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Loading-dependent elemental composition of α-pinene SOA particles

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Title: Loading-dependent elemental composition of α-pinene SOA particles
Authors: J. E. Shilling, Q. Chen, S. M. King, T. Rosenoern, J. H. Kroll, D. R. Worsnop, P. F. DeCarlo, A. C. Aiken, D. Sueper, J. L. Jimenez, S. T. Martin
Source: Atmospheric Chemistry and Physics, Vol 9, Iss 3, Pp 771-782 (2009)
Publisher Information: Copernicus Publications, 2009.
Publication Year: 2009
Collection: LCC:Physics
LCC:Chemistry
Subject Terms: Physics, QC1-999, Chemistry, QD1-999
More Details: The chemical composition of secondary organic aerosol (SOA) particles, formed by the dark ozonolysis of α-pinene, was characterized by a high-resolution time-of-flight aerosol mass spectrometer. The experiments were conducted using a continuous-flow chamber, allowing the particle mass loading and chemical composition to be maintained for several days. The organic portion of the particle mass loading was varied from 0.5 to >140 μg/m3 by adjusting the concentration of reacted α-pinene from 0.9 to 91.1 ppbv. The mass spectra of the organic material changed with loading. For loadings below 5 μg/m3 the unit-mass-resolution m/z 44 (CO2+) signal intensity exceeded that of m/z 43 (predominantly C2H3O+), suggesting more oxygenated organic material at lower loadings. The composition varied more for lower loadings (0.5 to 15 μg/m3) compared to higher loadings (15 to >140 μg/m3). The high-resolution mass spectra showed that from >140 to 0.5 μg/m3 the mass percentage of fragments containing carbon and oxygen (CxHyOz+) monotonically increased from 48% to 54%. Correspondingly, the mass percentage of fragments representing CxHy+ decreased from 52% to 46%, and the atomic oxygen-to-carbon ratio increased from 0.29 to 0.45. The atomic ratios were accurately parameterized by a four-product basis set of decadal volatility (viz. 0.1, 1.0, 10, 100 μg/m3) employing products having empirical formulas of C1H1.32O0.48, C1H1.36O0.39, C1H1.57O0.24, and C1H1.76O0.14. These findings suggest considerable caution is warranted in the extrapolation of laboratory results that were obtained under conditions of relatively high loading (i.e., >15 μg/m3) to modeling applications relevant to the atmosphere, for which loadings of 0.1 to 20 μg/m3 are typical. For the lowest loadings, the particle mass spectra resembled observations reported in the literature for some atmospheric particles.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 1680-7316
1680-7324
Relation: http://www.atmos-chem-phys.net/9/771/2009/acp-9-771-2009.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324
Access URL: https://doaj.org/article/dfb42d397da242f38dc8d8e4256e4f7f
Accession Number: edsdoj.fb42d397da242f38dc8d8e4256e4f7f
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  Data: Loading-dependent elemental composition of α-pinene SOA particles
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  Data: <searchLink fieldCode="AR" term="%22J%2E+E%2E+Shilling%22">J. E. Shilling</searchLink><br /><searchLink fieldCode="AR" term="%22Q%2E+Chen%22">Q. Chen</searchLink><br /><searchLink fieldCode="AR" term="%22S%2E+M%2E+King%22">S. M. King</searchLink><br /><searchLink fieldCode="AR" term="%22T%2E+Rosenoern%22">T. Rosenoern</searchLink><br /><searchLink fieldCode="AR" term="%22J%2E+H%2E+Kroll%22">J. H. Kroll</searchLink><br /><searchLink fieldCode="AR" term="%22D%2E+R%2E+Worsnop%22">D. R. Worsnop</searchLink><br /><searchLink fieldCode="AR" term="%22P%2E+F%2E+DeCarlo%22">P. F. DeCarlo</searchLink><br /><searchLink fieldCode="AR" term="%22A%2E+C%2E+Aiken%22">A. C. Aiken</searchLink><br /><searchLink fieldCode="AR" term="%22D%2E+Sueper%22">D. Sueper</searchLink><br /><searchLink fieldCode="AR" term="%22J%2E+L%2E+Jimenez%22">J. L. Jimenez</searchLink><br /><searchLink fieldCode="AR" term="%22S%2E+T%2E+Martin%22">S. T. Martin</searchLink>
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  Data: Atmospheric Chemistry and Physics, Vol 9, Iss 3, Pp 771-782 (2009)
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  Data: Copernicus Publications, 2009.
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  Data: The chemical composition of secondary organic aerosol (SOA) particles, formed by the dark ozonolysis of α-pinene, was characterized by a high-resolution time-of-flight aerosol mass spectrometer. The experiments were conducted using a continuous-flow chamber, allowing the particle mass loading and chemical composition to be maintained for several days. The organic portion of the particle mass loading was varied from 0.5 to >140 μg/m3 by adjusting the concentration of reacted α-pinene from 0.9 to 91.1 ppbv. The mass spectra of the organic material changed with loading. For loadings below 5 μg/m3 the unit-mass-resolution m/z 44 (CO2+) signal intensity exceeded that of m/z 43 (predominantly C2H3O+), suggesting more oxygenated organic material at lower loadings. The composition varied more for lower loadings (0.5 to 15 μg/m3) compared to higher loadings (15 to >140 μg/m3). The high-resolution mass spectra showed that from >140 to 0.5 μg/m3 the mass percentage of fragments containing carbon and oxygen (CxHyOz+) monotonically increased from 48% to 54%. Correspondingly, the mass percentage of fragments representing CxHy+ decreased from 52% to 46%, and the atomic oxygen-to-carbon ratio increased from 0.29 to 0.45. The atomic ratios were accurately parameterized by a four-product basis set of decadal volatility (viz. 0.1, 1.0, 10, 100 μg/m3) employing products having empirical formulas of C1H1.32O0.48, C1H1.36O0.39, C1H1.57O0.24, and C1H1.76O0.14. These findings suggest considerable caution is warranted in the extrapolation of laboratory results that were obtained under conditions of relatively high loading (i.e., >15 μg/m3) to modeling applications relevant to the atmosphere, for which loadings of 0.1 to 20 μg/m3 are typical. For the lowest loadings, the particle mass spectra resembled observations reported in the literature for some atmospheric particles.
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  Data: http://www.atmos-chem-phys.net/9/771/2009/acp-9-771-2009.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324
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