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Degradation of fluorotelomer alcohols: a likely atmospheric source of perfluorinated carboxylic acids.
TLDR
Smog chamber studies that indicate fluorotelomer alcohols (FTOHs) can degrade in the atmosphere to yield a homologous series of PFCAs are presented, suggesting Atmospheric degradation of FTOHs is likely to contribute to the widespread dissemination of P FCAs.
Experimental pKa determination for perfluorooctanoic acid (PFOA) and the potential impact of pKa concentration dependence on laboratory-measured partitioning phenomena and environmental modeling.
TLDR
It was suggested that a pKa correction factor, which accounts for this concentration-dependent shift in acid/base equilibrium, should be applied to PFCA partition efficients before they are implemented in environmental fate models.
Polyfluorinated telomer alcohols and sulfonamides in the North American troposphere.
TLDR
Analysis via gas chromatography-chemical ionization-mass spectrometry indicated that both polyfluorinated sulfonamides and fluorinated telomer alcohols (FTOHs) are widely distributed throughout the North American troposphere with mean concentrations ranging from 22 to 403 pg/m3 and from 11 to 165 pg/ m3 respectively.
Atmospheric chemistry of perfluoroalkanesulfonamides: kinetic and product studies of the OH radical and Cl atom initiated oxidation of N-ethyl perfluorobutanesulfonamide.
TLDR
Simple modeling exercises suggest that reaction with OH radicals will dominate removal of perfluoroalkanesulfonamides from the gas phase (wet and dry deposition will not be important) and that the atmospheric lifetime of NEtFBSA in theGas phase will be 20-50 days, thus allowing substantial long-range atmospheric transport.
Spatial distribution of perfluoroalkyl contaminants in lake trout from the Great Lakes.
TLDR
Individual whole body homogenates of 4 year old lake trout samples collected in 2001 from each of the Great Lakes were extracted using a novel fluorophilicity cleanup step and analyzed for perfluoroalkyl compounds (PFCs).
Collection of airborne fluorinated organics and analysis by gas chromatography/chemical ionization mass spectrometry.
TLDR
Application of the method to the analysis of ambient air from urban and rural sites confirmed the presence of six novel fluorinated atmospheric contaminants at picogram per meter3 concentrations, and low concentrations of fluoroorganics were consistently detected in blanks, however, this did not prevent confirmation or quantification of environmental concentrations.
Atmospheric lifetime of fluorotelomer alcohols.
TLDR
The atmospheric lifetime of F(CF2CF2)nCH2CH2OH (n > or = 2) is determined by reaction with OH radicals and is approximately 20 d.
Thermolysis of fluoropolymers as a potential source of halogenated organic acids in the environment
TLDR
Modelling indicates that the thermolysis of fluoropolymers in industrial and consumer high-temperature applications is likely to be a significant source of trifluoroacetate in urban rain water, and CFCs and fluorocarbons—groups that can destroy ozone and act as greenhouse gases, respectively—are detected among the other thermal degradation products, suggesting that continued use of fluor polymers may also exacerbate stratospheric ozone-depletion and global warming.
Formation of C7F15COOH (PFOA) and other perfluorocarboxylic acids during the atmospheric oxidation of 8:2 fluorotelomer alcohol.
TLDR
Fluorotelomer alcohols such as n-C8F17CH2CH2 CH2OH appear to be a significant global source of persistent bioaccumulative perfluorocarboxylic acid pollution.
Aerosol enrichment of the surfactant PFO and mediation of the water--air transport of gaseous PFOA.
TLDR
The results imply that water bodies are not a permanent sink for atmospheric PFOA as previous studies have suggested and suggest that rainout rates are likely to be longer than previously hypothesized.
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