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Influence of Residual Nonaqueous-Phase Liquids (NAPLs) on the Transport and Retention of Perfluoroalkyl Substances
Abstract
Per- and polyfluoralkyl substances (PFAS) are known to accumulate at interfaces, and the presence of nonaqueous-phase liquids (NAPLs) could influence the PFAS fate in the subsurface. Experimental and mathematical modeling studies were conducted to investigate the effect of a representative NAPL, tetrachloroethene (PCE), on the transport behavior of PFAS in a quartz sand. Perfluorooctanesulfonate (PFOS), perfluorononanoic acid (PFNA), a 1:1 mixture of PFOS and PFNA, and a mixture of six PFAS (PFOS, PFNA, perfluorooctanoic acid (PFOA), perfluoroheptanoic acid (PFHpA), perfluorohexanesulfonate (PFHxS), and perfluorobutanesulfonate (PFBS)) were used to assess PFAS interactions with PCE-NAPL. Batch studies indicated that PFAS partitioning into PCE-NAPL ( K nw < 0.1) and adsorption on 60–80 mesh Ottawa sand ( K d < 6 × 10 –5 L/g) were minimal. Column studies demonstrated that the presence of residual PCE-NAPL (∼16% saturation) delayed the breakthrough of PFOS and PFNA, with minimal effects on the mobility of PFBS, PFHpA, PFHxS, and PFOA. Breakthrough curves (BTCs) obtained for PFNA and PFOS alone and in mixtures were nearly identical, indicating the absence of competitive adsorption effects. A mathematical model that accounts for NAPL–water interfacial sorption accurately reproduced PFAS BTCs, providing a tool to predict PFAS fate and transport in co-contaminated subsurface environments.
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Metadata
- Authors
- Liao, S., Arshadi, M., Woodcock, M. J., Saleeba, Z. S. S. L., Pinchbeck, D., Liu, C., Cápiro, N. L., Abriola, L. M., & Pennell, K. D.
- Affiliations
- Brown University (US)
- Tufts University (US)
- Auburn University (US)
- Corresponding author
- Pennell, Kurt D.
- ORCID
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2022-06-08
- Volume
- 56
- Issue
- 12
- Pages
- 7976-7985
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W4282936938
- Semantic Scholar
- 004d8cfe12be000264fcc9ad5315d51323993d25
- Cited by
- 39
- References
- 49
- Citations by year
- 2026: 9 · 2025: 11 · 2024: 11 · 2023: 8
- FWCI
- 2.42
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Environmental Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- U.S. Army Corps of Engineers (W912HQ-18-C-0014, W912HQ-18-C0002)
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
- Physical Sciences › Environmental Science › Environmental Engineering › Groundwater flow and contamination studies
- Physical Sciences › Environmental Science › Environmental Engineering › Environmental remediation with nanomaterials
- Keywords
- non-aqueous phase liquids, tetrachloroethylene, PFOS, PFNA, PFAS transport, competitive adsorption, breakthrough curves, subsurface contamination, co-contamination, adsorption, partitioning, quartz sand
- MeSH terms
- Sand, Adsorption, Environmental Pollutants, Fluorocarbons, Water, Alkanesulfonic Acids
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