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EC number: 206-996-5
CAS number: 420-46-2
Rate constant for OH-mediated photolysis at 25 deg. C is 1.24+/-0.09.
From peer reviewed journal (KC=1) Orkin, V.L., Huie, R.E., Kurylo,
M.J. (1996) Atmospheric lifetimes of HFC-143a and HFC-245fa: flash
photolysis resonance fluorescence measurements of the OH reaction rate
constants. J. Phys. Chem. 100, 8907-8912.
Photodegradation occurs primarily with
hydroxyl radicals, resulting in a half-life of approximately 9,600 days
(Orkin et al., 1996; Hayman and Derwant, 1997 and Naik et al., 2000). A
photochemical trajectory model has calculated a photochemical ozone
creation potential (POCP) of 0.0 for HFC-143a, thus HFC-143a should
make a negligible contribution to photochemical ozone production (Hayman
and Derwent, 1997).
chemical-radiative-transport model of the global atmosphere determined
the atmospheric lifetime of 1,1,1,-trifluoroethane to be 47.2 years,
compared with 53.5 years as previously reported by Grainer et al., 1999. The
difference in values appears to result from the slow, but not trivial
loss in the stratosphere. The
direct global warming potential (GWP) of HFC-143a at 20-, 100-
and 500 year time horizons was calculated to be 5,695, 4,352, and 1,537,
respectively (relative to a value of 1 for CO2). The
model took into account evaluated atmospheric lifetimes and radiative
percent difference in GWP for HFC-143a for the 100-year time horizon in
this study (4,352) was 19% less than that reported (5,400) by the
Grainer et al. (1999) (Naik et al., 2000, U.S. EPA, 2009).
In the 4th IPCC assessment report, the GWP over a 100 year time horizon
was assessed at 4470 with an atmospheric lifetime of 52 years (4th IPCC
assessment report, table 2.14 chapter 2, 2007)
Grainer, C. et al. 1999. Climate effects of ozone and halocarbon
changes in Scientific Assessment of Ozone Depletion: 1998, Ch.
10, Rep. 44, pp.383 -416, Global Ozone Res. and Monit. Proj. World
Meteorol. Org., Geneva, Switzerland.
Hayman, GD and Derwent, RC, 1997. Atmospheric chemical reacitivity
and ozone-forming potentials of potential CFC replacements. Environ.
Sci. Technol. 31, 327 -336.
Naik, V., Jain, AK, Patten, KO, and Wuebbles, DJ. 2000. Consistent sets
of atmospheric lifetimes and radiative forcings on climate for CFC
replacements: HCFCs and HFCs. J. Geophysical Res. 105, (D5), 6903
Orkin, VL, Huie, RE, Kurylo, MJ. 1996. Atmospheric lifetimes of HFC-143a
and HFC-245fa: Flash photolysis resonance fluoresence measurements of
the OH reaction rate constants. J. Phy. Chem., 100, 8907 -8912.
U.S.EPA 2008a. Estimation Programs Interface Suite for Microsoft Windows
v. 4.00. United States Environmental Protection Agency, Washington,
U.S.EPA 2009. Federal Register Vol 74, No. 68, Friday April 10, 2009 p.
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