Application of soil amendments for reducing PFAS leachability and bioavailability

Albert L. Juhasz, Farzana Kastury, Carina Herde, Wayne Tang

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, changes in PFAS leachability and bioavailability were determined following the application of RemBind®100 (R100) and RemBind®300 (R300; 1–10% w/w) to PFAS-contaminated soil (Ʃ28 PFAS 3.093–32.78 mg kg−1). Small differences were observed in PFAS immobilization efficacy when soil was amended with RemBind® products although adding 5% w/w of either product resulted in a >98% reduction in ASLP PFAS leachability. Variability in immobilization efficacy was attributed to differences in activated carbon composition which influenced physicochemical properties of RemBind® formulations and PFAS sorption. PFOS, PFHxS and PFOA relative bioavailability was also assessed in unamended and amended soil (5% w/w) using an in vivo mouse model. In unamended soil, PFAS relative bioavailability was >60% with differences attributed to physicochemical properties of soil which influenced electrostatic and hydrophobic interactions. However, when PFAS relative bioavailability was assessed in soil amended with 5% w/w R100, individual PFAS relative bioavailability was reduced to 16.1 ± 0.8% to 26.1 ± 0.9% with similar results observed when R300 (5% w/w) was utilised (14.4 ± 1.6% to 24.3 ± 0.8%). Results from this study highlight that soil amendments have the potential to reduce both PFAS leachability and relative bioavailability thereby decreasing mobility and potential exposure to soil-borne contaminants.

Original languageEnglish
Article number119498
JournalEnvironmental Pollution
Volume307
DOIs
Publication statusPublished or Issued - 15 Aug 2022

Keywords

  • Bioavailability
  • Immobilization
  • Leachability
  • PFAS
  • Soil amendments

ASJC Scopus subject areas

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis

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