Subsurface transport potential of perfluoroalkyl acids (PFAAs): Column experiments and modeling

Jennifer Guelfo, Assaf Wunsch, John McCray, John F. Stults, Christopher P. Higgins

Research output: Contribution to journalArticlepeer-review


Transport of ten perfluoroalkyl acids (PFAAs) was studied with one-dimensional (1-D) saturated column experiments using four soil types with an organic carbon fraction (foc) range of ~0–0.045. Columns were operated under conditions relevant to aqueous film-forming foam (AFFF)-impacted fire protection training areas to determine the ability of equilibrium transport parameters to describe 1-D PFAA transport, if rate-limited sorption influences PFAA transport, and if kinetic parameters can be used to evaluate factors causing rate-limited sorption. Results of initial screening of PFAA breakthrough found that over half of the breakthrough curves deviated from equilibrium transport and merited further investigation. Subsequent analysis showed that, in many cases, these deviations could be accounted for by considering the range of applicable equilibrium Kd values (i.e. based on standard deviation) applicable to the solid phase. Thus, transport of the majority of PFAAs in 3 soils with foc of
Original languageEnglish
Pages (from-to)103661
JournalDefault journal
StatePublished - Aug 1 2020


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