The influence of solution chemistry on air-water interfacial adsorption and transport of PFOA in unsaturated porous media

Lyu, Ying; Brusseau, Mark L.

doi:10.1016/j.scitotenv.2020.136744

Cited by 66 publications

(77 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…That is, increased salinity enhances the retention of certain organic compounds on the solid matrix. Similarly, the ionic strength of groundwater has been observed to impact PFAS sorption (Brusseau et al 2019;Silva et al 2019;Li et al 2020;Lyu and Brusseau 2020). Several researchers have reported the salting out of PFAS in estuarine systems as freshwater PFAS plumes mix with salt water, resulting in increased plume salinity and increased sorption of PFAS to solids, with a commensurate decrease in the aqueous phase concentrations.…”

Section: Pfas Salting Outmentioning

confidence: 99%

Monitored Natural Attenuation to Manage PFAS Impacts to Groundwater: Scientific Basis

Newell¹,

Adamson²,

Kulkarni³

et al. 2021

Groundwater Monitoring Rem

View full text Add to dashboard Cite

This column reviews the general features of PHT3D Version 2, a reactive multicomponent transport model that couples the geochemical modeling software PHREEQC-2 (Parkhurst and Appelo 1999) with three-dimensional groundwater flow and transport simulators MODFLOW-2000 and MT3DMS (Zheng and Wang 1999). The original version of PHT3D was developed by Henning Prommer and Version 2 by Henning Prommer and Vincent Post (Prommer and Post 2010). More detailed information about PHT3D is available at the website http://www.pht3d.org.The review was conducted separately by two reviewers. This column is presented in two parts.

show abstract

Section: Pfas Salting Outmentioning

confidence: 99%

Monitored Natural Attenuation to Manage PFAS Impacts to Groundwater: Scientific Basis

Newell¹,

Adamson²,

Kulkarni³

et al. 2021

Groundwater Monitoring Rem

View full text Add to dashboard Cite

show abstract

“…The majority of prior laboratory research on PFAS transport in porous media has focused on the contributions of solid-phase sorption (e.g., refs − ) and air–water interfacial adsorption. − However, additional retention processes may occur in NAPL-contaminated source zones, including partitioning into bulk NAPL and adsorption at NAPL–water interfaces. ,− McKenzie et al conducted miscible-displacement column experiments to investigate the impacts of TCE NAPL on the transport of a suite of PFAS in a loamy sand. Increased PFAS retention was observed in the presence of residual NAPL.…”

Section: Introductionmentioning

confidence: 99%

Contribution of Nonaqueous-Phase Liquids to the Retention and Transport of Per and Polyfluoroalkyl Substances (PFAS) in Porous Media

Glubt

Brusseau

2021

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Per and polyfluoroalkyl substances (PFAS) cocontamination with nonaqueous-phase organic liquids (NAPLs) has been observed or suspected at various sites, particularly at fire-training areas at which aqueous film-forming foams (AFFFs) were applied. The objectives of this study are to (1) delineate the relative significance of specific PFAS-NAPL processes on PFAS retention, including partitioning into the bulk NAPL phase and adsorption to the NAPL–water interface; (2) investigate the influence of NAPL properties, saturation, and mass-transfer constraints on PFAS retention; and (3) determine whether PFAS may impact NAPL distribution through mobilization or dissolution. Perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) are used as representative PFAS, and trichloroethene (TCE) and decane are used as representative NAPLs. NAPL–water interfacial adsorption was quantified with NAPL–water interfacial-tension measurements; partitioning into NAPL was quantified with batch experiments, and retardation factors (R) in the absence and presence of residual NAPL were determined with miscible-displacement transport experiments. R values increased in the presence of residual NAPL, with adsorption to the NAPL–water interface accounting for as much as ∼77% of retention and solid-phase adsorption also significantly contributing to retention. Additionally, this study provides the first QSPR analysis focused on NAPL–water interfacial adsorption coefficients, with results consistent with those from previous air–water studies. Lastly, this initial investigation into PFAS impacts on NAPL behavior determined that PFOS/PFOA are unlikely to enhance solubilization or mobilization of NAPL under the conditions present at many AFFF legacy sites.

show abstract

“…PFAS contamination originating from firefighter training sites is often coincident with NAPL-forming chlorinated solvents and fuels (Moody and Field 2000;Guelfo and Higgins 2013;Montagnolli et al 2017). Substantial evidence exists indicating that PFAS are not evenly distributed within the soil system but accumulate at air-water interfaces due to their surfactant-like structure (Guelfo and Higgins 2013;Brusseau et al 2019;Schaefer et al 2019;Guo et al 2020;Lyu and Brusseau 2020) which could substantially retard PFAS transport through the vadose zone. In systems with NAPL present, this phenomenon would also be observed at NAPL-air and water-NAPL interfaces due to the affinity between many NAPL-forming compounds and the hydrophobic fluorocarbon tail of PFAS (Brusseau et al 2019).…”

Section: Assumptions Of Ssl Modelsmentioning

confidence: 99%

Limitations of Current Approaches for Predicting Groundwater Vulnerability from PFAS Contamination in the Vadose Zone

Rovero¹,

Cutt²,

Griffiths³

et al. 2021

Groundwater Monitoring Rem

View full text Add to dashboard Cite

show abstract

The influence of solution chemistry on air-water interfacial adsorption and transport of PFOA in unsaturated porous media

Cited by 66 publications

References 18 publications

Monitored Natural Attenuation to Manage PFAS Impacts to Groundwater: Scientific Basis

Monitored Natural Attenuation to Manage PFAS Impacts to Groundwater: Scientific Basis

Contribution of Nonaqueous-Phase Liquids to the Retention and Transport of Per and Polyfluoroalkyl Substances (PFAS) in Porous Media

Limitations of Current Approaches for Predicting Groundwater Vulnerability from PFAS Contamination in the Vadose Zone

Contact Info

Product

Resources

About