| Title: | Comparative Analysis of urban atmospheric aerosol by particle-induced X-ray emission (PIXE), proton elastic scattering analysis (PESA), and aerosol mass spectrometry (AMS) |
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| Authors: | ID Johnson, K.S. (Author)
ID Laskin, A. (Author)
ID Jimenez, Jose L. (Author)
ID Shutthanandan, V. (Author)
ID Molina, Luisa T. (Author)
ID Salcedo, Dara (Author)
ID Džepina, Katja (Author)
ID Molina, Mario J. (Author) |
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| Files: |
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | A multifaceted approach to atmospheric aerosol analysis is often desirable infield studies where an understanding of technical comparability among different measurement techniques is essential. Herein, we report quantitative intercomparisons of particle-induced X-ray emission (PIXE) and proton elastic scattering analysis (PESA), performed offline under a vacuum, with analysis by aerosol mass spectrometry (AMS) carried out in real-time during the MCMA-2003 Field Campaign in the Mexico City Metropolitan Area. Good agreement was observed for mass concentrations of PIXE-measured sulfur (assuming it was dominated by SO42-) and AMS-measured sulfate during most of the campaign. PESA-measured hydrogen mass was separated into sulfate H and organic H mass fractions, assuming the only major contributions were (NH4)(2)SO4 and organic compounds. Comparison of the organic H mass with AMS organic aerosol measurements indicates that about 75% of the mass of these species evaporated under a vacuum. However similar to 25% of the organics does remain under a vacuum, which is only possible with low-vapor-pressure compounds, and which supports the presence of high-molecular-weight or highly oxidized organics consistent with atmospheric aging. Approximately 10% of the chloride detected by AMS was measured by PIXE, possibly in the form of metal-chloride complexes, while the majority of Cl was likely present as more volatile species including NH4Cl. This is the first comparison of PIXE/PESA and AMS and, to our knowledge, also the first report of PESA hydrogen measurements for urban organic aerosols. |
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| Keywords: | organic aerosols, secondary organic aerosols, Mexico City, MCMA-2003 field campaign |
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| Year of publishing: | 2008 |
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| Number of pages: | str. 6619-6624 |
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| Numbering: | Vol. 42, iss. 17 |
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| PID: | 20.500.12556/RUNG-6459 |
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| COBISS.SI-ID: | 59052035 |
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| UDC: | 54 |
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| ISSN on article: | 0013-936X |
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| DOI: | 10.1021/es800393e |
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| NUK URN: | URN:SI:UNG:REP:6TEJUVYX |
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| Publication date in RUNG: | 11.04.2021 |
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| Views: | 2209 |
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| Downloads: | 0 |
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