Mechanism and implication of the sorption of perfluorooctanoic acid by varying soil size fractions

Lei XIANG, Tao XIAO, Peng-Fei YU, Hai-Ming ZHAO, Ce-Hui MO, Yan-Wen LI, Hui LI, Quan-Ying CAI, Dong-Mei ZHOU, Ming Hung WONG

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10 Citations (Scopus)

Abstract

Sorption of perfluorooctanoic acid (PFOA), a toxic and persistent organic pollutant, by various size fractions of an agricultural soil at environmentally relevant concentrations was evaluated. PFOA sorption to all fractions involved both film diffusion and intraparticle diffusion with the rate-limiting step by the latter. PFOA isotherm data fitted a linear model. Organic matter (OM), cation exchange capacity, pore volume, and the Brunauer–Emmett–Teller area played key roles in PFOA sorption. The sorption capacity followed the order of humic acid > clay (0.15–4.4 mm) > fine silt (1.9–39.8 mm) > coarse silt (17.3–79.4 mm) > fine sand (45.7–316.2 mm) > coarse sand (120–724.4 mm), opposite to their contributions to overall PFOA sorption due to the influence of their percentage weight in the original soil. Percentage OM content was the dominant factor controlling the fraction contributions to overall PFOA sorption, demonstrating influence of the hydrophobic force on sorption. PFOA should be highly mobile and bioavailable in soil-crop systems due to the low log Koc values. Copyright © 2018 American Chemical Society.
Original languageEnglish
Pages (from-to)11569-11579
JournalJournal of Agricultural and Food Chemistry
Volume66
Issue number44
Early online dateSep 2018
DOIs
Publication statusPublished - Nov 2018

Citation

Xiang, L., Xiao, T., Yu, P.-F., Zhao, H.-M., Mo, C.-H., Li, Y.-W., . . . Wong, M.-H. (2018). Mechanism and implication of the sorption of perfluorooctanoic acid by varying soil size fractions. Journal of Agricultural and Food Chemistry, 66(44), 11569-11579. doi: 10.1021/acs.jafc.8b03492

Keywords

  • Agricultural soil
  • Implication
  • Mechanism
  • Particle-size fractions
  • Perfluorooctanoic acid (PFOA)
  • Sorption

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