Research & Advanced Engineering, Ford Motor Company, Mail Drop RIC-2122, Dearborn, Michigan 48121-2053, USA.
Department of Chemistry and Biochemistry, California State University Northridge, 18111 Nordhoff St., Northridge, CA 91330-8262, USA.
Environ Sci Process Impacts. 2021 Dec 15;23(12):1834-1838. doi: 10.1039/d1em00296a.
We argue that there is a need for a more precise of PFAS in a way that avoids including compounds with single CF-, -CF-, or CF- groups and excludes TFA and compounds that degrade to just give TFA. An example that meets this need is the definition by the U.S. Environmental Protection Agency of PFAS as "per- and polyfluorinated substances that structurally contain the unit R-(CF)-C(F)(R)R. Both the CF and CF moieties are saturated carbons and none of the R groups (R, R, or R) can be hydrogen". Adoption of this definition, or one like it, would place future technical and regulatory discussions of the environmental impacts of organo-fluorine compounds on a sounder technical footing by focusing PFAS discussions and regulation on long-chain perfluoroalkyl sulfonic acids and perfluoroalkyl carboxylic acids.
我们认为，需要更精确地定义 PFAS，避免将含有单个 CF-、-CF2-或 -CF3-基团的化合物以及全氟辛酸（TFA）和仅降解为 TFA 的化合物包括在内。满足这一需求的一个例子是美国环境保护署对 PFAS 的定义，即“含有单元 R-(CF)n-C(F)(R)R 的全氟和多氟化合物。CF 和 CF 部分均为饱和碳原子，并且 R 基团（R、R'或 R''）均不能为氢”。采用这一定义或类似定义，将通过将 PFAS 讨论和法规集中在长链全氟烷磺酸和全氟烷羧酸上来为有机氟化合物的环境影响的未来技术和法规讨论奠定更坚实的技术基础。
