Multi-compartment distribution of perfluoroalkyl and polyfluoroalkyl substances (PFASs) in an urban catchment system
| Autor: | Tung Viet Nguyen, Tingru Yin, Huiting Chen, Ngoc Han Tran, Martin Reinhard, Karina Yew-Hoong Gin |
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| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
0208 environmental biotechnology Carboxylic Acids 02 engineering and technology 010501 environmental sciences Ecotoxicology 01 natural sciences chemistry.chemical_compound Pore water pressure Water column Fluorotelomer Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering Fluorocarbons Ecological Modeling Aqueous two-phase system Sediment Water Sorption Pollution 020801 environmental engineering Perfluorooctane chemistry Benthic zone Environmental chemistry Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Water research. 154 |
| ISSN: | 1879-2448 |
| Popis: | Ecotoxicological risks of perfluoroalkyl and polyfluoroalkyl substances (PFASs) in surface waters are difficult to model because data on PFASs distribution in multiple compartments (sediments, suspended particles and aqueous phase) are difficult to predict. This study quantified the distribution of 21 PFASs including PFCAs: C6-C13 perfluoroalkyl carboxylates, C4, C6, C8 and C10 perfluoroalkane sulfonates, 5 perfluorooctane sulfonamide substances (FOSAMs, including EtFOSA, FOSA, MeFOSAA, EtFOSAA, FOSAA), 2 N-alkyl perfluoroalkane sulfonamidoethanols (MeFOSE and EtFOSE), bis (perfluorooctyl) phosphinic acid (C8/C8 PFPIA), and 5:3 fluorotelomer carboxylic acid (5:3 acid) between bulk water and suspended particles in water column, and pore water and benthic sediments from a tropical urban water body. The distribution of PFASs between sorbed and dissolved phase was largely dependent on the perfluoroalkyl chain length (NCF2). PFCAs with NCF2 > 11 and perfluorodecane sulfonate (PFDS, NCF2 = 10) were found predominantly in the suspended particles and sediments. By contrast, short-chain PFASs (NCF2 ≤ 7) were detected predominantly in the dissolved phase. Sediment acts as a sink for long-chain PFASs while short-chain PFASs are more easily transported via the aqueous phase. Compared with benthic sediments, suspended particles, especially those in the top water layer, carried much higher concentrations of PFASs (by a factor of >100), indicating the stronger sorption capability of suspended particles. The wide variation in PFAS concentrations in suspended particles (∑PFASs concentrations: Log KD –desorption > Log KD –sorption > Log KD-SED) suggest that the distribution of PFASs in the field, especially between suspended particles and bulk water could not be well represented by lab results and that using the water concentrations in the bottom layer for estimation of pore water concentrations could lead to bias results. |
| Databáze: | OpenAIRE |
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