Influences of Chemical Properties, Soil Properties, and Solution pH on Soil-Water Partitioning Coefficients of Per- and Polyfluoroalkyl Substances (PFASs)
| Autor: | Charles Grimison, Jochen F. Mueller, Thi Minh Hong Nguyen, Divina A. Navarro, Christopher P. Higgins, Rai S. Kookana, Jennifer Bräunig, Kristie Thompson, Mike J. McLaughlin, Craig M. Barnes, Shervin Kabiri, Jack Thompson |
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| Rok vydání: | 2020 |
| Předmět: |
Fluorocarbons
Aqueous solution media_common.quotation_subject Soil chemistry Water Ether Sorption General Chemistry 010501 environmental sciences 15. Life on land Hydrogen-Ion Concentration 01 natural sciences 6. Clean water Speciation chemistry.chemical_compound Soil chemistry Environmental chemistry Soil water Environmental Chemistry Soil properties Fluorotelomer Water Pollutants Chemical 0105 earth and related environmental sciences media_common |
| Zdroj: | Environmental sciencetechnology. 54(24) |
| ISSN: | 1520-5851 |
| Popis: | The aim of this study was to assess the soil-water partitioning behavior of a wider range of per- and polyfluoroalkyl substances (PFASs) onto soils covering diverse soil properties. The PFASs studied include perfluoroalkyl carboxylates (PFCAs), perfluoroalkane sulfonates (PFSAs), fluorotelomer sulfonates (FTSs), nonionic perfluoroalkane sulfonamides (FASAs), cyclic PFAS (PFEtCHxS), per- and polyfluoroalkyl ether acids (GenX, ADONA, 9Cl-PF3ONS), and three aqueous film-forming foam (AFFF)-related zwitterionic PFASs (AmPr-FHxSA, TAmPr-FHxSA, 6:2 FTSA-PrB). Soil-water partitioning coefficients (log Kd values) of the PFASs ranged from less than zero to approximately three, were chain-length-dependent, and were significantly linearly related to molecular weight (MW) for PFASs with MW > 350 g/mol (R2 = 0.94, p 0.5 to 1.5 log units) and zwitterions AmPr- and TAmPr-FHxSA (∼1.5 to 2 log units). Multiple soil properties described sorption of PFASs better than any single property. The effects of soil properties on sorption were different for anionic, nonionic, and zwitterionic PFASs. Solution pH could change both PFAS speciation and soil chemistry affecting surface complexation and electrostatic processes. The Kd values of all PFASs increased when solution pH decreased from approximately eight to three. Short-chain PFASs were less sensitive to solution pH than long-chain PFASs. The results indicate the complex interactions of PFASs with soil surfaces and the need to consider both PFAS type and soil properties to describe mobility in the environment. |
| Databáze: | OpenAIRE |
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