Optical properties of the products of α-dicarbonyl and amine reactions in simulated cloud droplets.

@article{Zarzana2012OpticalPO,
  title={Optical properties of the products of $\alpha$-dicarbonyl and amine reactions in simulated cloud droplets.},
  author={Kyle J. Zarzana and David O. De Haan and Miriam Arak Freedman and Christa A. Hasenkopf and Margaret A. Tolbert},
  journal={Environmental science \& technology},
  year={2012},
  volume={46 9},
  pages={
          4845-51
        }
}
Secondary organic aerosol makes up a significant fraction of the total aerosol mass, and a growing body of evidence indicates that reactions in the atmospheric aqueous phase are important contributors to aerosol formation and can help explain observations that cannot be accounted for using traditional gas-phase chemistry. In particular, aqueous phase reactions between small organic molecules have been proposed as a source of light absorbing compounds that have been observed in numerous… 

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References

SHOWING 1-10 OF 36 REFERENCES
Aqueous chemistry and its role in secondary organic aerosol (SOA) formation
Abstract. There is a growing understanding that secondary organic aerosol (SOA) can form through reactions in atmospheric waters (i.e., clouds, fogs, and aerosol water). In clouds and wet aerosols,
Secondary organic material formed by methylglyoxal in aqueous aerosol mimics
Abstract. We show that methylglyoxal forms light-absorbing secondary organic material in aqueous ammonium sulfate and ammonium nitrate solutions mimicking tropospheric aerosol particles. The kinetics
Light-absorbing secondary organic material formed by glyoxal in aqueous aerosol mimics
Abstract. Light-absorbing and high-molecular-weight secondary organic products were observed to result from the reaction of glyoxal in mildly acidic (pH=4) aqueous inorganic salt solutions mimicking
Secondary organic aerosol formation in cloud droplets and aqueous particles (aqSOA): a review of laboratory, field and model studies
Abstract. Progress has been made over the past decade in predicting secondary organic aerosol (SOA) mass in the atmosphere using vapor pressure-driven partitioning, which implies that SOA compounds
Formation of nitrogen-containing oligomers by methylglyoxal and amines in simulated evaporating cloud droplets.
TLDR
Measured elemental ratios are consistent with imidazoles and oligomers being major reaction products, while effective aerosol densities suggest extensive reactions take place within minutes, which may be a source of the light- absorbing, nitrogen-containing oligomers observed in urban and biomass-burning aerosol particles.
Organic reactions increasing the absorption index of atmospheric sulfuric acid aerosols
[1] Unlike most environments present at Earth's surface atmospheric aerosols can be favorable to organic reactions. Among them, the acid-catalyzed aldol condensation of aldehydes and ketones produces
Secondary organic aerosol-forming reactions of glyoxal with amino acids.
TLDR
Comparison of reaction kinetics in bulk and in drying droplets shows that conversion of glyoxal dihydrate to monohydrate accelerates the reaction by over 3 orders of magnitude, allowing these reactions to occur at atmospheric conditions.
Atmospheric condensed‐phase reactions of glyoxal with methylamine
[1] Glyoxal reacts with methylamine in drying cloud droplet/aerosol surrogates to form high molecular mass oligomers along with smaller amounts of 1,3-dimethylimidazole and light-absorbing compounds.
Optical properties of internally mixed aerosol particles composed of dicarboxylic acids and ammonium sulfate.
TLDR
The optical properties of internally mixed aerosol particles composed of dicarboxylic acids and ammonium sulfate are investigated using cavity ring-down aerosol extinction spectroscopy and it is likely that complex particle morphologies are responsible for the observed behavior of the mixed particles.
Evidence for high molecular weight nitrogen-containing organic salts in urban aerosols.
TLDR
High molecular weight species were observed at substantial intensities in the positive-ion mass spectra in urban Shanghai aerosols collected from a single-particle time-of-flight mass spectrometer during three separate periods over 2007-2009, suggesting that C-N bonds are prevalent and that the observed high-M(w) species are potentially nitrogen-containing organic salts.
...
1
2
3
4
...