The investigation of the enrichment behavior of identified PFAS and unknown PFAA-precursors in water and suspended particulate matter of the surface microlayer: A case study in Tianjin (China)

Water Research, Journal Year: 2024, Volume and Issue: 260, P. 121944 - 121944

Published: June 14, 2024

Language: Английский

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An optimized method for PFAS analysis using HR-CS-GFMAS via GaF detection

Talanta, Journal Year: 2024, Volume and Issue: 281, P. 126811 - 126811

Published: Sept. 4, 2024

Language: Английский

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Analysis of needs for enforcement of PFAS in articles and chemical products

TemaNord, Journal Year: 2024, Volume and Issue: unknown

Published: March 13, 2024

Introduction 1.1 Objectives of the project 1.1.1Methodology 1.1.2Literature search 1.1.3Stakeholder consultation activities 2 Overview on PFAS analytical methods 2.1 Determination total luorine content 2.1.1Combustion Ion Chromatography (CIC) 2.1.2High resolution-continuum source-graphite furnace molecular absorption spectrometry (HR-CS-GF-MAS) 2.1.3Particle induced gamma-ray Emission (PIGE) 2.1.4Laser-induced breakdown spectroscopy (LIBS) 2.1.5X-ray photoelectron (XPS) 2.1.6WD-X-ray Fluorescence (WDXRF) 2.1.7Instrumental Neutron Activation Analysis (INAA) 2.1.8Summary key information 2.2 Non-targeted & suspect screening using High Resolution Mass Spectrometry (HRMS) 2.2.1 high-resolution mass approaches 2.2.2 Suspect 2.2.3 analysis 2.2.4 mobility spectrometryPFAS in products and environment" "Nordic Enforcement PFOS PFOA chemical articles" .With existing upcoming PFAS-restrictions, not least restriction proposals containing limit values for sum PFAS, there is a need development improvement analysis.[1][2]This report, initiated by Nordic Working Group Chemicals, Environment, Health (NKE), aims to evaluate current situation related PFAS-analyses enforcement propose measures/strategies enable and/or improve compliance with future restrictions.The work preparation this report were carried out jointly Ramboll Deutschland GmbH Flemish Institute technological research (VITO), contact group consisting NKE members from Sweden, Norway, Denmark Finland.1. https://www.norden.org/en/publication/analytical-methods-pfas-products-and-environment 2. https://www.norden.org/en/publication/nordic-enforcement-project-pfos-and-pfoa-chemical-products-and-

Language: Английский

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Persulfate based total oxidizable precursor (TOP) assay approaches for advanced PFAS assessment in the environment ̶ a review

Trends in Environmental Analytical Chemistry, Journal Year: 2024, Volume and Issue: unknown, P. e00242 - e00242

Published: Oct. 1, 2024

Language: Английский

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Can qualitative non-target data be indicative of PFAS contamination? First evidence by correlation with EOF in environmental samples

Published: May 10, 2024

We combined and correlated non-target screening (NTS) features extractable organic fluorine (EOF) data for PFAS analysis in environmental samples. Soils, sediments, ashes from different locations (Germany, France, Lithuania) (n=34) were extracted analyzed via liquid chromatography-high-resolution mass spectrometry (LC-HRMS) high resolution-continuum source-graphite furnace molecular absorption (HR-CS-GFMAS). NTS feature prioritization based on the to carbon (m/C) defect (MD/C) ratio was applied discriminate potential common co-extracted matrix. Our results show a correlation between quantitative EOF with prioritized number (R2 = 0.87, rPearson 0.93) as well total peak area of 0.97, 0.98) while commonly MD filtering showed no EOF. The observed highly significant correlations highlight that MD/C-m/C is associated good indication overall burden evidenced by Also, semi-quantitative can be PFAS-specific shown vs. areas. indicate lowly fluorinated compounds negligible mostly composed higher substances. recommend further investigation unique complementary combination screening.

Language: Английский

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PFΔScreen – An open-source tool for automated PFAS feature prioritization in non-target HRMS data

Published: Sept. 26, 2023

Per- and polyfluoroalkyl substances (PFAS) are a huge group of anthropogenic chemicals with unique properties that used in countless products applications. Due to the high stability their C–F bonds, PFAS or transformation (TPs) persistent environment, leading ubiquitous detection various samples worldwide. Since industrial chemicals, availability authentic reference standards is limited, making non-target screening (NTS) approaches based on high-resolution mass spectrometry (HRMS) necessary for more comprehensive characterization. NTS usually time-consuming process, since only small fraction detected can be identified. Therefore, efficient prioritization relevant HRMS signals one most crucial steps. We developed PFΔScreen, Python-based open-source tool simple graphical user interface (GUI) perform feature by several specific techniques such as highly promising MD/C-m/C approach, Kendrick defect analysis, diagnostic fragments (MS2), fragment differences (MS2) suspect screening. Feature from vendor-independent MS raw data (mzML, data-dependent acquisition) performed via pyOpenMS (or custom lists) subsequent calculations identification both HPLC- GC-HRMS data. The PFΔScreen workflow presented four PFAS-contaminated agricultural soil south-western Germany. Over 15 classes (more than 80 single compounds isomers) could identified, including novel classes, potentially TPs precursors fluorotelomer mercapto alkyl phosphates (FTMAPs). within Python environment easily automatically installable executable Windows. Its source code freely available GitHub (https://github.com/JonZwe/PFAScreen).

Language: Английский

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Perfluoroalkyl acid precursor or weakly fluorinated organic compound? A proof of concept for oxidative fractionation of PFAS and organofluorines

Analytical and Bioanalytical Chemistry, Journal Year: 2024, Volume and Issue: 416(29), P. 6799 - 6808

Published: Oct. 12, 2024

Abstract Organofluorine mass balance approaches are increasingly applied to investigate the occurrence of per- and polyfluoroalkyl substances (PFAS) other organofluorines in environmental samples more comprehensively. Usually, complex prevent identification quantification every fluorine-containing molecule. Consequently, large unidentified fractions between fluorine sum parameters such as extractable organic (EOF) quantified analytes frequently reported. We propose using oxidative conversion separate (unidentified) weakly fluorinated compounds (e.g., pesticides, pharmaceuticals) from PFAA-precursors (perfluoroalkyl chain lengths ≥ C 6 ). show with three organofluorine model (flufenamic acid, diflufenican, pantoprazole) that CF 3 -groups or aromatic can be quantitatively converted inorganic fluoride trifluoroacetic acid (TFA) by applying PhotoTOP oxidation (UV/TiO 2 The principle separation mixtures is demonstrated together PFAA-precursor 6:2/6:2 fluorotelomer mercaptoalkyl phosphate diester (FTMAP). After oxidation, products F − TFA were separated PFCAs (> 4 ) SPE, analyzed individually. Closed balances both without addition matrix achieved. Eventually, was verified total measurements combustion ion chromatography (CIC). proposed methods should considered a proof concept potentially explain EOF, especially if low content pharmaceuticals, their transformation contribute largely EOF. Future studies needed applicability complexity samples. Graphical

Language: Английский

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An Optimized Method for Pfas Analysis Using Hr-Cs-Gfmas Via Gaf Detection

Published: Jan. 1, 2024

Language: Английский

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Latest trends in the environmental analysis of PFAS including nontarget analysis and EOF-, AOF-, and TOP-based methodologies

Analytical and Bioanalytical Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 21, 2024

Language: Английский

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