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Uptake of partially fluorinated alcohols on atmospheric ice surfaces
Abstract This work provides uptake results of CF3CF2CH2OH and CF3CF2CF2CH2OH on ice over the range temperature 203–223 K using a coated wall flow tube coupled to mass spectrometric detection. The adsorption was fully reversible and the data could be described in terms of the Langmuir isotherm for the range of concentrations and temperatures studied. For this temperature range, ΔH0 ads = −45 ± 11 kJ mol−1 and ΔH0 ads = −46 ± 8 kJ mol−1 were obtained for CF3CF2CH2OH and CF3CF2CF2CH2OH respectively (error is 2σ + 5%). Although ice surfaces do not permanently scavenge the studied partially fluorinated compounds, the partitioning between the gas phase and cirrus or snow-pack surfaces may play a role as a reservoir slowing down other permanent atmospheric sinks.
Highlights ► The study of the uptake of CFCs substitutes on ice surfaces is reported. ► Ice adsorption of partially fluorinated alcohols follows Langmuir-type behavior. ► Cirrus clouds and snow-pack behave as reversible reservoir for fluorinated alcohols.
Uptake of partially fluorinated alcohols on atmospheric ice surfaces
Abstract This work provides uptake results of CF3CF2CH2OH and CF3CF2CF2CH2OH on ice over the range temperature 203–223 K using a coated wall flow tube coupled to mass spectrometric detection. The adsorption was fully reversible and the data could be described in terms of the Langmuir isotherm for the range of concentrations and temperatures studied. For this temperature range, ΔH0 ads = −45 ± 11 kJ mol−1 and ΔH0 ads = −46 ± 8 kJ mol−1 were obtained for CF3CF2CH2OH and CF3CF2CF2CH2OH respectively (error is 2σ + 5%). Although ice surfaces do not permanently scavenge the studied partially fluorinated compounds, the partitioning between the gas phase and cirrus or snow-pack surfaces may play a role as a reservoir slowing down other permanent atmospheric sinks.
Highlights ► The study of the uptake of CFCs substitutes on ice surfaces is reported. ► Ice adsorption of partially fluorinated alcohols follows Langmuir-type behavior. ► Cirrus clouds and snow-pack behave as reversible reservoir for fluorinated alcohols.
Uptake of partially fluorinated alcohols on atmospheric ice surfaces
Moreno, Elena (Autor:in) / Aranda, Alfonso (Autor:in) / Díaz-de-Mera, Yolanda (Autor:in) / Notario, Alberto (Autor:in) / Rodríguez, Diana (Autor:in) / Bravo, Iván (Autor:in)
Atmospheric Environment ; 60 ; 76-81
09.06.2012
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Uptake , Ice , Surface , Fluorinated , Alcohol
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