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    Kinetic of the gas-phase reactions of OH radicals and Cl atoms with Diethyl Ethylphosphonate and Triethyl Phosphate

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    Type
    Article
    Authors
    Laversin, H.
    El Masri, A. cc
    Rachidi, Mariam El cc
    Roth, E.
    Chakir, A.
    KAUST Department
    Clean Combustion Research Center
    Date
    2015-11-30
    Online Publication Date
    2015-11-30
    Print Publication Date
    2016-02
    Permanent link to this record
    http://hdl.handle.net/10754/583050
    
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    Abstract
    In this paper, the relative-rate technique has been used to obtain rate coefficients for the reaction of two organophosphorus compounds: Triethyl phosphate (TEP) and Diethyl ethylphosphonate (DEEP) with OH radicals and Cl atoms at atmospheric pressure and at different temperatures. The calculated rate constants were fitted to the Arrhenius expression over the temperature range 298 – 352 K. The following expressions (in cm3molecule-1s-1) were obtained for the reactions of OH and CL with DEEP and TEP: kOH+DEEP= (7.84±0.65)x10-14exp((1866±824)/T), kOH+TEP = (6.54±0.42)x10-14exp((1897±626)/T), kCl+DEEP = (5.27± 0.80)x10−11exp(765±140/T) and kCl+TEP = (5.23± 0.80)x10−11exp(736± 110/T). These results show that the reaction of the studied compounds with Cl atoms proceeds more rapidly than that with OH radicals. The related tropospheric lifetimes suggest that once emitted into the atmosphere, TEP and DEEP can be removed within a few hours in areas close to their emission sources. TEP and DEEP are principally removed by OH radicals. However, in coastal areas where the Cl atoms’ concentration is higher, TEP and DEEP removal by reaction with Cl atoms could be a competitive process.
    Citation
    Kinetic of the gas-phase reactions of OH radicals and Cl atoms with Diethyl Ethylphosphonate and Triethyl Phosphate 2015 Atmospheric Environment
    Publisher
    Elsevier BV
    Journal
    Atmospheric Environment
    DOI
    10.1016/j.atmosenv.2015.11.057
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S1352231015305641
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.atmosenv.2015.11.057
    Scopus Count
    Collections
    Articles; Clean Combustion Research Center

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