Document Detail

Per- and polyfluoroalkyl substances in landfill leachate: Patterns, time-trends, sources.
MedLine Citation:
PMID:  23030600     Owner:  NLM     Status:  Publisher    
Concentrations and isomer profiles for 24 per- and polyfluoroalkyl substances (PFASs) were monitored over 5 months (February-June, 2010) in municipal landfill leachate. These data were used to assess the role of perfluoroalkyl acid (PFAA) precursor degradation on changes in PFAA concentrations over time. The influence of total organic carbon, total suspended solids, pH, electrical conductivity (EC), leachate flow rates, and meteorological data (precipitation, air temperature) on leachate PFAS concentrations was also investigated. Perfluoropentanoate and perfluorohexanoate were typically the dominant PFASs in leachate, except for March-April, when concentrations of perfluorooctane sulfonate, perfluorooctanoate and numerous PFAA-precursors (i.e. (N-alkyl) perfluorooctane sulfonamides and fluorotelomer carboxylic acids) increased by a factor of 2-10 (~4 µg/L- >35 µg/L ∑PFASs). During this time, isomer profiles of PFOA became increasingly dominated by the linear isomer, likely from transformation of linear, telomer-manufactured precursors. While ∑PFAA-precursors accounted for up to 71% of ∑PFASs (molar basis) in leachate from this site, samples from a 2nd landfill displayed only low concentrations of precursors (<1% of ∑PFASs), possibly due to differences in waste inputs or handling. Overall, degradation of PFAA-precursors and changes in leachate pH, EC, and 24-hr precipitation were the most important factors controlling PFAS occurrence in leachate. 8.5-25 kg/yr (mean 16 kg/yr) of ∑PFASs was estimated to leave the landfill via leachate for subsequent treatment at a wastewater treatment plant.
Jonathan Philip Benskin; Belinda Li; Michael G Ikonomou; John R Grace; Loretta Li
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-3
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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