Cited by 86Per- and polyfluoroalkyl substances researchEnvironmental Chemistry and AnalysisSurfactants and Colloidal Systems

The Influence of Molecular Structure on PFAS Adsorption at Air-Water Interfaces in Electrolyte Solutions

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Brusseau, Mark L., Van Glubt, Sarah·2021·Chemosphere

Abstract

Fluid-fluid interfacial adsorption has been demonstrated to be an important retention process for per and polyfluoroalkyl substances (PFAS) in porous media with air or non-aqueous phase liquids (NAPLs) present. The objective of this study was to characterize the influence of PFAS molecular structure on air-water interfacial adsorption in electrolyte solutions. Measured and literature-reported surface-tension data sets were aggregated to generate the largest compilation of interfacial adsorption coefficients measured in aqueous solutions comprising environmentally representative ionic strengths. The surface activities and interfacial adsorption coefficients (K i) exhibited chain length trends, with greater surface activities and larger K i values corresponding to longer chain length. The impact of multiple-component PFAS solutions on the surface activity of a select PFAS was a function of the respective surface activities and concentrations. Quantitative structure-property relationship analysis (QSPR) employing a single molecular descriptor (molar volume) was used successfully to characterize the impact of PFAS molecular structure on air-water interfacial adsorption. A previously reported QSPR model based on PFAS data generated for deionized-water solutions was updated to include more than 60 different PFAS, comprising all head-group types and a wide variety of tail structures. The QSPR model developed for PFAS in electrolyte solution compared favorably to the model developed for deionized water. Additionally, the magnitude of ionic strength for non-zero ionic strength systems was determined to have relatively minimal impact on interfacial adsorption coefficients. The new QSPR model is therefore anticipated to be representative for a wide variety of PFAS and for a wide range of ionic compositions.

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Crossref · 10.1016/j.chemosphere.2021.130829

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  • For some PFAS, the only available values for physical and chemical properties are estimates derived from mathematical models such as QSAR models.

    “In fact, for some PFAS, the only available values for physical and chemical properties are estimates derived from mathematical models, such as quantitative structure–activity relationship (QSAR) models [18], which can approximate the chemical and physical properties of compounds based on their chemical structure, rather values from direct measurements [19,20].”

    From The EU’s Per- and Polyfluoroalkyl Substances (PFAS) Ban: A Case of Policy over Science (2023) · cites this paper as [19]

    The Introduction (page not provided) says QSPR models estimate PFAS properties from molecular structure because measuring interfacial adsorption coefficients for thousands of PFAS is impractical. Materials and Methods (page not provided) also describes calculating molar volumes when densities were unavailable. The paper does not establish the broader claim that model estimates are the only available physical and chemical property values for some PFAS. (LLM, conf=0.83)

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Research works printed but not linked: 2

  1. Helyar KR; Porter WM Chapter 2. Soil acidification, its measurement and the processes involved. Soil Acidity and Plant Growth, 1989, Academic Press, San Diego, CA.
  2. Sparks DL Chapter 9. The chemistry of soil acidity. Environmental Soil Chemistry 2nd Edition, 2003, Academic Press, San Diego, CA.

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Authors
Brusseau, M. L., & Van Glubt, S.
Affiliations
University of Arizona (US)
Corresponding author
Brusseau, Mark L.
Venue
Chemosphere
Publisher
Elsevier BV
Published
2021-10
Volume
281
Pages
130829
ISSN
0045-6535 (ISSN-L)
OpenAlex
W3161413551
Cited by
86
References
48
Citations by year
2026: 18 · 2025: 18 · 2024: 19 · 2023: 18 · 2022: 8 · 2021: 5
FWCI
4.74
Type
journal article
Language
en
Open access
Locations
  • Chemosphere (acceptedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Science Foundation Division of Earth Sciences (2023351)
  • National Science Foundation
  • National Institute of Environmental Health Sciences (42 ES 4940)
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
  • Physical Sciences › Environmental Science › Environmental Chemistry › Environmental Chemistry and Analysis
  • Physical Sciences › Chemistry › Organic Chemistry › Surfactants and Colloidal Systems
Keywords
per- and polyfluoroalkyl substances, PFAS, air-water interface, interfacial adsorption, electrolyte solutions, ionic strength, chain length effects, surface activity, surface tension, QSPR, molar volume
MeSH terms
Adsorption, Electrolytes, Fluorocarbons, Surface Tension, Water, Molecular Structure

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