Sorption and desorption of anionic, cationic and zwitterionic polyfluoroalkyl substances by soil organic matter and pyrogenic carbonaceous materials

Zhi, Yue; Liu, Jinxia

doi:10.1016/j.cej.2018.04.042

Cited by 80 publications

(42 citation statements)

References 44 publications

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“…On the other hand, previous studies have shown that PFSAs are more strongly sorbed than PFCAs to soil and sediments [49][50][51], which might result in lower desorption potential for PFSAs. However, PFOS and PFOA are reported to show similar desorption behavior in soil [52]. In contrast to the two fortified soils, the fraction removed PFASs from the field contaminated soil were lower at all treatment temperatures tested.…”

Section: Resultsmentioning

confidence: 82%

Thermal desorption as a high removal remediation technique for soils contaminated with per- and polyfluoroalkyl substances (PFASs)

2020

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Soils contaminated with per-and polyfluoroalkyl substances (PFASs) are an important source for impacting drinking water delivery systems and surface water bodies worldwide , posing an urgent risk to human health and environmental quality. However, few treatment techniques have been tested for PFAS-contaminated soil hotspots. This study investigated the possibility of thermal desorption as a possible technique to remediate soils contaminated with multiple PFASs. Two fortified soils (∑ 9 PFAS � 4 mg kg-1) and one field-contaminated soil (∑ 9 PFAS � 0.025 mg kg-1) were subjected to a 75-min thermal treatment at temperatures ranging from 150 to 550˚C. Soil concentrations of PFASs showed a significant decrease at 350˚C, with the ∑ 9 PFAS concentration decreasing by, on average, 43% and 79% in the fortified and field contaminated soils, respectively. At 450˚C, >99% of PFASs were removed from the fortified soils, while at 550˚C the fraction removed ranged between 71 and 99% for the field contaminated soil. In the field contaminated soil, PFAS classes with functional groups of sulfonates (PFSAs) and sulfonamides (FOSAs) showed higher removal than the perfluoroalkyl carboxylates (PFCAs). Thus thermal desorption has the potential to remove a wide variety of PFASs from soil, although more studies are needed to investigate the cost-effectiveness, creation of transformation products, and air-phase vacuum filtration techniques.

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Section: Resultsmentioning

confidence: 82%

Thermal desorption as a high removal remediation technique for soils contaminated with per- and polyfluoroalkyl substances (PFASs)

2020

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“…At least 4700 PFAS have been used in industrial and commercial processes and thus potentially released to the environment [3,43]. PFAS include anionic, cationic, zwitterionic, and neutral compound groups with a range of functional groups (e.g., carboxylic acid, sulfonic acid, ether sulfonate, sulfonamide, sulfonamido acetic acid, phosphate diester, acrylate, amido ammonium salt, amido betaine, and others) [44,45]. In addition, for a given PFAS, there can be multiple isomers depending on the manufacturing process, e.g., PFOS produced from an electrochemical fluorination process yields multiple branched isomers in addition to the linear isomer [5].…”

Section: The Expanding List Of Pfasmentioning

confidence: 99%

Sources, Fate, and Plant Uptake in Agricultural Systems of Per- and Polyfluoroalkyl Substances

Costello

Lee

2020

Curr Pollution Rep

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Purpose of Review Per- and polyfluoroalkyl substances (PFAS) are a family of > 4700 recalcitrant compounds, many of which are ubiquitous in the environment. This review aims to (1) identify PFAS sources and fate processes relevant to agricultural systems and (2) expand on plant uptake mechanisms and plant responses to PFAS. Recent Findings The number of PFAS being quantified in studies involving soil, water, and plants is increasing. Transformation of precursors that tend to stay in the rhizosphere can lead to long-term PFAS reservoir to plants. Some PFAS are readily taken up, particularly the shorter-chain PFAS, and can evoke metabolic responses and phytotoxic effects at high concentrations. PFAS translocation from roots to shoots occurs through both active and passive transport mechanisms. Both PFAS uptake and effects vary between and within species. Summary As new PFAS emerge, it will be necessary to continue expanding the list of PFAS quantified in land-applied media and assessing their accumulation potential in plants. While controlled laboratory or greenhouse studies have merit, comprehensive field studies are needed to provide clarity on PFAS fate and their relative risk in agricultural systems. Field studies should include identifying site-specific PFAS sources, quantifying a broader suite of PFAS and identifying potential precursors, evaluating plant uptake of replacement PFAS, reporting of soil properties and climatic conditions, and assessing risk of impacts to source and irrigation waters. This information can be utilized to inform future studies towards evaluating and mitigating risks to our food chain associated with PFAS in agricultural systems.

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“…The techniques efficiency on multiple PFASs, chain lengths and functional groups, is crucial for the techniques environmental relevance because the vast number of PFAS homologues with over 4700 on the global market (Boston et al, 2019), and variety of anionic, cationic, zwitterionic and neutral PFAS found in e.g. AFFFs (Baduel et al, 2015;Barzen-Hanson et al, 2017;Munoz et al, 2018;Zhi and Liu, 2018).…”

Section: Mass Balance Distribution Of Pfass In the Electrodialytic Systemmentioning

confidence: 99%

Electrodialytic per- and polyfluoroalkyl substances (PFASs) removal mechanism for contaminated soil

et al. 2019

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Contamination of soils with per-and polyfluoroalkyl substances (PFASs) is a global problem, in particular at fire-fighter training sites due to the usage of PFAS-containing aqueous fire-fighting foams (AFFFs). In this study, an electrodialytic remediation method was applied for the first time to remove PFASs from contaminated soil. The electrodialytic remediation system was evaluated in a laboratoryscale experiment with current densities of 0.19 mA cm -2 and 0.38 mA cm -2 over 21 days, using PFAScontaminated soil from a fire-fighter training site at Stockholm Arlanda Airport, Sweden. Of the 23 PFASs targeted, significant (p<0.05) PFAS electromigration towards the anode was observed for C3-C7 perfluoroalkyl carboxylates (PFCAs) (PFBA, PFPeA, PFHxA, PFOA) and C4, C6, and C8 perfluoroalkane sulfonates (PFSAs) (PFBS, PFHxS, PFOS) since these PFASs were predominantly negatively charged. In contrast to the electromigration of the charged PFASs, N-methyl perfluorooctane sulfonamide (MeFOSA), perfluorooctane sulfonamidoacetic acid (FOSAA) and ethyl FOSAA (EtFOSAA) showed significant (p<0.05) transport towards the cathode, which is probably attributed due to electro-osmotic flow of these predominantly neutral PFASs. Mass balance calculations showed that for the shortestchained PFASs (i.e., PFBA, PFPeA, PFHxA, PFBS, and PFHxS), up to 20% was extracted from the soil to the anolyte, which showed that electrodialytic is a possible in-situ remediation technique for PFAScontaminated soil.

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Sorption and desorption of anionic, cationic and zwitterionic polyfluoroalkyl substances by soil organic matter and pyrogenic carbonaceous materials

Cited by 80 publications

References 44 publications

Thermal desorption as a high removal remediation technique for soils contaminated with per- and polyfluoroalkyl substances (PFASs)

Thermal desorption as a high removal remediation technique for soils contaminated with per- and polyfluoroalkyl substances (PFASs)

Sources, Fate, and Plant Uptake in Agricultural Systems of Per- and Polyfluoroalkyl Substances

Electrodialytic per- and polyfluoroalkyl substances (PFASs) removal mechanism for contaminated soil

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