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3856452 
Journal Article 
Characterization of occurrence, sources and sinks of perfluoroalkyl and polyfluoroalkyl substances (PFASs) in a tropical urban catchment 
Chen, H; Reinhard, M; Nguyen, TV; You, L; He, Y; Gin, KY 
2017 
Yes 
Environmental Pollution
ISSN: 0269-7491
EISSN: 1873-6424 
227 
397-405 
English 
Understanding the sources, occurrence and sinks of perfluoroalkyl and polyfluoroalkyl substances (PFASs) in the urban water cycle is important to protect and utilize local water resources. Concentrations of 22 target PFASs and general water quality parameters were determined monthly for a year in filtered water samples from five tributaries and three sampling stations of an urban water body. Of the 22 target PFASs, 17 PFASs were detected with a frequency >93% including PFCAs: C4-C12 perfluoroalkyl carboxylates, C4, C6, C8, and C10 perfluoroalkane sulfonates, perfluorooctane sulfonamides and perfluorooctane sulfonamide substances (FOSAMs), C10 perfluoroalkyl phosphonic acid (C10 PFPA), 6:2 fluorotelomer sulfonic acid (6:2 FTSA) and C8/C8 perfluoroalkyl phosphinic acid (C8/C8-PFPIA). The most abundant PFASs in water were PFBS (1.4-55 ng/L), PFBA (1.0-23 ng/L), PFOS (1.5-24 ng/L) and PFOA (2.0-21 ng/L). In the tributaries, PFNA concentrations ranged from 1.2 to 87.1 ng/L except in the May 2013 samples of two tributaries, which reached 520 and 260 ng/L. Total PFAS concentrations in the sediment samples ranged from 1.6 to 15 ng/g d.w. with EtFOSAA, PFDoA, PFOS and PFDA being the dominant species. Based on water and sediment data, two types of sources were inferred: one-time or intermittent point sources and continuous non-point sources. FOSAMs and PFOS released continually from non-point sources, C8/C8 PFPIA, PFDoA and PFUnA was released from point sources. The highly water soluble short-chain PFASs including PFBA, PFPeA and PFBS remained predominantly in the water column. The factors governing solution phase concentrations appear to be compound hydrophobicity and sorption to suspended particles. Correlation of the dissolved phase concentrations with precipitation data suggested stormwater was a significant source of PFBA, PFBS, PFUnA and PFDoA. Negative correlations with precipitation indicated sources feeding FOSAA and FOSA directly into the tributaries. 
Occurrence; Surface water; Sediments; PFASs; Environmental parameters; Water quality 
PFAS
• FtS 6:2
     Literature Search
          Pubmed
          WOS
• ^Per- and Polyfluoroalkyl Substances (PFAS)
     PFOA (335-67-1) and PFOS (1763-23-1)
          Literature Search – Adverse outcome pathway (2015-present)
               Pubmed
               WOS
     PFBS (375-73-5)
          Literature Search
               Pubmed
               WOS
     PFDoA (307-55-1)
          Literature Search
               Pubmed
               WOS
     PFUnA (2058-94-8)
          Literature Search
               Pubmed
               WOS
     PFDA (335-76-2)
          Literature Search
               Pubmed
               WOS
     PFNA (375-95-1)
          Literature Search
               Pubmed
               WOS
     PFPeA (2706-90-3)
          Literature Search
               Pubmed
               WOS
     PFBA (375-22-4)
          Literature Search
               Pubmed
               WOS
     PFOSA (754-91-6)
          Literature Search
               WOS
     FtS 6:2 (27619-97-2)
          Literature Search
               Pubmed
               WOS
• PFBA
     Literature Search
          Pubmed
          WOS
     Screening Results
          Excluded/Not on Topic
• PFBS
          Pubmed
          WOS
          Excluded/Not on Topic
     Search
          PubMed
          WOS
     Excluded
          PubMed
          WOS
• PFDA
     Literature Search
          Pubmed
          WOS
     Screening Results
          Excluded/Not on Topic
     Title and Abstract Screening
          Excluded
• PFDoA
     Literature Search
          Pubmed
          WOS
     Screening Results
          Excluded/Not on Topic
• PFNA
     Literature Search
          Pubmed
          Toxline
          WOS
     Screening Results
          Excluded/Not on Topic
     PFNA Literature Search pre-2019
          WOS
     PFNA May 2019 Update
          Pubmed
          Toxnet
          Web of Science
     Title and Abstract Screening
          Full Text Screening
          Tagged as Supplemental
               Environmental occurance
• PFOA (335-67-1) and PFOS (1763-23-1)
     Literature Search – Adverse outcome pathway (2015-present)
          Pubmed
          WOS
     Screening Results
          Excluded/Not on Topic
     Literature Search Update (2013-2019)
          PubMed
          WOS
• PFOSA
     Literature Search
          Pubmed
          WOS
     Screening Results
          Excluded/Not on Topic
• PFPeA
     Literature Search
          Pubmed
          WOS
     Screening Results
          Excluded/Not on Topic
• PFUnA
     Literature Search
          Pubmed
          WOS
     Screening Results
          Excluded/Not on Topic