Articles | Volume 19, issue 15
Atmos. Chem. Phys., 19, 9887–9902, 2019
https://doi.org/10.5194/acp-19-9887-2019

Special issue: Multiphase chemistry of secondary aerosol formation under...

Atmos. Chem. Phys., 19, 9887–9902, 2019
https://doi.org/10.5194/acp-19-9887-2019

Research article 07 Aug 2019

Research article | 07 Aug 2019

Photochemical aging of atmospherically reactive organic compounds involving brown carbon at the air–aqueous interface

Siyang Li et al.

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Cited articles

Ackendorf, J. M., Ippolito, M. G., and Galloway, M. M.: pH Dependence of the Imidazole-2-carboxaldehyde Hydration Equilibrium: Implications for Atmospheric Light Absorbance, Environ. Sci. Tech. Let., 4, 551–555, https://doi.org/10.1021/acs.estlett.7b00486, 2017. 
Adams, E. M., Verreault, D., Jayarathne, T., Cochran, R. E., Stone, E. A., and Allen, H. C.: Surface organization of a DPPC monolayer on concentrated SrCl2 and ZnCl2 solutions, Phys. Chem. Chem. Phys., 18, 32345–32357, https://doi.org/10.1039/c6cp06887a, 2016. 
Adams, E. M., Wellen, B. A., Thiraux, R., Reddy, S. K., Vidalis, A. S., Paesani, F., and Allen, H. C.: Sodium-carboxylate contact ion pair formation induces stabilization of palmitic acid monolayers at high pH, Phys. Chem. Chem. Phys., 19, 10481–10490, https://doi.org/10.1039/c7cp00167c, 2017. 
Aguer, J. P., Richard, C., and Andreux, F.: Effect of light on humic substances: Production of reactive species, Analusis, 27, 387–390, https://doi.org/10.1051/analusis:1999270387, 1999. 
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We stimulated the photochemical aging of organic film coated on aqueous aerosol in the presence of imidazole-2-carboxaldehyde, humic acid, an atmospheric PM2.5 sample, and a secondary organic aerosol sample from the lab. The unsaturated lipid mixed with photosensitizer under UV irradiation produced hydroperoxides, leading to surface area increase in organic film. Our results reveal the modification of organic film on aqueous aerosol has potential influence on the hygroscopic growth of droplets.
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