Cited by 289Per- and polyfluoroalkyl substances researchEnvironmental Chemistry and AnalysisPesticide and Herbicide Environmental Studies

Sorption of perfluoroalkyl substances (PFASs) to an organic soil horizon - effect of cation composition and pH

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Campos Pereira, Hugo, Ullberg, Malin, Kleja, Dan Berggren, Gustafsson, Jon Petter, Ahrens, Lutz·2018·Chemosphere

Abstract

Accurate prediction of the sorption of perfluoroalkyl substances (PFASs) in soils is essential for environmental risk assessment. We investigated the effect of solution pH and calculated soil organic matter (SOM) net charge on the sorption of 14 PFASs onto an organic soil as a function of pH and added concentrations of Al 3+ , Ca 2+ and Na + . Often, the organic C-normalized partitioning coefficients ( K OC ) showed a negative relationship to both pH (Δlog K OC /ΔpH = −0.32 ± 0.11 log units) and the SOM bulk net negative charge (Δlog K OC = −1.41 ± 0.40 per log unit mol c g −1 ). Moreover, perfluorosulfonic acids (PFSAs) sorbed more strongly than perfluorocarboxylic acids (PFCAs) and the PFAS sorption increased with increasing perfluorocarbon chain length with 0.60 and 0.83 log K OC units per CF 2 moiety for C 3 –C 10 PFCAs and C 4 , C 6 , and C 8 PFSAs, respectively. The effects of cation treatment and SOM bulk net charge were evident for many PFASs with low to moderate sorption (C 5 –C 8 PFCAs and C 6 PFSA). However for the most strongly sorbing and most long-chained PFASs (C 9 –C 11 and C 13 PFCAs, C 8 PFSA and perfluorooctane sulfonamide (FOSA)), smaller effects of cations were seen, and instead sorption was more strongly related to the pH value. This suggests that the most long-chained PFASs, similar to other hydrophobic organic compounds, are preferentially sorbed to the highly condensed domains of the humin fraction, while shorter-chained PFASs are bound to a larger extent to humic and fulvic acid, where cation effects are significant.

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Crossref · 10.1016/j.chemosphere.2018.05.012

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  • PFAS sorption mechanisms are influenced by PFAS chain length and solution chemistry (ionic strength, cation valence, pH).

    “All the above sorption mechanisms were also found to be influenced by the PFAS chain length (e.g., Campos-Pereira et al., 2018) and solution chemistry, especially the ionic strength, the valence of cations and the pH (Tang et al., 2010;Brusseau and Van Glubt, 2019;Cai et al., 2022;Lyu and Brusseau, 2020)”

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Authors
Campos Pereira, H., Ullberg, M., Kleja, D. B., Gustafsson, J. P., & Ahrens, L.
Affiliations
Swedish University of Agricultural Sciences (SE)
Venue
Chemosphere
Publisher
Elsevier BV
Published
2018-09
Volume
207
Pages
183-191
ISSN
0045-6535 (ISSN-L)
OpenAlex
W2801726226
Cited by
289
References
52
Citations by year
2026: 39 · 2025: 50 · 2024: 39 · 2023: 40 · 2022: 42 · 2021: 33 · 2020: 28 · 2019: 15 · 2018: 3
FWCI
10.31
Type
journal article
Language
en
Open access
Locations
  • Chemosphere (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
Swedish Research Council (2015-03938)
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
  • Physical Sciences › Environmental Science › Environmental Chemistry › Environmental Chemistry and Analysis
  • Physical Sciences › Environmental Science › Pollution › Pesticide and Herbicide Environmental Studies
Keywords
perfluorinated compounds, PFAS sorption, organic soils, pH effect, cation effects, aluminum, calcium, sodium, partition coefficient, perfluorosulfonic acid, perfluorocarboxylic acids, perfluorooctane sulfonamide, chain length, humin, humic and fulvic acids, soil organic carbon
MeSH terms
Cations, Fluorocarbons, Hydrogen-Ion Concentration, Soil, Water Pollutants, Chemical

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