Effect of salinity and sediment characteristics on the sorption and desorption of perfluorooctane sulfonate at sediment-water interface
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This study investigated the influence of solution salinity, pH and the sediment characteristics on the sorption and desorption of perfluorooctane sulfonate (PFOS). The results showed that the sorption of PFOS onto sediment increased by a factor of 3 as the CaCl(2) concentration increased from 0.005 to 0.5 mol L(-1) at pH 7.0, and nearly 6 at pH 8.0. Desorption hysteresis occurred over all salinity. The thermodynamic index of irreversibility (TII) values increased with increasing concentration of CaCl(2). Maximum irreversibility was found in the sorption systems with CaCl(2) in the concentration of 0.5 mol L(-1). The results suggested that PFOS can be largely removed from the water with increasing salinity, and get trapped onto sediments irreversibly. These phenomena could be explained by salting-out effect and Ca-bridging effect. Studies also suggested that the content of total organic carbon is the dominant psychochemical properties of sediment controlling the sorption of PFOS.
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Higher concentrations of divalent cations like Ca2+ in more saline waters may contribute to neutralizing the negative charge and reducing electrostatic repulsion on the particle surface.
“higher concentration of divalent cations like Ca2+ in more saline waters may contribute to neutralizing the negative charge and reduce the electrostatic repulsion on the particle surface (You et al., 2010).”
From Partitioning behavior of short-chain legacy and novel perfluorinated substances (PFAS) between dissolved and particulate phases in a river-estuary-coast continuum (2025) · cites this paper as You et al., 2010
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- Authors
- You, C., Jia, C., & Pan, G.
- Affiliations
- Chinese Academy of Sciences (CN)
- Corresponding author
- Pan, Gang
- ORCID
- Pan, Gang
- Venue
- Environmental Pollution
- Publisher
- Elsevier BV
- Published
- 2010-05
- Volume
- 158
- Issue
- 5
- Pages
- 1343-1347
- ISSN
- 0269-7491 (ISSN-L)
- OpenAlex
- W2154651666
- Cited by
- 313
- References
- 3
- Citations by year
- 2026: 23 · 2025: 35 · 2024: 27 · 2023: 26 · 2022: 28 · 2021: 25 · 2020: 18 · 2019: 16 · 2018: 20 · 2017: 13 · 2016: 10 · 2015: 18 · 2014: 15 · 2013: 13 · 2012: 16
- FWCI
- 10.18
- Type
- journal article
- Language
- en
- Open access
- green
- ir.rcees.ac.cn
- Licence
- cc-by-nc-nd
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
- Locations
- Environmental Pollution (publishedVersion)
- PubMed (publishedVersion)
- Research Center for Eco-Environmental Sciences OpenIR (Chinese Academy of Sciences) (submittedVersion, cc-by-nc-nd)
- Nottingham Trent University's Institutional Repository (Nottingham Trent Repository) (submittedVersion)
- Funders
- CAS project (KJCX2.YW.H04)
- National Natural Science Foundation of China (20621703)
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
- Physical Sciences › Environmental Science › Environmental Chemistry › Environmental Chemistry and Analysis
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Toxic Organic Pollutants Impact
- Keywords
- PFOS, desorption hysteresis, salinity effects, calcium chloride, pH effect, sediment-water interface, salting-out, calcium bridging, total organic carbon, sediment characteristics
- MeSH terms
- Adsorption, Fluorocarbons, Hydrogen-Ion Concentration, Water Pollutants, Chemical, Alkanesulfonic Acids, Geologic Sediments, Environmental Restoration and Remediation
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