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Atmospheric Chemistry of Perfluorinated Carboxylic Acids:  Reaction with OH Radicals and Atmospheric Lifetimes

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Ford Motor Company, SRL-3083, P.O. Box 2053, Dearborn, Michigan 48121-2053
Department of Chemistry, 80 St. George Street, University of Toronto, Toronto, Ontario, Canada M5S 3H6
Cite this: J. Phys. Chem. A 2004, 108, 4, 615–620
Publication Date (Web):December 30, 2003
https://doi.org/10.1021/jp036343b
Copyright © 2004 American Chemical Society
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    Abstract

    Relative rate techniques were used to study the kinetics of the reactions of OH radicals with a homologous series of perfluorinated acids, F(CF2)nCOOH (n = 1, 2, 3, 4), in 700 Torr of air at 296 ± 2 K. For n > 1, the length of the F(CF2)n group had no discernible impact on the reactivity of the molecule. For n = 1, k(OH + F(CF2)nCOOH) = (9.35 ± 2.08) × 10-14 cm3 molecule-1 s-1. For n = 2−4, k(OH + F(CF2)nCOOH) = (1.69 ± 0.22) × 10-13 cm3 molecule-1 s-1. Dimerization constants for 2F(CF2)nCOOH = (F(CF2)nCOOH)2 were determined to be 0.32 ± 0.03 Torr-1, 0.30 ± 0.03 Torr-1, 0.41 ± 0.04 Torr-1, and 0.46 ± 0.05 Torr-1 for n = 1, 2, 3, 4, respectively. Atmospheric lifetimes of F(CF2)nCOOH with respect to reaction with OH radicals are estimated to be approximately 230 days for n = 1 and 130 days for n > 1. Reaction with OH radicals is a minor atmospheric fate of F(CF2)nCOOH. The major atmospheric removal mechanism for F(CF2)nCOOH is believed to be wet and dry deposition which probably occurs on a time scale of the order of 10 days.

    *

     Corresponding author. E-mail:  [email protected].

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