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3856464 
Journal Article 
Perfluorinated alkyl substances (PFASs) in northern Spain municipal solid waste landfill leachates 
Fuertes, I; Gómez-Lavín, S; Elizalde, MP; Urtiaga, A 
2017 
Yes 
Chemosphere
ISSN: 0045-6535
EISSN: 1879-1298 
168 
399-407 
English 
Landfill leachates have been recognized as significant secondary sources of poly- and perfluoroalkyl substances (PFASs). This study presents data on the occurrence and concentration of 11 perfluoroalkyl carboxylates (PFCAs) and 5 perfluoroalkyl sulfonates (PFSAs) in leachates from 4 municipal solid waste landfill sites located across northern Spain. To the best of our knowledge, this is the first report of the presence of PFASs in Spanish landfill leachates. Two of the landfill sites applied on-site treatment using membrane bioreactors (MBR), and its effect on PFASs occurrence is also reported. Total PFASs (∑PFASs) in raw leachates reached 1378.9 ng/L, while in treated samples ∑PFASs was approximately two-fold (3162.3 ng/L). PFCAs accounted for the majority of the detected PFASs and perfluorooctanoic acid (PFOA) was the dominant compound in raw leachates (42.6%), followed by shorter chain PFHxA (30.1%), PFPeA and PFBA. The age of the sites might explain the PFASs pattern found in raw leachates as all of them were stabilized leachates. However, PFASs profile was different in treated samples where the most abundant compound was PFHxA (26.5%), followed by linear perfluorobutane sulfonate (L-PFBS) (18.7%) and PFOA (17.7%). The overall increase of the PFASs content as well as the change in the PFASs profile after the MBR treatment, could be explained by the possible degradation of PFASs precursors such as fluorotelomer alcohols or fluorotelomer sulfonates. Using the volume of leachates generated in the landfill sites, that served 1.8 million people, the discharge of 16 ∑PFASs contained in the landfill leachates was estimated as 1209 g/year. 
Perfluoroalkyl substances (PFAS); Landfill leachate; Perfluorooctanoic acid (PFOA); Perfluoroalkyl carboxylates; Perfluoroalkyl sulfonates 
PFAS
• ^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
     PFHxA (307-24-4)
          Literature Search
               Pubmed
               WOS
     PFPeA (2706-90-3)
          Literature Search
               Pubmed
               WOS
     PFBA (375-22-4)
          Literature Search
               Pubmed
               WOS
• PFBA
     Literature Search
          Pubmed
          WOS
     Screening Results
          Excluded/Not on Topic
     Protocol References
• PFBS
          Pubmed
          WOS
          Excluded/Not on Topic
     Search
          PubMed
          WOS
     Excluded
          WOS
• PFNA
     Literature Search
          Toxline
     PFNA May 2019 Update
          Toxnet
     Title and Abstract Screening
          Excluded
               Not relevant to PECO
• 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
• PFPeA
     Literature Search
          Pubmed
          WOS
     Screening Results
          Excluded/Not on Topic