Analysis of zwitterionic, cationic, and anionic poly- and perfluoroalkyl surfactants in sediments by liquid chromatography polarity-switching electrospray ionization coupled to high resolution mass spectrometry
Résumé
A new analytical method is proposed for the determination of a wide span of fluoroalkylated surfactants (PFASs) of various chain lengths and polarities in sediments, including newly-identified compounds such as zwitterionic and cationic PFASs. Extraction conditions were optimized so as to maintain a common preparation procedure for all analytes (recovery range: 60–110%). Instrumental analysis was performed with ultra-high performance liquid chromatography coupled to Orbitrap mass spectrometry through polarity-switching electrospray ionization. Calibration curves with excellent coefficients of determination (R2>0.994) were generally obtained over 0.002–10 ng g−1 dry weight (dw) and limits of detection were in the range 0.0006–0.46 ng g−1 dw. Intra-day precision remained<9% and inter-day precision<23%. While perfluorooctane sulfonate (PFOS) generally prevailed over other perfluoroalkyl acids (PFAAs) in sediments from mainland France, fluorotelomer sulfonamide amines and fluorotelomer sulfonamide betaines were also ubiquitous in these samples, especially in the vicinity of airports wherein firefighting training activities may occur on a regular basis.
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