Solubility of Acetic Add and Trifluoroacetic Add in Low-Temperature (207-245 K) Sulfuric Add Solutions: Implications for the Upper Troposphere and Lower Stratosphere
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Solubility of Acetic Add and Trifluoroacetic Add in Low-Temperature (207-245 K) Sulfuric Add Solutions : Implications for the Upper Troposphere and Lower Stratosphere. / Andersen, Mads P. Sulbaek; Axson, Jessica L.; Michelsen, Rebecca R. H.; Nielsen, Ole John; Iraci, Laura T.
I: Journal of Physical Chemistry A, Bind 115, Nr. 17, 2011, s. 4388–4396.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Solubility of Acetic Add and Trifluoroacetic Add in Low-Temperature (207-245 K) Sulfuric Add Solutions
T2 - Implications for the Upper Troposphere and Lower Stratosphere
AU - Andersen, Mads P. Sulbaek
AU - Axson, Jessica L.
AU - Michelsen, Rebecca R. H.
AU - Nielsen, Ole John
AU - Iraci, Laura T.
PY - 2011
Y1 - 2011
N2 - The solubility of gas-phase acetic acid (CH3COOH, HAc) and trifluoroacetic acid (CF3COOH, TFA) in aqueous sulfuric acid solutions was measured in a Knudsen cell reactor over ranges of temperature (207−245 K) and acid composition (40−75 wt %, H2SO4). For both HAc and TFA, the effective Henry’s law coefficient, H*, is inversely dependent on temperature. Measured values of H* for TFA range from 1.7 × 103 M atm−1 in 75.0 wt % H2SO4 at 242.5 K to 3.6 × 108 M atm−1 in 40.7 wt % H2SO4 at 207.8 K. Measured values of H* for HAc range from 2.2 × 105 M atm−1 in 57.8 wt % H2SO4 at 245.0 K to 3.8 × 108 M atm−1 in 74.4 wt % H2SO4 at 219.6 K. The solubility of HAc increases with increasing H2SO4 concentration and is higher in strong sulfuric acid than in water. In contrast, the solubility of TFA decreases with increasing sulfuric acid concentration. The equilibrium concentration of HAc in UT/LS aerosol particles is estimated from our measurements and is found to be up to several orders of magnitude higher than those determined for common alcohols and small carbonyl compounds. On the basis of our measured solubility, we determine that HAc in the upper troposphere undergoes aerosol partitioning, though the role of H2SO4 aerosol particles as a sink for HAc in the upper troposphere and lower stratosphere will only be discernible under high atmospheric sulfate perturbations.
AB - The solubility of gas-phase acetic acid (CH3COOH, HAc) and trifluoroacetic acid (CF3COOH, TFA) in aqueous sulfuric acid solutions was measured in a Knudsen cell reactor over ranges of temperature (207−245 K) and acid composition (40−75 wt %, H2SO4). For both HAc and TFA, the effective Henry’s law coefficient, H*, is inversely dependent on temperature. Measured values of H* for TFA range from 1.7 × 103 M atm−1 in 75.0 wt % H2SO4 at 242.5 K to 3.6 × 108 M atm−1 in 40.7 wt % H2SO4 at 207.8 K. Measured values of H* for HAc range from 2.2 × 105 M atm−1 in 57.8 wt % H2SO4 at 245.0 K to 3.8 × 108 M atm−1 in 74.4 wt % H2SO4 at 219.6 K. The solubility of HAc increases with increasing H2SO4 concentration and is higher in strong sulfuric acid than in water. In contrast, the solubility of TFA decreases with increasing sulfuric acid concentration. The equilibrium concentration of HAc in UT/LS aerosol particles is estimated from our measurements and is found to be up to several orders of magnitude higher than those determined for common alcohols and small carbonyl compounds. On the basis of our measured solubility, we determine that HAc in the upper troposphere undergoes aerosol partitioning, though the role of H2SO4 aerosol particles as a sink for HAc in the upper troposphere and lower stratosphere will only be discernible under high atmospheric sulfate perturbations.
U2 - 10.1021/jp200118g
DO - 10.1021/jp200118g
M3 - Journal article
VL - 115
SP - 4388
EP - 4396
JO - Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory
JF - Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory
SN - 1089-5639
IS - 17
ER -
ID: 275058196