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Partitioning of perfluorooctanoate (PFOA), perfluorooctane sulfonate (PFOS) and perfluorooctane sulfonamide (PFOSA) between water and sediment |
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| Authors: | Ahrens Lutz Yeung Leo W Y Taniyasu Sachi Lam Paul K S Yamashita Nobuyoshi |
| Institution: | a Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Coastal Research, Department for Environmental Chemistry, D-21502 Geesthacht, Germany b Department of Biology and Chemistry, City University of Hong Kong, HKSAR, China c National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan |
| Abstract: | Laboratory partitioning experiments were conducted to elucidate the sorption behaviour and partitioning of perfluoroalkyl compounds (PFCs). Three different sediment types were used and separately spiked with perfluorooctanoate (PFOA), perfluorooctane sulfonate (PFOS) and perfluorooctane sulfonamide (PFOSA) at low environmentally realistic concentrations. PFOA, PFOS and PFOSA were mainly distributed in the dissolved phase at low suspended solid concentrations, indicating their long-range transport potential in the marine environment. In all cases, the equilibrium isotherms were linear and the organic carbon normalised partition coefficients (KOC) decreased in the following order: PFOSA (log KOC = 4.1 ± 0.35 cm3 g−1) > PFOS (3.7 ± 0.56 cm3 g−1) > PFOA (2.4 ± 0.12 cm3 g−1). The level of organic content had a significant influence on the partitioning. For the sediment with negligible organic content the density of the sediment became the most important factor influencing the partitioning. Ultimately, data on the partitioning of PFCs between aqueous media and suspended solids are essential for modelling their transport and environmental fate. |
| Keywords: | PFOS PFOA PFOSA PFCs Partitioning Sediment |
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