Secondary organic aerosol formation from photochemical aging of light-duty gasoline vehicle exhausts in a smog chamber
In China, a rapid increase in passenger vehicles has led to the growing concern of vehicle exhaust as an important source of anthropogenic secondary organic aerosol (SOA) in megacities hard hit by haze. In this study, the SOA formation of emissions from two idling light-duty gasoline vehicles (LDGVs...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2015-08-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/15/9049/2015/acp-15-9049-2015.pdf |
| _version_ | 1818557777367269376 |
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| author | T. Liu X. Wang W. Deng Q. Hu X. Ding Y. Zhang Q. He Z. Zhang S. Lü X. Bi J. Chen J. Yu |
| author_facet | T. Liu X. Wang W. Deng Q. Hu X. Ding Y. Zhang Q. He Z. Zhang S. Lü X. Bi J. Chen J. Yu |
| author_sort | T. Liu |
| collection | DOAJ |
| description | In China, a rapid increase in passenger vehicles has led to the growing
concern of vehicle exhaust as an important source of anthropogenic secondary
organic aerosol (SOA) in megacities hard hit by haze. In this study, the SOA
formation of emissions from two idling light-duty gasoline vehicles (LDGVs)
(Euro 1 and Euro 4) operated in China was investigated in a 30 m<sup>3</sup> smog
chamber. Five photo-oxidation experiments were carried out at 25 °C
with relative humidity at around 50 %. After aging at an OH exposure of
5 × 10<sup>6</sup> molecules cm<sup>−3</sup> h, the formed SOA was 12–259
times as high as primary organic aerosol (POA). The SOA production factors
(PF) were 0.001–0.044 g kg<sup>−1</sup> fuel, comparable with those from the
previous studies at comparable OH exposure. This quite lower OH exposure than
that in typical atmospheric conditions might however lead to the
underestimation of the SOA formation potential from LDGVs. Effective SOA
yields in this study were well fit by a one-product gas-particle partitioning
model but quite lower than those of a previous study investigating SOA
formation from three idling passenger vehicles (Euro 2–4). Traditional
single-ring aromatic precursors and naphthalene could explain 51–90 % of
the formed SOA. Unspeciated species such as branched and cyclic alkanes might
be the possible precursors for the unexplained SOA. A high-resolution
time-of-flight aerosol mass spectrometer was used to characterize the
chemical composition of SOA. The relationship between <i>f</i><sub>43</sub> (ratio of
<i>m/z</i> 43, mostly C<sub>2</sub>H<sub>3</sub>O<sup>+</sup>, to the total signal in mass spectrum)
and <i>f</i><sub>44</sub> (mostly CO<sub>2</sub><sup>+</sup>) of the gasoline vehicle exhaust SOA is
similar to the ambient semi-volatile oxygenated organic aerosol (SV-OOA). We
plot the O : C and H : C molar ratios of SOA in a Van Krevelen diagram.
The slopes of ΔH : C / ΔO : C ranged from −0.59 to
−0.36, suggesting that the oxidation chemistry in these experiments was a
combination of carboxylic acid and alcohol/peroxide formation. |
| first_indexed | 2024-12-14T00:04:02Z |
| format | Article |
| id | doaj.art-1e82bc6d05ca4af7bac1dcd2fdf41ff0 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-14T00:04:02Z |
| publishDate | 2015-08-01 |
| publisher | Copernicus Publications |
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| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-1e82bc6d05ca4af7bac1dcd2fdf41ff02022-12-21T23:26:09ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242015-08-0115159049906210.5194/acp-15-9049-2015Secondary organic aerosol formation from photochemical aging of light-duty gasoline vehicle exhausts in a smog chamberT. Liu0X. Wang1W. Deng2Q. Hu3X. Ding4Y. Zhang5Q. He6Z. Zhang7S. Lü8X. Bi9J. Chen10J. Yu11State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, ChinaShanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, ChinaDivision of Environment, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, ChinaIn China, a rapid increase in passenger vehicles has led to the growing concern of vehicle exhaust as an important source of anthropogenic secondary organic aerosol (SOA) in megacities hard hit by haze. In this study, the SOA formation of emissions from two idling light-duty gasoline vehicles (LDGVs) (Euro 1 and Euro 4) operated in China was investigated in a 30 m<sup>3</sup> smog chamber. Five photo-oxidation experiments were carried out at 25 °C with relative humidity at around 50 %. After aging at an OH exposure of 5 × 10<sup>6</sup> molecules cm<sup>−3</sup> h, the formed SOA was 12–259 times as high as primary organic aerosol (POA). The SOA production factors (PF) were 0.001–0.044 g kg<sup>−1</sup> fuel, comparable with those from the previous studies at comparable OH exposure. This quite lower OH exposure than that in typical atmospheric conditions might however lead to the underestimation of the SOA formation potential from LDGVs. Effective SOA yields in this study were well fit by a one-product gas-particle partitioning model but quite lower than those of a previous study investigating SOA formation from three idling passenger vehicles (Euro 2–4). Traditional single-ring aromatic precursors and naphthalene could explain 51–90 % of the formed SOA. Unspeciated species such as branched and cyclic alkanes might be the possible precursors for the unexplained SOA. A high-resolution time-of-flight aerosol mass spectrometer was used to characterize the chemical composition of SOA. The relationship between <i>f</i><sub>43</sub> (ratio of <i>m/z</i> 43, mostly C<sub>2</sub>H<sub>3</sub>O<sup>+</sup>, to the total signal in mass spectrum) and <i>f</i><sub>44</sub> (mostly CO<sub>2</sub><sup>+</sup>) of the gasoline vehicle exhaust SOA is similar to the ambient semi-volatile oxygenated organic aerosol (SV-OOA). We plot the O : C and H : C molar ratios of SOA in a Van Krevelen diagram. The slopes of ΔH : C / ΔO : C ranged from −0.59 to −0.36, suggesting that the oxidation chemistry in these experiments was a combination of carboxylic acid and alcohol/peroxide formation.http://www.atmos-chem-phys.net/15/9049/2015/acp-15-9049-2015.pdf |
| spellingShingle | T. Liu X. Wang W. Deng Q. Hu X. Ding Y. Zhang Q. He Z. Zhang S. Lü X. Bi J. Chen J. Yu Secondary organic aerosol formation from photochemical aging of light-duty gasoline vehicle exhausts in a smog chamber Atmospheric Chemistry and Physics |
| title | Secondary organic aerosol formation from photochemical aging of light-duty gasoline vehicle exhausts in a smog chamber |
| title_full | Secondary organic aerosol formation from photochemical aging of light-duty gasoline vehicle exhausts in a smog chamber |
| title_fullStr | Secondary organic aerosol formation from photochemical aging of light-duty gasoline vehicle exhausts in a smog chamber |
| title_full_unstemmed | Secondary organic aerosol formation from photochemical aging of light-duty gasoline vehicle exhausts in a smog chamber |
| title_short | Secondary organic aerosol formation from photochemical aging of light-duty gasoline vehicle exhausts in a smog chamber |
| title_sort | secondary organic aerosol formation from photochemical aging of light duty gasoline vehicle exhausts in a smog chamber |
| url | http://www.atmos-chem-phys.net/15/9049/2015/acp-15-9049-2015.pdf |
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