Effect of relative humidity on the composition of secondary organic aerosol from the oxidation of toluene
| Autor: | Donald Dabdub, Sergey A. Nizkorodov, Manabu Shiraiwa, Alexander Laskin, Peng Lin, Julia Laskin, Julia Montoya-Aguilera, Mallory L. Hinks, Lucas Ellison |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Atmospheric Science
Desorption electrospray ionization 010504 meteorology & atmospheric sciences Inorganic chemistry 010501 environmental sciences Mass spectrometry behavioral disciplines and activities 01 natural sciences Toluene Toluene oxidation lcsh:QC1-999 Atmospheric Sciences Aerosol lcsh:Chemistry chemistry.chemical_compound chemistry lcsh:QD1-999 13. Climate action Meteorology & Atmospheric Sciences Relative humidity Volatility (chemistry) Chemical composition Astronomical and Space Sciences lcsh:Physics 0105 earth and related environmental sciences |
| Zdroj: | Atmospheric Chemistry and Physics, Vol 18, Pp 1643-1652 (2018) Hinks, ML; Montoya-Aguilera, J; Ellison, L; Lin, P; Laskin, A; Laskin, J; et al.(2018). Effect of relative humidity on the composition of secondary organic aerosol from the oxidation of toluene. ATMOSPHERIC CHEMISTRY AND PHYSICS, 18(3), 1643-1652. doi: 10.5194/acp-18-1643-2018. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/71s338qf Atmospheric Chemistry and Physics, vol 18, iss 3 |
| ISSN: | 1680-7324 1680-7316 |
| Popis: | The effect of relative humidity (RH) on the chemical composition of secondary organic aerosol (SOA) formed from low-NOx toluene oxidation in the absence of seed particles was investigated. SOA samples were prepared in an aerosol smog chamber at x toluene SOA. The volatility distributions of the SOA compounds, estimated from the distribution of molecular formulas using the molecular corridor approach, confirmed that low-NOx toluene SOA became more volatile on average under high-RH conditions. In contrast, the effect of RH on SOA mass loading was found to be much smaller for high-NOx toluene SOA. The observed increase in the oligomer fraction and particle mass loading under dry conditions were attributed to the enhancement of condensation reactions, which produce water and oligomers from smaller compounds in low-NOx toluene SOA. The reduction in the fraction of oligomeric compounds under humid conditions is predicted to partly counteract the previously observed enhancement in the toluene SOA yield driven by the aerosol liquid water chemistry in deliquesced inorganic seed particles. |
| Databáze: | OpenAIRE |
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