A polyfluorinated compound built by telomerization, with a perfluorinated carbon tail and a non-fluorinated functional head. Fluorotelomers are PFAS precursors: they transform in the environment and in biota into stable perfluorinated acids such as PFOA and PFHxS.
Fluorotelomers are manufactured by telomerization of tetrafluoroethylene, producing chains such as 8:2 FTOH (eight perfluorinated carbons followed by two non-fluorinated carbons bearing an alcohol). They are used in stain- and grease-resistant coatings for textiles, paper, and food packaging, and were a primary surfactant base for modern AFFF firefighting foams after the 2002 phase-out of PFOS-based formulations.
Fluorotelomers are PFAS precursors. Microbial action, oxidation in soil, and metabolism in vertebrates transform them stepwise into perfluorinated carboxylic acids. Total Oxidizable Precursor (TOP) assays are used in the laboratory to convert all oxidizable precursors in a sample into measurable perfluorinated acids, revealing the true PFAS burden that targeted analysis alone would miss.
From a remediation standpoint, fluorotelomer contamination is a hidden load on a site: standard PFAS analytics may underreport total mass by an order of magnitude, and any destruction process must handle both the precursors and the terminal perfluorinated acids they generate.
Also known as: fluorotelomer alcohol, FTOH, 6:2 FTS, 8:2 FTOH.
PFAS (Per- and Polyfluoroalkyl Substances): treatment approach
A family of thousands of synthetic fluorinated organics — including PFOA, PFOS, GenX, PFHxS, and AFFF constituents — defined by C-F bonds that resist conventional treatment and require destruction technologies to close a site.
Per- and polyfluoroalkyl substances: a class of more than 12,000 synthetic compounds built around exceptionally stable carbon-fluorine bonds. PFAS is the family name, not a single chemical. PFOA and PFOS are two specific members of this class.
Perfluorooctanoic acid: a specific eight-carbon long-chain PFAS compound, historically used in non-stick coatings and AFFF firefighting foam. Classified by IARC in 2023 as Group 1, carcinogenic to humans.
Perfluorooctane sulfonic acid: a specific eight-carbon long-chain PFAS compound, historically the active surfactant in 3M Scotchgard and AFFF firefighting foam. Classified by IARC in 2023 as Group 2B, possibly carcinogenic to humans.
Polychlorinated dibenzo-p-dioxins and related furans: highly persistent, fat-soluble chlorinated compounds formed as unintended byproducts of combustion, chlorine-based manufacturing, and herbicide production, with TCDD among the most toxic substances ever characterized.