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EC number: 206-581-9
CAS number: 355-37-3
The rate constants k1for the reaction of CF3CF2CF2CF2CF2CHF2with
OH radicals were determined by using both absolute and relative rate
methods. The absolute rate constants were measured at 250 - 430 K using
the flash photolysis-laser-induced fluorescence (FP-LIF) technique and
the laser photolysis-laser-induced fluorescence (LP-LIF) technique to
monitor the OH radical concentration. The relative rate constants were
measured at 253 - 328 K in an 11.5-dm3reaction chamber with
either CHF2CI or CH2FCF3as a reference
compound. OH radicals were produced by UV photolysis of an O3-H2O-He
mixture at an initial pressure of 200 Torr. Ozone was continuously
introduced into the reaction chamber during the UV irradiation. The k1(298
K) values determined by the absolute method were (1.69± 0.07) x 10-15cm3molecule-1s-1(FP-LIF
method) and (1.72 ± 0.07) x 10-15cm3molecule-1s-1(LP-LIF
method). Whereas the k1(298 K) values determined by the
relative method were (1.87 ± 0.11) x 10-15cm3molecule-1s-1(CHF2CI
reference) and (2.12 ± 0.11) x 10-15cm3molecule-1s-1(CH2
FCF3 reference). These data are consistent with each other within the
estimated experimental uncertainties. The Arrhenius rate constant
determined from the kinetic data was k1= (4.71 ± 0.94) x
10-13 exp[-(1630± 80)/T] cm3molecule-1s-1.
Using kinetic data for the reaction of tropospheric CH3CCl3with
OH radicals [k1(272 K) = 6 0 x 10-15cm3molecule-1s-1,
tropospheric lifetime of CH3CCl3= 6.0 years]. We
estimated the tropospheric lifetime of CF3CF2CF2CF2CF2CHF2through
reaction with OH radicals to be 31 years.
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