Cargando…
Influence of metal-mediated aerosol-phase oxidation on secondary organic aerosol formation from the ozonolysis and OH-oxidation of α-pinene
The organic component is the most abundant fraction of atmospheric submicron particles, while the formation mechanisms of secondary organic aerosol (SOA) are not fully understood. The effects of sulfate seed aerosols on SOA formation were investigated with a series of experiments carried out using a...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2017
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5216392/ https://www.ncbi.nlm.nih.gov/pubmed/28059151 http://dx.doi.org/10.1038/srep40311 |
_version_ | 1782491918776664064 |
---|---|
author | Chu, Biwu Liggio, John Liu, Yongchun He, Hong Takekawa, Hideto Li, Shao-Meng Hao, Jiming |
author_facet | Chu, Biwu Liggio, John Liu, Yongchun He, Hong Takekawa, Hideto Li, Shao-Meng Hao, Jiming |
author_sort | Chu, Biwu |
collection | PubMed |
description | The organic component is the most abundant fraction of atmospheric submicron particles, while the formation mechanisms of secondary organic aerosol (SOA) are not fully understood. The effects of sulfate seed aerosols on SOA formation were investigated with a series of experiments carried out using a 9 m(3) smog chamber. The presence of FeSO(4) or Fe(2)(SO(4))(3) seed aerosols decreased SOA yields and increased oxidation levels in both ozonolysis and OH-oxidation of α-pinene compared to that in the presence of ZnSO(4) or (NH(4))(2)SO(4). These findings were explained by metal-mediated aerosol-phase oxidation of organics: reactive radicals were generated on FeSO(4) or Fe(2)(SO(4))(3) seed aerosols and reacted further with the organic mass. This effect would help to explain the high O/C ratios of organics in ambient particles that thus far cannot be reproduced in laboratory and model studies. In addition, the gap in the SOA yields between experiments with different seed aerosols was more significant in OH-oxidation experiments compared to ozonolysis experiments, while the gap in estimated O/C ratios was less obvious. This may have resulted from the different chemical compositions and oxidation levels of the SOA generated in the two systems, which affect the branching ratio of functionalization and fragmentation during aerosol oxidation. |
format | Online Article Text |
id | pubmed-5216392 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-52163922017-01-10 Influence of metal-mediated aerosol-phase oxidation on secondary organic aerosol formation from the ozonolysis and OH-oxidation of α-pinene Chu, Biwu Liggio, John Liu, Yongchun He, Hong Takekawa, Hideto Li, Shao-Meng Hao, Jiming Sci Rep Article The organic component is the most abundant fraction of atmospheric submicron particles, while the formation mechanisms of secondary organic aerosol (SOA) are not fully understood. The effects of sulfate seed aerosols on SOA formation were investigated with a series of experiments carried out using a 9 m(3) smog chamber. The presence of FeSO(4) or Fe(2)(SO(4))(3) seed aerosols decreased SOA yields and increased oxidation levels in both ozonolysis and OH-oxidation of α-pinene compared to that in the presence of ZnSO(4) or (NH(4))(2)SO(4). These findings were explained by metal-mediated aerosol-phase oxidation of organics: reactive radicals were generated on FeSO(4) or Fe(2)(SO(4))(3) seed aerosols and reacted further with the organic mass. This effect would help to explain the high O/C ratios of organics in ambient particles that thus far cannot be reproduced in laboratory and model studies. In addition, the gap in the SOA yields between experiments with different seed aerosols was more significant in OH-oxidation experiments compared to ozonolysis experiments, while the gap in estimated O/C ratios was less obvious. This may have resulted from the different chemical compositions and oxidation levels of the SOA generated in the two systems, which affect the branching ratio of functionalization and fragmentation during aerosol oxidation. Nature Publishing Group 2017-01-06 /pmc/articles/PMC5216392/ /pubmed/28059151 http://dx.doi.org/10.1038/srep40311 Text en Copyright © 2017, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Chu, Biwu Liggio, John Liu, Yongchun He, Hong Takekawa, Hideto Li, Shao-Meng Hao, Jiming Influence of metal-mediated aerosol-phase oxidation on secondary organic aerosol formation from the ozonolysis and OH-oxidation of α-pinene |
title | Influence of metal-mediated aerosol-phase oxidation on secondary organic aerosol formation from the ozonolysis and OH-oxidation of α-pinene |
title_full | Influence of metal-mediated aerosol-phase oxidation on secondary organic aerosol formation from the ozonolysis and OH-oxidation of α-pinene |
title_fullStr | Influence of metal-mediated aerosol-phase oxidation on secondary organic aerosol formation from the ozonolysis and OH-oxidation of α-pinene |
title_full_unstemmed | Influence of metal-mediated aerosol-phase oxidation on secondary organic aerosol formation from the ozonolysis and OH-oxidation of α-pinene |
title_short | Influence of metal-mediated aerosol-phase oxidation on secondary organic aerosol formation from the ozonolysis and OH-oxidation of α-pinene |
title_sort | influence of metal-mediated aerosol-phase oxidation on secondary organic aerosol formation from the ozonolysis and oh-oxidation of α-pinene |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5216392/ https://www.ncbi.nlm.nih.gov/pubmed/28059151 http://dx.doi.org/10.1038/srep40311 |
work_keys_str_mv | AT chubiwu influenceofmetalmediatedaerosolphaseoxidationonsecondaryorganicaerosolformationfromtheozonolysisandohoxidationofapinene AT liggiojohn influenceofmetalmediatedaerosolphaseoxidationonsecondaryorganicaerosolformationfromtheozonolysisandohoxidationofapinene AT liuyongchun influenceofmetalmediatedaerosolphaseoxidationonsecondaryorganicaerosolformationfromtheozonolysisandohoxidationofapinene AT hehong influenceofmetalmediatedaerosolphaseoxidationonsecondaryorganicaerosolformationfromtheozonolysisandohoxidationofapinene AT takekawahideto influenceofmetalmediatedaerosolphaseoxidationonsecondaryorganicaerosolformationfromtheozonolysisandohoxidationofapinene AT lishaomeng influenceofmetalmediatedaerosolphaseoxidationonsecondaryorganicaerosolformationfromtheozonolysisandohoxidationofapinene AT haojiming influenceofmetalmediatedaerosolphaseoxidationonsecondaryorganicaerosolformationfromtheozonolysisandohoxidationofapinene |