Zwitterionic, cationic, and anionic PFAS in freshwater sediments from AFFF-impacted and non-impacted sites of Eastern Canada

Journal of Hazardous Materials, Год журнала: 2024, Номер 484, С. 136634 - 136634

Опубликована: Ноя. 23, 2024

Язык: Английский

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Decontamination and Surface Analysis of PFAS-Contaminated Fire Suppression System Pipes: Effects of Cleaning Agents and Temperature

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Янв. 23, 2025

Per- and polyfluoroalkyl substances (PFAS)-containing firefighting foam have been used in stationary fire suppression systems for several decades. However, there is a lack of research on how to decontaminate PFAS-contaminated infrastructure evaluate treatment efficiency. This study assessed the removal PFAS from stainless steel pipe surfaces using different cleaning agents (tap water, methanol, aqueous solutions containing 10 20 wt % butyl carbitol (BC)) at temperatures (20 °C, 40 70 °C). The content remaining fluorine (F)-containing compounds was evaluated first time time-of-flight elastic recoil detection (ToF-ERD). results showed that 20% BC solution heated °C removed up μg/cm2 ∑PFAS via soaking (targeted analysis). Treatment with 2- 8-fold more effective than tap water 10- 20-fold °C. Total analysis determined by combustion ion chromatography higher F-equivalent compared targeted after treatment, indicating presence significant amount PFAS. Surface ToF-ERD confirmed partial F throughout consecutive intervals, residual leaving risk rebound into F-free foams. Furthermore, supramolecular assemblies least PFOS molecules/nm2 were identified interior surfaces.

Язык: Английский

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Infrared Matrix-Assisted Laser Desorption Electrospray Ionization (IR-MALDESI) Mass Spectrometry Imaging of Per- and Polyfluoroalkyl Substances (PFAS) in Stabilized Soil Cores

Journal of the American Society for Mass Spectrometry, Год журнала: 2025, Номер unknown

Опубликована: Март 18, 2025

Infrared matrix-assisted laser desorption electrospray ionization (IR-MALDESI) was coupled with high-resolution accurate-mass-mass spectrometry (HRAM-MS) to image perfluoroalkyl and polyfluoroalkyl substances (PFAS) in stabilized soil cores. Previous field-scale research demonstrated a substantial decrease the leachability of PFAS following application situ stabilization solidification (S/S) an aqueous film-forming foam (AFFF) source zone. While this previous study empirically confirmed effectiveness S/S, there no definitive identification operative retention mechanisms. Therefore, objective follow-on (1) develop mass spectrometry-based imaging technique for on background control cores (2) determine if chemical characteristics amendments were associated spatially distribution within at micrometer scale. Intact frozen imaged negative ion mode, targeted suspect screening analyses conducted, features identified using lists, analytes presented as raw abundances matched against several databases. IR-MALDESI results colocation PFOS PFHxS non-PFAS (e.g., mono- diglycerides) treatments including amendments, which suggests fixation mechanism

Язык: Английский

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Tuning foam stability under flammable liquid fuel by inorganic nanoparticles

Journal of Molecular Liquids, Год журнала: 2025, Номер unknown, С. 127429 - 127429

Опубликована: Март 1, 2025

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