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ASSESSING THE POTENTIAL CONTRIBUTIONS OF ADDITIONAL RETENTION PROCESSES TO PFAS RETARDATION IN THE SUBSURFACE
Brusseau, M.L. Science of the Total Environment 613-614:176-185(2018)
A multi-process retention model is proposed to account for potential additional sources of retardation for PFAS transport in source zones, such as partitioning to the soil atmosphere, adsorption at air-water interfaces, partitioning to trapped organic liquids (NAPL), and adsorption at NAPL-water interfaces. An initial assessment of the relative magnitudes and significance of the retention processes was conducted for PFOS, PFOA, and an example precursor (fluorotelomer alcohol, FTOH). Study results showed that adsorption at the air-water interface was a primary source of retention for both PFOA and PFOS, contributing ~50% of total retention for the conditions employed. Adsorption to NAPL-water interfaces and partitioning to bulk NAPL were also shown to be significant sources of retention. This work has import for accurate determination of the migration potential and magnitude of mass flux to groundwater as well as for calculations of contaminant mass in source zones.
A multi-process retention model is proposed to account for potential additional sources of retardation for PFAS transport in source zones, such as partitioning to the soil atmosphere, adsorption at air-water interfaces, partitioning to trapped organic liquids (NAPL), and adsorption at NAPL-water interfaces. An initial assessment of the relative magnitudes and significance of the retention processes was conducted for PFOS, PFOA, and an example precursor (fluorotelomer alcohol, FTOH). Study results showed that adsorption at the air-water interface was a primary source of retention for both PFOA and PFOS, contributing ~50% of total retention for the conditions employed. Adsorption to NAPL-water interfaces and partitioning to bulk NAPL were also shown to be significant sources of retention. This work has import for accurate determination of the migration potential and magnitude of mass flux to groundwater as well as for calculations of contaminant mass in source zones.
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