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Atmospheric Fate and Impact of Perfluorinated Butanone and Pentanone
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    Atmospheric Fate and Impact of Perfluorinated Butanone and Pentanone
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    • Yangang Ren
      Yangang Ren
      Institut de Combustion Aérothermique, Réactivité et Environnement, Centre National de la Recherche Scientifique (ICARE-CNRS), Observatoire des Sciences de l’Univers en région Centre (OSUC), CS 50060, 45071 cedex02 Orléans, France
      More by Yangang Ren
    • François Bernard
      François Bernard
      Institut de Combustion Aérothermique, Réactivité et Environnement, Centre National de la Recherche Scientifique (ICARE-CNRS), Observatoire des Sciences de l’Univers en région Centre (OSUC), CS 50060, 45071 cedex02 Orléans, France
    • Véronique Daële
      Véronique Daële
      Institut de Combustion Aérothermique, Réactivité et Environnement, Centre National de la Recherche Scientifique (ICARE-CNRS), Observatoire des Sciences de l’Univers en région Centre (OSUC), CS 50060, 45071 cedex02 Orléans, France
    • Abdelwahid Mellouki*
      Abdelwahid Mellouki
      Institut de Combustion Aérothermique, Réactivité et Environnement, Centre National de la Recherche Scientifique (ICARE-CNRS), Observatoire des Sciences de l’Univers en région Centre (OSUC), CS 50060, 45071 cedex02 Orléans, France
      *Phone: 33 (0)2 38 25 76 12; e-mail: [email protected]
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    Environmental Science & Technology

    Cite this: Environ. Sci. Technol. 2019, 53, 15, 8862–8871
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    https://doi.org/10.1021/acs.est.9b02974
    Published July 10, 2019
    Copyright © 2019 American Chemical Society

    Abstract

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    Perfluoroketones, used as replacement to halons and CFCs, are excluded from the Montreal Protocol because they are considered as nonozone depleting substances. However, their chemical structure makes them possible greenhouse gases if their atmospheric lifetimes are long enough. To assess that possibility, we investigated the photolysis of perfluoro-2-methyl-3-pentanone (PF-2M3P), and perfluoro-3-methyl-2-butanone (PF-3M2B) using outdoor atmospheric simulation chambers. In addition, the photolysis of a non fluorinated pentanone (2-methyl-3-pentanone, 2M3P) was studied. The results showed that photolysis is the dominant loss pathway of PF-2M3P and PF-3M2B in the troposphere whereas 2M3P is lost by both photolysis and gas phase reaction with atmospheric oxidants. The photolysis effective quantum yields of PF-2M3P, PF-3M2B, and 2M3P were estimated and some of the main products identified. The photolysis of PF-2M3P and PF-3M2B was found to have a minor impact on the atmospheric burden of fluorinated acids. The atmospheric lifetimes of PF-2M3P, PF-3M2B, and 2M3P were estimated to 3–11 days, ∼13 days, and 1–2 days, respectively. Combining the obtained data, it has been concluded that with 100-year time horizon global warming potentials (GWP100) equivalent to <0.21, ∼0.29, and ≤1.3 × 10–7 for PF-2M3P, PF-3M2B, and 2M3P, respectively, these compounds will have a negligible impact on global warming.

    Copyright © 2019 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.9b02974.

    • UV absorption cross section of PF-2M3P, PF-3M2B, and 2M3P (Table S1); Beer’s law fits (Figure S2); UV absorption spectra of acetone (Figure S1); seasonal dependence of the photolysis rate of PF-2M3P, PF-3M2B, and 2M3P simulated using the TUV model (Table S2); FT-IR spectra and GC-MS spectrum (Figures S3 and S4); obtained product yields (Figures S5 and S6); formation yields from the photolysis of PF-2M3P (Table S3); corresponding photolysis pathway (Figure S7); FT-IR spectra from irradiation of 2M3P (Figure S8); (Figure S10) data used to derive the formation yield of products from the loss of 2M3P (Figure S9); corresponding proposed photolysis pathway (Figure S11); infrared absorption cross sections of 2M3P, PF-2M3P, and PF-3M2B (.txt format) used to calculate radiative efficiencies (RE) and GWPs (100 years) (Table S4); and fitting according to Beer’s law (Figures S12, S13, and S14) (PDF)

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    Environmental Science & Technology

    Cite this: Environ. Sci. Technol. 2019, 53, 15, 8862–8871
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.est.9b02974
    Published July 10, 2019
    Copyright © 2019 American Chemical Society

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