Mechanism and implication of the sorption of perfluorooctanoic acid by varying soil size fractions
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 K oc values.
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K_d decreases along the sequence: clay > fine silt > coarse silt > fine sand > coarse sand for PFOA sorption on various soil size fractions.
“a study of PFOA sorption on various soil size fractions confirmed that K d decreases along the sequence: clay > fine silt > coarse silt > fine sand > coarse sand (Xiang et al., 2018).”
From Modelling the sorption behaviour of perfluoroalkyl carboxylates and perfluoroalkane sulfonates in soils (2021) · cites this paper as Xiang et al., 2018
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- Authors
- Xiang, L., Xiao, T., Yu, P.-F., Zhao, H.-M., Mo, C.-H., Li, Y.-W., Li, H., Cai, Q.-Y., Zhou, D.-M., & Wong, M.-H.
- Affiliations
- Jinan University (CN)
- Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
- Corresponding author
- Mo, Ce-Hui
- ORCID
- Venue
- Journal of Agricultural and Food Chemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-09-21
- Volume
- 66
- Issue
- 44
- Pages
- 11569-11579
- ISSN
- 0021-8561 (ISSN-L)
- 1520-5118
- OpenAlex
- W2892195746
- Cited by
- 67
- References
- 47
- Citations by year
- 2026: 5 · 2025: 11 · 2024: 11 · 2023: 12 · 2022: 9 · 2021: 7 · 2020: 7 · 2019: 5
- FWCI
- 2.48
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Agricultural and Food Chemistry (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Guangdong Science and Technology Department (2016B020242005, 2017B020238002)
- China Postdoctoral Science Foundation (2017M612844)
- National Natural Science Foundation of China (41573093, 41807339, U1501233)
- Natural Science Foundation of Guangdong Province (2016A030312009)
- Guangzhou City (201704020074)
- Water Affairs Bureau of Guangzhou Municipality (GZCPJ/YB-2016-15)
- Guangdong Province (U1501233)
- State Key Laboratory of Organic Geochemistry (SKLOG-201724)
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
- Physical Sciences › Environmental Science › Pollution › Pesticide and Herbicide Environmental Studies
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Toxic Organic Pollutants Impact
- Keywords
- perfluorooctanoic acid, soil size fractions, film diffusion, intraparticle diffusion, organic matter, cation exchange capacity, pore volume, humic acid, clay, sorption isotherms, hydrophobic forces, soil mobility, bioavailability, persistent organic pollutants, agricultural soils
- MeSH terms
- Adsorption, Caprylates, Fluorocarbons, Humic Substances, Kinetics, Particle Size, Pesticides, Soil, Soil Pollutants
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