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Title:Comparative Analysis of urban atmospheric aerosol by particle-induced X-ray emission (PIXE), proton elastic scattering analysis (PESA), and aerosol mass spectrometry (AMS)
Authors:Johnson, K.S. (Author)
Laskin, A. (Author)
Jimenez, Jose L. (Author)
Shutthanandan, V. (Author)
Molina, Luisa T. (Author)
Salcedo, Dara (Author)
Džepina, Katja (Author)
Molina, Mario J. (Author)
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Work type:Unknown ()
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
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.
Keywords:organic aerosols, secondary organic aerosols, Mexico City, MCMA-2003 field campaign
Year of publishing:2008
Number of pages:str. 6619-6624
Numbering:iss. 17, Vol. 42
COBISS_ID:59052035 Link is opened in a new window
ISSN on article:0013-936X
DOI:10.1021/es800393e Link is opened in a new window
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Title:Environmental science & technology
Shortened title:Environ. sci. technol.
Publisher:American Chemical Society
COBISS.SI-ID:5141765 New window