Influences of Chemical Properties, Soil Properties, and Solution pH on Soil–Water Partitioning Coefficients of Per- and Polyfluoroalkyl Substances (PFASs)

• DOI: 10.1021/acs.est.0c05705
• Publication Date: 2020-11-28T13:00:31Z
• Authors: Thi Minh Hong Nguyen; Jennifer Bräunig; Kristie Thompson; Jack Thompson; Shervin Kabiri; Divina A. Navarro; Rai S. Kookana; Charles Grimison; Craig M. Barnes; Christopher P. Hi...; Michael J. McLaug...; Jochen F. Mueller
• Keywords: Fluorocarbons; Water; Chemical; General Chemistry; Hydrogen-Ion Concentration; 15. Life on land; 1600 Chemistry; 01 natural sciences; 630; 6. Clean water; Soil; 2304 Environmental Chemistry; Environmental Chemistry; Water Pollutants; Water Pollutants, Chemical; 0105 earth and related environmental sciences

The aim of this study was to assess the soil-water partitioning behavior a wider range per- and polyfluoroalkyl substances (PFASs) onto soils covering diverse soil properties. PFASs studied include perfluoroalkyl carboxylates (PFCAs), perfluoroalkane sulfonates (PFSAs), fluorotelomer (FTSs), nonionic sulfonamides (FASAs), cyclic PFAS (PFEtCHxS), ether acids (GenX, ADONA, 9Cl-PF3ONS), three aqueous film-forming foam (AFFF)-related zwitterionic (AmPr-FHxSA, TAmPr-FHxSA, 6:2 FTSA-PrB). Soil-water coefficients (log Kd values) ranged from less than zero approximately three, were chain-length-dependent, significantly linearly related molecular weight (MW) for with MW > 350 g/mol (R2 = 0.94, p < 0.0001). Across all soils, values short-chain (≤5 -CF2- moieties) similar varied (<0.5 log units) compared long-chain (>0.5 1.5 zwitterions AmPr- TAmPr-FHxSA (∼1.5 2 units). Multiple properties described sorption better any single property. effects on different anionic, nonionic, PFASs. Solution pH could change both speciation chemistry affecting surface complexation electrostatic processes. increased when solution decreased eight three. Short-chain sensitive results indicate complex interactions surfaces need consider type describe mobility in environment.