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

Published literature for reported sorption coefficients (K) of eight anionic per- and polyfluoroalkyl substances (PFAS) in soil was reviewed. K values spanned three to five log units indicating that no single value would be appropriate for use in estimating PFAS impacts to groundwater using existing soil-water partition equations. Regression analysis was used to determine if the soil or solution parameters might be used to predict K values.