Journal
ENVIRONMENTAL POLLUTION
Volume 300, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2022.118957
Keywords
PFASs; Salinity; Marine sediment; Hydrophobic interactions; Sorption; Desorption
Categories
Funding
- National Natural Science Foundation of China [42030502, 42090041, 42067054]
- Innovation-driven Development Projects [GuikeAA18242031]
- Natural Science Foundation of Guangxi [2018GXNSFAA050144]
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This study investigated the sorption, sorption isotherms, and desorption behaviors of legacy and emerging PFASs onto marine sediments at different salinities. The results showed that the adsorption of PFASs onto sediment was influenced by compound and solution-specific parameters, and salinity had a significant impact on the fate of PFASs in aquatic environments.
Per-and polyfluoroalkyl substances (PFASs) have attracted extensive attention since this century due to their wide distribution, persistence, bioaccumulation/biomagnification potential, and (eco)toxicity. In the present study, we investigated the sorption kinetics, sorption isotherms and desorption behaviors of legacy and emerging PFASs with different chain lengths and functional end groups onto marine sediments at four different salinities (0, 10, 20, and 30 practical salinity units (psu)). Results revealed that the sorption of PFASs onto sediment can be well described by the pseudo-second-order kinetic model. PFASs sorption was influenced by both compound specific and solution-specific parameters. The distribution coefficient (K-d) for PFASs were increased with the increase of perfluorocarbon chain length and salinity, suggesting that hydrophobic and electrostatic interactions were involved in the adsorption process. 6:2 FTSA showed the lowest adsorption among PFASs with eight carbon atoms (6:2 FTSA, PFOA and PFOS). The increase of perfluorocarbon chain length of PFASs and salinity would result in the decrease of desorption rate of PFASs from sediment. In addition, PFCAs were desorbed more easily from the sediment than the PFSAs with the same perfluorocarbon chain length at all salinity groups. The present study demonstrated that salinity can apparently influence the fate of PFASs in aquatic environment and provided valuable data for modeling the fate of PFASs in real environment.
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