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Importance of formaldehyde in cloud chemistryA physical-chemical model which is an extension of that of Hong and Carmichael (1983) is used to investigate the role of formaldehyde in cloud chemistry. This model takes into account the mass transfer of SO2, O3, NH3, HNO3, H2O2, CO2, HCl, HCHO, O2, OH and HO2 into cloud droplets and their subsequent chemical reactions. The model is used to assess the importance of S(IV)-HCHO adduct formation, the reduction of H2O2 by HCHO, HCHO-free radical interactions, and the formation of HCOOH in the presence of HCHO in cloud droplets. Illustrative calculations indicate that the presence of HCHO inhibits sulfate production rate in cloud droplets. The direct inhibition of sulfate production rate in cloudwater due to nucleophilic addition of HSO3(-) to HCHO(aq) to form hydroxymethanesulfonate is generally low for concentrations of HCHO typical of ambient air. However, inhibition of sulfate production due to formaldehyde-free radical interactions in solution can be important. These formaldehyde-free radical reactions can also generate appreciable quantities of formic acid.
Document ID
19850035061
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Adewuyi, Y. G.
(Iowa Univ. Iowa City, IA, United States)
Cho, S.-Y.
(Iowa Univ. Iowa City, IA, United States)
Tsay, R.-P.
(Iowa Univ. Iowa City, IA, United States)
Carmichael, G. R.
(Iowa, University Iowa City, IA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Publication Information
Publication: Atmospheric Environment
Volume: 18
Issue: 11 1
ISSN: 0004-6981
Subject Category
Inorganic And Physical Chemistry
Accession Number
85A17212
Funding Number(s)
CONTRACT_GRANT: NAG1-36
Distribution Limits
Public
Copyright
Other

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