Department of Civil Engineering, Stony Brook University, Stony Brook, New York 11794, United States.
New York State Center for Clean Water Technology, Stony Brook University, Stony Brook, New York 11794, United States.
Environ Sci Technol. 2022 Nov 15;56(22):15207-15219. doi: 10.1021/acs.est.2c05518. Epub 2022 Oct 31.
Many environmentally relevant poly-/perfluoroalkyl substances (PFASs) including perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) exist in different isomeric (branched and linear) forms in the natural environment. The isomeric distribution of PFASs in the environment and source waters is largely controlled by the source of contamination and varying physicochemical properties imparted by their structural differences. For example, branched isomers of PFOS are relatively more reactive and less sorptive compared to the linear analogue. As a result, the removal of branched and linear PFASs during water treatment can vary, and thus the isomeric distribution in source waters can influence the overall efficiency of the treatment process. In this paper, we highlight the need to consider the isomeric distribution of PFASs in contaminated matrices while designing appropriate remediation strategies. We additionally summarize the known occurrence and variation in the physicochemical properties of PFAS isomers influencing their detection, fate, toxicokinetics, and treatment efficiency.
许多与环境相关的多/全氟烷基物质（PFAS），包括全氟辛烷磺酸（PFOS）和全氟辛酸（PFOA），在自然环境中以不同的同分异构体（支链和直链）形式存在。PFAS 在环境和水源中的同分异构体分布在很大程度上受污染来源和由其结构差异赋予的不同物理化学性质的控制。例如，与线性类似物相比，PFOS 的支链异构体的反应性相对更强，吸附性相对更低。因此，在水处理过程中，支链和直链 PFAS 的去除率可能会有所不同，因此水源中的同分异构体分布会影响处理过程的整体效率。在本文中，我们强调在设计适当的修复策略时，需要考虑污染基质中 PFAS 的同分异构体分布。我们还总结了影响 PFAS 异构体检测、归宿、毒代动力学和处理效率的理化性质的已知出现和变化。
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