Advancing PFAS characterization: Enhancing the total oxidizable precursor assay with improved sample processing and UV activation

The Science of The Total Environment, Год журнала: 2023, Номер 909, С. 168145 - 168145

Опубликована: Ноя. 11, 2023

Язык: Английский

---

Research on the PFAS release and migration behavior of multi-layer outdoor jacket fabrics

Journal of Hazardous Materials, Год журнала: 2025, Номер 487, С. 137218 - 137218

Опубликована: Янв. 14, 2025

Язык: Английский

---

Ti3+-Ov dual-defect typed S/N-TiO2-x for photoinduced reduction of highly toxic Cr(VI) at g/L level

Optical Materials, Год журнала: 2025, Номер unknown, С. 116722 - 116722

Опубликована: Янв. 1, 2025

Язык: Английский

---

Selective Quantification of Charged and Neutral Polyfluoroalkyl Substances Using the Total Oxidizable Precursor (TOP) Assay

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

Опубликована: Фев. 13, 2025

Perfluoroalkyl acid (PFAA) precursors are a diverse subclass of per- and polyfluoroalkyl substances (PFASs) that can be transformed into PFAAs public health concern. Unlike strongly acidic PFAAs, anionic, cationic, neutral, or zwitterionic. Precursor charge affects the environmental fate, but existing quantification techniques struggle to ascertain abundance compounds within each group. To fill this gap, we developed validated solid-phase extraction procedure separates by quantifies sum in fraction with total oxidizable precursor (TOP) assay. Method performance was demonstrated spiking known concentrations ten aqueous film-forming foam (AFFF)-impacted groundwater, municipal wastewater, soil samples. fractionation recovery were greater groundwater samples than wastewater. Use method provided results consistent expectations based on transport properties. In surficial soils near an AFFF source zone, anionic five fewer perfluorinated carbons accounted for about 95% PFASs, less half PFASs underlying groundwater. wastewater influent, exceeded approximately equally distributed among all fractions.

Язык: Английский

---

Assessment of PFAS contamination in agricultural soils: non-target identification of precursors, fluorine mass balance and microcosm studies

Journal of Hazardous Materials, Год журнала: 2025, Номер unknown, С. 137798 - 137798

Опубликована: Фев. 1, 2025

Язык: Английский

---

Target and Suspect Screening of Per-and Polyfluoroalkyl Substances (PFASs) in Consumer Products using Ion Mobility Separation High Resolution Mass Spectrometry (IMS-HRMS)

Environmental Pollution, Год журнала: 2025, Номер unknown, С. 126400 - 126400

Опубликована: Май 1, 2025

Язык: Английский

---

What we learn from using mass balance approach and oxidative conversion – a case study on PFAS contaminated soil samples

Environmental Pollution, Год журнала: 2025, Номер unknown, С. 126420 - 126420

Опубликована: Май 1, 2025

Язык: Английский

---

The quest for the perfect “total PFAS” method: how can the total oxidisable precursor (TOP) assay be made reliable?

Analytical and Bioanalytical Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Май 12, 2025

Язык: Английский

---

Distribution and bioaccumulation of per- and polyfluoroalkyl substances (PFASs) in the Kuroshio Extension region of Northwest Pacific Ocean

Water Research, Год журнала: 2024, Номер 265, С. 122256 - 122256

Опубликована: Авг. 12, 2024

Язык: Английский

---

Applying the modified UV-activated TOP assay to complex matrices impacted by aqueous film-forming foams

The Science of The Total Environment, Год журнала: 2024, Номер 924, С. 171292 - 171292

Опубликована: Март 2, 2024

Per- and polyfluoroalkyl substances (PFAS) are a large chemical family, numerous species can co-exist in environmental samples, especially those impacted by aqueous film-forming foams (AFFFs). Given the limited availability of standards, capturing total amount PFAS is challenging. Thus, oxidizable precursor (TOP) assay has been developed to estimate via oxidative conversion precursors into perfluorocarboxylic acids (PFCAs). This study aims enhance robustness TOP replacing heat activation with UV activation. We evaluated molar yields known water presence varying levels Suwannee River natural organic matter (SRNOM) two soils. The impact was also soils spiked three well-characterized AFFFs, six AFFF-impacted field soils, nine rinse samples stainless-steel pipe. In 100 mg/L SNROM, 6:2 fluorotelomer sulfonate (FTS), 8:2 FTS, N-ethyl perfluorooctane sulfonamidoacetic acid (N-EtFOSAA) deionized had good recovery as PFCAs (average 102 ± 9.8 %); at 500 significantly dropped an average 51 19 %. (with 4 % 8.8 matter) individual spikes, 101 9.4 %, except N-EtFOSAA, which reduced soil (OM). UV-activated assays outperformed heat-activated ones, pipe extract 1.4-1.5× higher PFCA recovery. almost all test resulted notable shift towards longer chain lengths, particularly for high OM content. confirmed advantages activation, including shortened exposure time (1 h vs. 6 h) matrix effects from due dual functions activating persulfate photodegrading OM.

Язык: Английский

---