Uptake of SO2 on HOBr-ice surfaces

The Journal of Physical Chemistry. a
Ronghua Jin, Liang T Chu

Abstract

The uptake of SO2 on HOBr-treated ice surfaces has been studied using a flow reactor coupled with a differentially pumped quadrupole mass spectrometer at 190-240 K. The initial uptake coefficient was determined as a function of HOBr surface coverage, theta(HOBr), on the ice. The uptake coefficients increase as the HOBr coverage increases. The uptake coefficient can be expressed as gamma(t) = k(h)theta(HOBr), where k(h) = 1.5 x 10(-19) molecules(-1) cm(-2) at 191 K and k(h) = 6.4 x 10(-21) molecules(-1) cm(-2) at 210 K and theta(HOBr) is in the range of 8 x 10(13) to 1.2 x 10(15) molecules cm(-2). The effects of temperature and film thickness on the uptake coefficients of SO2 by the HOBr-treated ice films were also studied. The activation energy E(a) of SO(2) on HOBr-ice surfaces is approximately -81 +/- 8 kJ/mol in the 190-215 K range. Kinetic results were interpreted in terms of the Eley-Rideal mechanism. This study suggests that the uptake of SO2 on ice/snow surfaces is enhanced by the presence of HOBr near the ice surface. The implication for atmospheric chemistry is that HOBr-ice surfaces may not provide a significant pathway to oxide S(IV) in the boundary layer due to both lower uptake coefficient and smaller HOBr surface ...Continue Reading

References

Aug 1, 1993·Microscopy Research and Technique·L F Keyser, M T Leu
Jan 7, 2003·Inorganic Chemistry·Kara E Huff HartzDale W Margerum
Apr 13, 2004·Inorganic Chemistry·Zsuzsanna Tóth, István Fábián

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Citations

Oct 23, 2020·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Nathaniel L KitzmillerHenry F Schaefer
Jul 14, 2006·The Journal of Physical Chemistry. a·Ronghua Jin, Liang T Chu
May 14, 2014·Journal of the American Chemical Society·Arpa Hudait, Valeria Molinero
Sep 1, 2006·The Journal of Physical Chemistry. a·James E Boulter, Jochen Marschall
Jul 28, 2007·The Journal of Physical Chemistry. a·Ronghua Jin, Liang T Chu

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