heterogeneous photochemistry of imidazole-2-carboxaldehyde: ho2 radical formation and aerosol growth
Clicks: 172
ID: 188723
2016
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This
article has not been analysed, so there is no overall score —
reader engagement is measured and shown alongside.
Reader Engagement
Steady Performance
30.0
/100
172 views
30 readers
AI Quality Assessment
Not analyzed
Readership in this journal
SteadyRanked #312 of 850 articles by views in Journal of agricultural and food chemistry
Most read
Least read
Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 850 in total.
Mint this article as an NFT
Not yet mintedCreate a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.
5
SUSD
one-off · no wallet required
Abstract
The multiphase chemistry of glyoxal is a source of secondary organic aerosol
(SOA), including its light-absorbing product imidazole-2-carboxaldehyde (IC).
IC is a photosensitizer that can contribute to additional aerosol ageing and
growth when its excited triplet state oxidizes hydrocarbons (reactive uptake)
via H-transfer chemistry. We have conducted a series of photochemical
coated-wall flow tube (CWFT) experiments using films of IC and citric acid
(CA), an organic proxy and H donor
in the condensed phase. The formation rate of gas-phase HO2 radicals
(PHO2) was measured indirectly by converting gas-phase NO into
NO2. We report on experiments that relied on measurements of NO2
formation, NO loss and HONO formation. PHO2 was found to be a
linear function of (1) the [IC] × [CA] concentration product and
(2) the photon actinic flux. Additionally, (3) a more complex function of
relative humidity (25 % < RH < 63 %) and of (4) the
O2 ∕ N2 ratio
(15 % < O2 ∕ N2 < 56 %) was observed, most
likely indicating competing effects of dilution, HO2 mobility and losses
in the film. The maximum PHO2 was observed at 25–55 % RH
and at ambient O2 ∕ N2. The HO2 radicals form in the
condensed phase when excited IC triplet states are reduced by H transfer from
a donor, CA in our system, and subsequently react with O2 to regenerate
IC, leading to a catalytic cycle. OH does not appear to be formed as a
primary product but is produced from the reaction of NO with HO2 in the
gas phase. Further, seed aerosols containing IC and ammonium sulfate were
exposed to gas-phase limonene and NOx in aerosol flow tube experiments,
confirming significant PHO2 from aerosol surfaces. Our results
indicate a potentially relevant contribution of triplet state photochemistry
for gas-phase HO2 production, aerosol growth and ageing in the
atmosphere.
| Reference Key |
palacios2016atmosphericheterogeneous
Use this key to autocite in the manuscript while using
SciMatic Manuscript Manager or Thesis Manager
|
|---|---|
| Authors | ;L. González Palacios;L. González Palacios;P. Corral Arroyo;P. Corral Arroyo;K. Z. Aregahegn;K. Z. Aregahegn;S. S. Steimer;S. S. Steimer;S. S. Steimer;T. Bartels-Rausch;B. Nozière;C. George;M. Ammann;R. Volkamer;R. Volkamer |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-11823-2016
|
| URL | |
| Keywords |
Citations
No citations found. To add a citation, contact the admin at info@scimatic.org
Comments
No comments yet. Be the first to comment on this article.