Key properties governing sorption–desorption behaviour of poly- and perfluoroalkyl substances in saturated and unsaturated soils: a review

Kookana, Rai S.; Navarro, Divina A.; Kabiri, Shervin; McLaughlin, Mike J.

doi:10.1071/sr22183

Cited by 21 publications

(5 citation statements)

References 70 publications

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“…The non-extractable PFAS determined by methanol extraction ranged from 62% (PFOS in the sandy soil) to 89% (PFBA in the brown soil), similar to the PFAS retention trend in a soil column study . For a given PFAS, the non-extractable fraction was in the order of brown soil > loamy soil > black soil > sandy soil, implying that soil properties are important factors that control their distribution in soils. , …”

Section: Resultssupporting

confidence: 63%

“…39 For a given PFAS, the non-extractable fraction was in the order of brown soil > loamy soil > black soil > sandy soil, implying that soil properties are important factors that control their distribution in soils. 40,41 Although dosed at the same concentrations for these four soils, C d and C s for all of the PFAS differed. C d of PFAS decreased with increased carbon chain lengths for the three perfluoroalkyl carboxylic acids (PFCAs) and the two perfluoroalkyl sulfonic acids (PFSAs).…”

Section: Pfas In Soilsmentioning

confidence: 95%

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In Situ Insight into the Availability and Desorption Kinetics of Per- and Polyfluoroalkyl Substances in Soils with Diffusive Gradients in Thin Films

Huang

Liu

et al. 2023

Environ. Sci. Technol.

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The physicochemical exchange dynamics between the solid and solution phases of per-and polyfluoroalkyl substances (PFAS) in soils needs to be better understood. This study employed an in situ tool, diffusive gradients in thin films (DGT), to understand the distribution and exchange kinetics of five typical PFAS in four soils. Results show a nonlinear relationship between the PFAS masses in DGT and time, implying that PFAS were partially supplied by the solid phase in all of the soils. A dynamic model DGT-induced fluxes in soils/sediments (DIFS) was used to interpret the results and derive the distribution coefficients for the labile fraction (K dl ), response time (t c ), and adsorption/desorption rates (k 1 and k −1 ). The larger labile pool size (indicated by K dl ) for the longer chain PFAS implies their higher potential availability. The shorter chain PFAS tend to have a larger t c and relatively smaller k −1 , implying that the release of these PFAS in soils might be kinetically limited but not for more hydrophobic compounds, such as perfluorooctanesulfonic acid (PFOS), although soil properties might play an important role. K dl ultimately controls the PFAS availability in soils, while the PFAS release from soils might be kinetically constrained (which may also hold for biota uptake), particularly for more hydrophilic PFAS.

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Section: Resultssupporting

confidence: 63%

Section: Pfas In Soilsmentioning

confidence: 95%

In Situ Insight into the Availability and Desorption Kinetics of Per- and Polyfluoroalkyl Substances in Soils with Diffusive Gradients in Thin Films

Huang

Liu

et al. 2023

Environ. Sci. Technol.

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show abstract

Section: Introductionmentioning

confidence: 99%

“…For example, PFAS of highest concern to date, such as perfluorooctanesulfonate (PFOS) and carboxylate (PFOA) and many of their industrial substitutes, are anionic. Capturing sorption and partition properties for legacy, emerging, and premarket anionic PFAS is a prerequisite for their environmental fate assessment 15 but is not possible by using K ow for the reasons stated above. Recently, de Voogt et al 16,17 proposed isocratic reversedphase liquid chromatography (LC) retention (or capacity) factors (k) measured with an octadecyl group bonded silica (C 18 ) column as a hydrophobicity indicator for fluorinated and nonfluorinated anionic surfactants.…”

Section: ■ Introductionmentioning

confidence: 99%

Hydrophobic Sorption Properties of an Extended Series of Anionic Per- and Polyfluoroalkyl Substances Characterized by C₁₈ Chromatographic Retention Measurement

Endo,

Matsuzawa

2024

Environ. Sci. Technol.

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Partitioning from water to nonaqueous phases is an important process that controls the behavior of contaminants in the environment and biota. However, for ionic chemicals including many perfluoroalkyl and polyfluoroalkyl substances (PFAS), environmentally relevant partition coefficients cannot be predicted using the octanol/water partition coefficient, which is commonly used as a hydrophobicity indicator for neutral compounds. As an alternative, this study measured C 18 liquid chromatography retention times of 39 anionic PFAS and 20 nonfluorinated surfactants using isocratic methanol/water eluent systems. By measuring a series of PFAS with different perfluoroalkyl chain lengths, retention factors at 100% water (k 0 ) were successfully extrapolated even for long-chain PFAS. Molecular size was the most important factor determining the k 0 of PFAS and non-PFAS, suggesting that the cavity formation process is the key driver for retention. Log k 0 showed a high correlation with the log of partition coefficients from water to the phospholipid membrane, air/water interface, and soil organic carbon. The results indicate the potential of C 18 retention factors as predictive descriptors for anionic PFAS partition coefficients and the possibility of developing a more comprehensive multiparameter model for the partitioning of anionic substances in general.

show abstract

Section: Introductionmentioning

confidence: 99%

Hydrophobic Sorption Properties of an Extended Series of Anionic Per- and Polyfluoroalkyl Substances Characterized by C18 Chromatographic Retention Measurement

Endo,

Matsuzawa

2024

Preprint

View full text Add to dashboard Cite

Partitioning from water to nonaqueous phases is an important process that controls the behavior of contaminants in the environment and biota. However, for ionic chemicals including many per- and polyfluoroalkyl substances (PFAS), environmentally relevant partition coefficients cannot be predicted using the octanol/water partition coefficient, which is commonly used as a hydrophobicity indicator for neutral compounds. As an alternative, this study measured C18 liquid chromatography retention times of 39 anionic PFAS and 20 nonfluorinated surfactants using isocratic methanol/water eluent systems. By measuring a series of PFAS with different perfluoroalkyl chain lengths, retention factors at 100% water (k0) were successfully extrapolated even for long-chain PFAS. Molecular size was the most important factor determining the k0 of PFAS and non-PFAS, suggesting that the cavity formation process is the key driver for retention. The log k0 showed a high correlation with the log of partition coefficients from water to phospholipid membrane, air/water interface, and soil organic carbon. The results indicate the potential of C18 retention factors as a predictive descriptor for anionic PFAS partition coefficients and the possibility of developing a more comprehensive multiparameter model for partitioning of anionic substances in general.

show abstract

Key properties governing sorption–desorption behaviour of poly- and perfluoroalkyl substances in saturated and unsaturated soils: a review

Cited by 21 publications

References 70 publications

In Situ Insight into the Availability and Desorption Kinetics of Per- and Polyfluoroalkyl Substances in Soils with Diffusive Gradients in Thin Films

In Situ Insight into the Availability and Desorption Kinetics of Per- and Polyfluoroalkyl Substances in Soils with Diffusive Gradients in Thin Films

Hydrophobic Sorption Properties of an Extended Series of Anionic Per- and Polyfluoroalkyl Substances Characterized by C₁₈ Chromatographic Retention Measurement

Hydrophobic Sorption Properties of an Extended Series of Anionic Per- and Polyfluoroalkyl Substances Characterized by C18 Chromatographic Retention Measurement

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