PFAS webinar on TOP assay and linear/branched isomers
PFAS (per- and polyfluorinated alkyl substances) is a wide group of compounds with continued topicality. For example, the significantly lowered TWI (tolerable weekly intake) value from EFSA and the inclusion of PFAS in the revised DWD (drinking water directive) highlight recent regulation and development. Frequently a set of known regulated or recommended PFAS are analysed, and the potential contribution from so called precursors is often overlooked. Precursors are known or unknown compounds that may degrade to their backbone PFAS molecules. TOP (total oxidizable precursors) is a method by which many precursors can be chemically oxidized to corresponding measurable PFAS. Branched PFAS isomers have slightly different phys/chem properties to the linear ones. Determination of the fractions of branched/linear PFAS isomers can give further input in environmental assessment and also assist the interpretation of TOP results.
The webinar will include two presentations:
Our development chemist, Patrik Karlsson (MSc), will describe the TOP assay, what happens, how it is performed and results produced, with focus on soil and water. Quality aspects and potential problems will also be mentioned. Fire fighting foam (AFFF) is a challenging matrix and Patrik will share some of our experiences. Origin, occurrence and determination of branched and linear PFAS is another area that will be presented, for example the distribution in natural waters.
Patrick van Hees (Assoc Prof) will present two case studies with AFFF polluted soils and how TOP was used to investigate both the quantity and composition of precursors. For one set of soils leaching tests were also performed. The use of branched/linear fractions in the assessment will be discussed. The presence of the amide FHxSA as “indicator” substance is an additional topic. Eurofins range and offer for PFAS will be presented.
Agenda Fri 29 Jan 2021, 10-11 am:
TOP - principles, procedure and outcome – Patrik Karlsson (Eurofins SE)
TOP in assessment of AFFF contaminated soil – Patrick van Hees (Eurofins SE/Örebro University SE)
To register follow the link to our GoToWebinar page.
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The webinar is free of charge. Presentations will be in English. Questions can be asked in English or Swedish. Please register your participation by 28 Jan (Thurs). The number of participants is limited.