Sorption behaviour of per- and polyfluoroalkyl substances (PFASs) in tropical soils

Danielle P. Oliver, Yasong Li, Ryan Orr, Paul Nelson, Mary Barnes, Michael J. McLaughlin, Rai S. Kookana

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    The sorption behaviour of three perfluoroalkyl substances (PFASs), namely perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA) and perfluorohexane sulfonic acid (PFHxS), was determined on 28 tropical soils. Tropical soils are often highly weathered, richer in sesquioxides than temperate soils and may contain variable charge minerals. There are little data on sorption of PFASs in tropical soils. The highest Kd values were found for PFOS with mean values ranging from 0 to 31.6 L/kg. The Kd values for PFOA and PFHxS ranged from 0 to 4.9 L/kg and from 0 to 5.6 L/kg, respectively. While these values are in the range of literature sorption data, the average Kd values for PFOS and PFOA from the literature were 3.7 times and 3.6 times higher, respectively, than those measured in this study. Stepwise regression analysis did explain some of the variance, but with different explanatory variables for the different PFASs. The main soil properties explaining sorption for PFOS and PFOA were oxalate-extractable Al and pH, and for PFHxS was pH.
    Original languageEnglish
    Article number113726
    Number of pages8
    JournalEnvironmental pollution (Barking, Essex : 1987)
    Volume258
    Early online date5 Dec 2019
    DOIs
    Publication statusPublished - Mar 2020

    Keywords

    • PFOS
    • PFOA
    • PFHxS
    • Sorption
    • Tropical soils
    • Weathered soils

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