complex samples into a solvent acceptor phase that is directly entrained at nanoliter/min flows to an LEI-interfaced mass spectrometer. The resulting aerosol is desolvated under vacuum leading to analyte vaporization and subsequent electron ionization. Electron energy and LEI vaporization capillary position were examined and optimized for PAHs. The CP-MIMS probe was directly immersed in complex aqueous matrixes, demonstrating low nanogram per liter PAH detection limits and response times of ≤1.6 min. For soil sample analysis, 2-propanol was found to be the optimal PAH sampling solvent. Soil samples were briefly sonicated in 2-propanol, followed by direct CP-MIMS measurement. Soil sample throughput was ca. 15 samples/h, with PAH quantitation successful at microgram per kilogram levels. The workflow is remarkably simple, fast, green, and leads to reproducible results that enable high-throughput screening of heterogeneous soil samples." @default.
• W2904342803 created "2018-12-22" @default.
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• W2904342803 date "2018-12-18" @default.
• W2904342803 modified "2023-10-16" @default.
• W2904342803 title "Direct Analysis of Polyaromatic Hydrocarbons in Soil and Aqueous Samples Using Condensed Phase Membrane Introduction Tandem Mass Spectrometry with Low-Energy Liquid Electron Ionization" @default.
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• W2904342803 doi "https://doi.org/10.1021/acs.analchem.8b04949" @default.
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