PMID- 26923241
OWN - NLM
STAT- MEDLINE
DCOM- 20161102
LR  - 20181202
IS  - 1879-1298 (Electronic)
IS  - 0045-6535 (Linking)
VI  - 151
DP  - 2016 May
TI  - Assessment of the atmospheric loss processes initiated by OH radicals and 
      sunlight, and the radiative efficiency for a series of hydrofluoroolefins, 
      CF3(CF2)x=1,3,5CHCH2.
PG  - 45-54
LID - S0045-6535(16)30176-X [pii]
LID - 10.1016/j.chemosphere.2016.02.025 [doi]
AB  - Hydrofluoroolefins (HFOs) of the type CF3(CF2)x>/=0CHCH2, are currently being 
      suggested as substitutes of some hydrofluorocarbons (HFCs). In this work, an 
      assessment of the atmospheric removal of CF3(CF2)x=1,3,5CHCH2, initiated by 
      reaction with hydroxyl (OH) radicals and UV solar radiation is addressed. For 
      that purpose, the rate coefficients for the OH + CF3(CF2)x=1,3,5CHCH2 reaction, 
      kOH(T = 263-358 K), were determined by the pulsed laser photolysis-laser induced 
      fluorescence technique. A slightly negative temperature dependence of kOH was 
      observed, obtaining Ea/R (in K) values of -124 +/- 15, -128 +/- 6 and -160 +/- 10, for 
      CF3CF2CHCH2, CF3(CF2)3CHCH2 and CF3(CF2)5CHCH2, respectively. The estimated 
      atmospheric lifetimes are around 8 days, considering that HFOs are well-mixed in 
      the troposphere. Furthermore, an evaluation of the long-wave and short-wave 
      absorption process of these HFOs have been carried out by determining the UV 
      (191-367 nm) and IR (4000-500 cm(-1)) absorption cross sections at 298 K. Based 
      on the obtained UV absorption cross sections, no photolysis of 
      CF3(CF2)x=1,3,5CHCH2 is expected in the troposphere (lambda > 290 nm). These species 
      strongly absorb IR radiation in the atmospheric IR window. Despite the strong 
      absorption in the IR region, the lifetime corrected radiative efficiencies are 
      low (0.033 W m(-2) ppb(-1) for CF3(CF2)3CHCH2 and 0.039 Wm(-2) ppb(-1) for 
      CF3(CF2)5CHCH2). Calculation of GWPs for these species has been performed as a 
      function of the horizon time, providing values higher than unity for a 
      short-period term, decreasing dramatically for longer periods. Therefore, it is 
      concluded that emissions of these species do not affect the radiative forcing of 
      climate, making them suitable replacements of large-GWP HFCs.
CI  - Copyright (c) 2016. Published by Elsevier Ltd.
FAU - Gonzalez, Sergio
AU  - Gonzalez S
AD  - Departamento de Quimica Fisica, Facultad de Ciencias y Tecnologias Quimicas, 
      Universidad de Castilla-La Mancha, Avda. Camilo Jose Cela, s/n. 13071, Ciudad 
      Real, Spain.
FAU - Jimenez, Elena
AU  - Jimenez E
AD  - Departamento de Quimica Fisica, Facultad de Ciencias y Tecnologias Quimicas, 
      Universidad de Castilla-La Mancha, Avda. Camilo Jose Cela, s/n. 13071, Ciudad 
      Real, Spain; Instituto de Investigacion en Combustion y Contaminacion 
      Atmosferica. Universidad de Castilla-La Mancha. Camino de Moledores, s/n. 13071, 
      Ciudad Real, Spain.
FAU - Albaladejo, Jose
AU  - Albaladejo J
AD  - Departamento de Quimica Fisica, Facultad de Ciencias y Tecnologias Quimicas, 
      Universidad de Castilla-La Mancha, Avda. Camilo Jose Cela, s/n. 13071, Ciudad 
      Real, Spain; Instituto de Investigacion en Combustion y Contaminacion 
      Atmosferica. Universidad de Castilla-La Mancha. Camino de Moledores, s/n. 13071, 
      Ciudad Real, Spain. Electronic address: Jose.Albaladejo@uclm.es.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20160315
PL  - England
TA  - Chemosphere
JT  - Chemosphere
JID - 0320657
RN  - 0 (Alkenes)
RN  - 0 (Hydrocarbons, Fluorinated)
RN  - 3352-57-6 (Hydroxyl Radical)
SB  - IM
MH  - Alkenes/*chemistry/*radiation effects
MH  - Hydrocarbons, Fluorinated/*chemistry/*radiation effects
MH  - Hydroxyl Radical/*chemistry
MH  - Photolysis
MH  - *Sunlight
MH  - Temperature
OTO - NOTNLM
OT  - Absorption cross sections
OT  - Global warming potential
OT  - HFC replacement
OT  - Kinetics
OT  - Lifetime
OT  - Rate coefficients
EDAT- 2016/03/01 06:00
MHDA- 2016/11/03 06:00
CRDT- 2016/03/01 06:00
PHST- 2015/12/17 00:00 [received]
PHST- 2016/02/02 00:00 [revised]
PHST- 2016/02/02 00:00 [accepted]
PHST- 2016/03/01 06:00 [entrez]
PHST- 2016/03/01 06:00 [pubmed]
PHST- 2016/11/03 06:00 [medline]
AID - S0045-6535(16)30176-X [pii]
AID - 10.1016/j.chemosphere.2016.02.025 [doi]
PST - ppublish
SO  - Chemosphere. 2016 May;151:45-54. doi: 10.1016/j.chemosphere.2016.02.025. Epub 
      2016 Mar 15.