Cited by 93Per- and polyfluoroalkyl substances researchFluoride Effects and RemovalEnvironmental Chemistry and Analysis

The role of surface charge and pH changes in tropical soils on sorption behaviour of per- and polyfluoroalkyl substances (PFASs)

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Oliver, Danielle P., Li, Yasong, Orr, Ryan, Nelson, Paul, Barnes, Mary, McLaughlin, Michael J., Kookana, Rai S.·2019·Science of The Total Environment

Abstract

This study investigated the effect of surface charge on the sorption of perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA) and perfluorohexane sulfonic acid (PFHxS) onto 7 tropical soils as a function of pH. The net surface charge became less negative with decreasing pH (from 7.5 to 3.5) in all soils. The rate of change in net surface charge varied from -0.6 to -2.8 (cmol/kg)/pH unit. The effect on sorption behaviour of PFASs was variable among soils. For two soils, the average sorption increased 54- and 45-fold for PFOS, 33- and 9-fold for PFOA, and 39- and 400-fold for PFHxS, across the pH range 7.5 to 3.5. Sorption in another sandier soil showed negligible change with decreasing pH. Sorption in the other soils did not change significantly until the pH decreased to approximately 5.5. The soils with high contents of sesquioxides (Fe and Al oxides) showed the most marked increase in sorption with decreasing pH. This study demonstrated that in addition to hydrophobic interactions with OC and other processes, electrostatic interactions are also important in the sorption process for these chemicals in soils. In acidic, variably charged tropical soils there is the possibility that any PFOS, PFOA or PFHxS sorbed to the soils may become desorbed if management practices (e.g. liming) raised soil pH.

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Crossref · 10.1016/j.scitotenv.2019.04.055

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Authors
Oliver, D. P., Li, Y., Orr, R., Nelson, P., Barnes, M., McLaughlin, M. J., & Kookana, R. S.
Affiliations
  • Commonwealth Scientific and Industrial Research Organisation (AU)
  • James Cook University (AU)
  • Flinders University (AU)
  • The University of Adelaide (AU)
Corresponding author
Oliver, Danielle P.
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2019-07
Volume
673
Pages
197-206
ISSN
0048-9697 (ISSN-L)
OpenAlex
W2931524104
Cited by
93
References
38
Citations by year
2026: 20 · 2025: 18 · 2024: 11 · 2023: 12 · 2022: 10 · 2021: 8 · 2020: 11 · 2019: 3
FWCI
3.49
Type
journal article
Language
en
Open access
Locations
  • The Science of The Total Environment (publishedVersion)
  • PubMed (publishedVersion)
  • Flinders Academic Commons (Flinders University) (acceptedVersion, cc-by-nc-nd)
  • Flinders Academic Commons (Flinders University) (acceptedVersion)
  • ResearchOnline - JCU (James Cook University) (submittedVersion)
Funders
CSIRO
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
  • Physical Sciences › Environmental Science › Water Science and Technology › Fluoride Effects and Removal
  • Physical Sciences › Environmental Science › Environmental Chemistry › Environmental Chemistry and Analysis
Keywords
per- and polyfluoroalkyl substances, PFOS, perfluorooctanoic acid, PFHxS, soil sorption, surface charge, pH effect, tropical soils, electrostatic interactions, sesquioxides, iron and aluminum oxides, liming, desorption

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