Facile identification of fluorosurfactant category in aqueous film-forming foam concentrates <i>via</i> optimized ¹⁹F NMR.

ABSTRACT: Aqueous film-forming foams (AFFFs) are the primary source of toxic perfluoroalkyl and polyfluoroalkyl substances (PFAS) in wastewater. Thus, it is urgent to develop a facile and fast method for identifying fluorosurfactants in commercially available AFFFs. In this work, fluorine nuclear magnetic resonance (¹⁹F NMR) spectroscopy was optimized to measure AFFFs directly with the extra addition of 5% D₂O as the locking reagent, and high-quality spectra could be acquired within 4 min (0.1% fluorosurfactant content). Recovery experiments demonstrated that the use of different AFFFs had no marked influence on the quantitative analysis of fluorosurfactants. Such method works with low-field NMR spectroscopy (1.4 T) as well. Two-dimensional (2D) ¹⁹F COSY NMR was used

SUBMITTER: Chen P 

PROVIDER: S-EPMC12406522 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature