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The type of PFAS remediation technology selected is often a reflection of the PFAS contamination levels and the PFAS signature (i.e. the combination of short- and long-chain PFAS substances present) in conjunction with the site-specific water chemistry and cross contaminants present in the liquid stream.
The so-called “forever chemicals” − a name attributed to PFAS' centuries-long half-life − are ubiquitous: In addition to drinking water, they are found in everything from non-stick ...
One major way PFAS seep into food is when the chemicals are used in manufacturing, so it’s important that companies take steps to prevent PFAS from coming in contact with soil, water or outside air.
Trifluoroacetic acid is a widely employed acid, used for example in the synthesis of peptides.Its esters are useful in analytical chemistry. Longer-chain perfluoroalkyl carboxylic acids, e.g. with five to nine carbons, are useful fluorosurfactants and emulsifiers used in the production of polytetrafluoroethylene (Teflon) and related fluoropolymers.
Perfluorooctanesulfonic acid is usually used as the sodium or potassium salts. PFOS was the key ingredient in Scotchgard, a fabric protector made by 3M, and numerous stain repellents. PFOS, together with PFOA, has also been used to make aqueous film forming foam (AFFF), a component of fire-fighting foams, and alcohol-type concentrate foams.
Per- and polyfluoroalkyl substances – also known as PFAs – are widely used, long lasting chemicals found in many consumer, commercial, and industrial products. [2] Breaking down very slowly in the environment, PFAs have been found in water, air, fish, soil, the blood of humans and animals, and food products around the world.
Story at a glance A group of potentially harmful chemicals called per- and polyfluoroalkyl substances (PFAS) have repeatedly cropped up in headlines. But the sheer number of chemicals in this ...
Name Abbreviation Structural formula Molecular weight (g/mol) CAS No. Perfluoropropanesulfonic acid: PFPrS C 3 F 7 SO 3 H 250.09 423-41-6 Perfluorobutanesulfonic acid: PFBS C 4 F 9 SO 3 H 300.10 375-73-5 Perfluoropentanesulfonic acid: PFPS C 5 F 11 SO 3 H 350.11 2706-91-4 Perfluorohexanesulfonic acid: PFHxS C 6 F 13 SO 3 H 400.12 355-46-4 ...