A group-contribution model for predicting the physicochemical behavior of PFAS components for understanding environmental fate

Le, Song-Thao; Kibbey, Tohren C.G.; Weber, Kela P.; Glamore, William; O'Carroll, D. M.

doi:10.1016/j.scitotenv.2020.142882

Cited by 37 publications

(29 citation statements)

References 54 publications

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“…21 Like PFOA, retardation of 6:2 FTS was less than for PFOS, which is consistent with greater contributions of CF 2 groups, in comparison to CH 2 groups, to surface activity. 55 Based on the retardation of PFOA, the specific air−water interfacial area was estimated to be 2650 ± 110 m −1 , which is consistent with previous studies at higher water saturations. 51,56 This area is much smaller than those measured at lower water saturations 18,50,56 and the retardation factors are correspondingly smaller.…”

Section: Single-component Pfas Experimentssupporting

confidence: 89%

Retention of PFOS and PFOA Mixtures by Trapped Gas Bubbles in Porous Media

Abraham

Mumford

Patch

et al. 2022

Environ. Sci. Technol.

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The transport of per-and polyfluoroalkyl substances (PFAS) in soil and groundwater is important for site investigation, risk characterization, and remediation planning. The adsorption of PFAS at air−water interfaces has been shown to significantly contribute to PFAS retention, with subsequent effects on concentrations and the time scales of transport. In this study, column experiments were conducted to investigate the transport of perfluorooctanesulfonic acid (PFOS), perfluorooctanoic acid (PFOA), and 6:2 fluorotelomer sulfonate (6:2 FTS) individually and in binary mixtures in the presence of a trapped gas phase, using clean sands to isolate adsorption to air−water interfaces. Consistent with previous studies, the transport of PFOS, PFOA, and 6:2 FTS was retarded by adsorption at the air−water interface, with greater retention of PFOS due to its higher affinity for the air−water interface. Chromatographic separation occurred in the experiments using binary mixtures of PFOS and PFOA, with greater retention at lower influent concentrations. The mixture experiments also showed enhanced breakthrough of PFOA in the presence of PFOS, where effluent concentrations of PFOA were temporarily greater than the influent concentration prior to the breakthrough of PFOS. This enhanced breakthrough was attributed to competition between PFOS and PFOA for adsorption to the air−water interface.

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Section: Single-component Pfas Experimentssupporting

confidence: 89%

Retention of PFOS and PFOA Mixtures by Trapped Gas Bubbles in Porous Media

Abraham

Mumford

Patch

et al. 2022

Environ. Sci. Technol.

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“…It is well known that some PFAS subgroups such as ionic PFAAs with short carbon chain length are highly water-soluble and can partition at the water-air interface [103][104][105], while longer chain PFAs (C ≥ 6) and PFCAs (C ≥ 8) tend to be distributed into the watersediment fraction and biota [106][107][108] (see Figure 3). For this reason, significant amounts of these compounds are constantly detected in a large number of water bodies and aquifers.…”

Section: Pfas Occurrence In the Aquatic Systemsmentioning

confidence: 99%

PFAS Molecules: A Major Concern for the Human Health and the Environment

Panieri

Baralić

Đukić-Ćosić

et al. 2022

Toxics

194

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Per- and polyfluoroalkyl substances (PFAS) are a group of over 4700 heterogeneous compounds with amphipathic properties and exceptional stability to chemical and thermal degradation. The unique properties of PFAS compounds has been exploited for almost 60 years and has largely contributed to their wide applicability over a vast range of industrial, professional and non-professional uses. However, increasing evidence indicate that these compounds represent also a serious concern for both wildlife and human health as a result of their ubiquitous distribution, their extreme persistence and their bioaccumulative potential. In light of the adverse effects that have been already documented in biota and human populations or that might occur in absence of prompt interventions, the competent authorities in matter of health and environment protection, the industries as well as scientists are cooperating to identify the most appropriate regulatory measures, substitution plans and remediation technologies to mitigate PFAS impacts. In this review, starting from PFAS chemistry, uses and environmental fate, we summarize the current knowledge on PFAS occurrence in different environmental media and their effects on living organisms, with a particular emphasis on humans. Also, we describe present and provisional legislative measures in the European Union framework strategy to regulate PFAS manufacture, import and use as well as some of the most promising treatment technologies designed to remediate PFAS contamination in different environmental compartments.

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“…Moreover, being shorter than PFOS, PFOA has been reported to show a higher tendency to stay in the aqueous phase, and therefore is difficult to precipitate out. 24 With AN (NH 4 NO 3 ), no such precipitation was observed, and NMR results also confirm no detectable interaction between AN and PFOS (Fig. S14 and S15 † ).…”

mentioning

confidence: 62%