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Role of Chromium and Vanadium in the Atmospheric Oxidation of Sulfur(IV)

Brandt, Christian and Elding, Lars Ivar LU (1998) In Atmospheric Environment 32(4). p.797-800
Abstract
Oxidation of HSO3- in aqueous solution has been studied in the presence of vanadium(V), chromium(III) and chromium(VI). Based on spectrophotometric kinetics data and product analysis it is concluded that the autoxidation rate of sulfur(IV) in slightly acidic solution is unaffected by the presence of vanadium(V) and chromium(III). Chromate(VI), on the other hand, oxidizes sulfur(IV) in a direct redox process in acidic solution. The overall rate of this reaction decreases with increasing pH and it becomes relatively slow in the atmospherically relevant pH range 4-6. Moreover, chromium(III) dominates strongly over chromium(VI) in the atmospheric aqueous phase. Hence, it is concluded that cations of vanadium vanadium and chromium have no... (More)
Oxidation of HSO3- in aqueous solution has been studied in the presence of vanadium(V), chromium(III) and chromium(VI). Based on spectrophotometric kinetics data and product analysis it is concluded that the autoxidation rate of sulfur(IV) in slightly acidic solution is unaffected by the presence of vanadium(V) and chromium(III). Chromate(VI), on the other hand, oxidizes sulfur(IV) in a direct redox process in acidic solution. The overall rate of this reaction decreases with increasing pH and it becomes relatively slow in the atmospherically relevant pH range 4-6. Moreover, chromium(III) dominates strongly over chromium(VI) in the atmospheric aqueous phase. Hence, it is concluded that cations of vanadium vanadium and chromium have no significant influence on the atmospheric aqueous-phase oxidation of sulfur(IV) under most ambient atmospheric conditions. Only in very acidic droplets, direct redox between chromium(VI) and sulfite might be of some importance. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Transition metals, Atmospheric oxidation, Sulfur(IV), tropospheric aqueous phase, transition metals, troposheric aqueous phase, catalysis, kinetics, sulfur(IV) oxidation, atmospheric chemistry, Reaction mechanism
in
Atmospheric Environment
volume
32
issue
4
pages
4 pages
publisher
Elsevier
external identifiers
  • scopus:0032005323
ISSN
1352-2310
DOI
10.1016/S1352-2310(97)00331-2
language
English
LU publication?
yes
id
92178d89-afd1-403d-ab90-fb7363cf3b59
date added to LUP
2016-12-27 19:02:32
date last changed
2017-03-20 21:27:34
@article{92178d89-afd1-403d-ab90-fb7363cf3b59,
  abstract     = {Oxidation of HSO3- in aqueous solution has been studied in the presence of vanadium(V), chromium(III) and chromium(VI). Based on spectrophotometric kinetics data and product analysis it is concluded that the autoxidation rate of sulfur(IV) in slightly acidic solution is unaffected by the presence of vanadium(V) and chromium(III). Chromate(VI), on the other hand, oxidizes sulfur(IV) in a direct redox process in acidic solution. The overall rate of this reaction decreases with increasing pH and it becomes relatively slow in the atmospherically relevant pH range 4-6. Moreover, chromium(III) dominates strongly over chromium(VI) in the atmospheric aqueous phase. Hence, it is concluded that cations of vanadium vanadium and chromium have no significant influence on the atmospheric aqueous-phase oxidation of sulfur(IV) under most ambient atmospheric conditions. Only in very acidic droplets, direct redox between chromium(VI) and sulfite might be of some importance. },
  author       = {Brandt, Christian and Elding, Lars Ivar},
  issn         = {1352-2310},
  keyword      = {Transition metals,Atmospheric oxidation,Sulfur(IV),tropospheric aqueous phase,transition metals,troposheric aqueous phase,catalysis,kinetics,sulfur(IV) oxidation,atmospheric chemistry,Reaction mechanism},
  language     = {eng},
  number       = {4},
  pages        = {797--800},
  publisher    = {Elsevier},
  series       = {Atmospheric Environment},
  title        = {Role of Chromium and Vanadium in the Atmospheric Oxidation of Sulfur(IV)},
  url          = {http://dx.doi.org/10.1016/S1352-2310(97)00331-2},
  volume       = {32},
  year         = {1998},
}