title: Sorption of Perfluoroalkyl Phosphonates and Perfluoroalkyl Phosphinates in Soils.
abstract: Perfluoroalkyl phosphonates (PFPAs) and perfluoroalkyl phosphinates (PFPiAs) are recently discovered perfluoroalkyl acids (PFAAs) that have been widely detected in house dust, aquatic biota, surface water, and wastewater environments. The sorption of C6, C8, and C10 monoalkylated PFPAs and C6/C6, C6/C8, and C8/C8 dialkylated PFPiAs was investigated in seven soils of varying geochemical parameters. Mean distribution coefficients, log Kd*, ranged from 0.2 to 2.1 for the PFPAs and PFPiAs and were generally observed to increase with perfluoroalkyl chain length. The log Kd*of PFPiAs calculated here (1.6-2.1) were similar to those previously measured for the longer-chain perfluorodecanesulfonate (1.9, PFDS) and perfluoroundecanoate (1.7, PFUnA) in sediments, but overall when compared as a class, were greater than those for the perfluoroalkanesulfonates (-0.8-1.9, PFSAs), perfluoroalkyl carboxylates (-0.4-1.7, PFCAs), and PFPAs (0.2-1.5). No single soil-specific parameter, such as pH and organic carbon content, was observed to control the sorption of PFPAs and PFPiAs, the lack of which may be attributed to competing interferences in the naturally heterogeneous soils. The PFPAs were observed to desorb to a greater extent and likely circulate as aqueous contaminants in the environment, while the more sorptive PFPiAs would be preferentially retained by environmental solid phases.
authors.affiliation: Sciex , 71 Four Valley Drive, Concord, Ontario, Canada , L4K 4 V8.
authors.forename: Holly
authors.identifier: 0000-0001-5182-6193
authors.initials: H
authors.lastname: Lee
authors.affiliation: Department of Chemistry, University of Toronto , 80 Saint George Street, Toronto, Ontario Canada , M5S 3H6.
authors.forename: Scott A
authors.initials: SA
authors.lastname: Mabury
mesh_terms: D005466:Fluorocarbons; D063065:Organophosphonates; D012987:Soil; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical
chemical_list: D005466:Fluorocarbons; D063065:Organophosphonates; D012987:Soil; D014874:Water Pollutants, Chemical; D014867:Water