In situ concentration of semi-volatile aerosol using water-condensation technology

Andrey Khlystov; Qi Zhang; Jose L Jimenez; Charlie Stanier; Spyros N Pandis; Manjula R Canagaratna; Philip Fine; Chandan Misra; Constantinos Sioutas

doi:10.1016/j.jaerosci.2004.11.005

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In situ concentration of semi-volatile aerosol using water-condensation technology

Journal article

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Peer reviewed

In situ concentration of semi-volatile aerosol using water-condensation technology

Andrey Khlystov, Qi Zhang, Jose L Jimenez, Charlie Stanier, Spyros N Pandis, Manjula R Canagaratna, Philip Fine, Chandan Misra and Constantinos Sioutas

Journal of aerosol science, Vol.36(7), pp.866-880

2005

DOI: 10.1016/j.jaerosci.2004.11.005

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Abstract

The effect of concentrating semi-volatile aerosols using a water-condensation technology was investigated using the Versatile Aerosol Concentration Enrichment System (VACES) and the Aerodyne Aerosol Mass Spectrometer (AMS) during measurements of ambient aerosol in Pittsburgh, PA. It was found that the shape of the sulfate mass-weighed size distribution was approximately preserved during passage through the concentrator for all the experiments performed, with a mass enhancement factor of about 10–20 depending on the experiment. The size distributions of organics, ammonium and nitrate were preserved on a relatively clean day (sulfate concentration around 7 μ g / m 3 ), while during more polluted conditions the concentration of these compounds, especially nitrate, was increased at small sizes after passage through the concentrator. The amount of the extra material, however, is rather small in these experiments: between 2.4% and 7.5% of the final concentrated PM mass is due to “artifact” condensation. An analysis of thermodynamic processes in the concentrator indicates that the extra particle material detected can be explained by redistribution of gas-phase material to the aerosol phase in the concentrator. The analysis shows that the condensation of extra material is expected to be larger for water-soluble semi-volatile material, such as nitrate, which agrees with the observations. The analysis also shows that artifact formation of nitrate will be more pronounced in ammonia-limited conditions and virtually undetectable in ammonia-rich conditions.

Semi-volatile aerosol

Organic aerosol

Nitrate

Particle concentrator

AMS

Details

Title: Subtitle: In situ concentration of semi-volatile aerosol using water-condensation technology
Creators: Andrey Khlystov - Department of Civil and Environmental Engineering, Duke University, Box 90287, Durham, NC 27708, USA
Qi Zhang - Department of Chemistry and CIRES, University of Colorado, Boulder, CO 80309, USA
Jose L Jimenez - Department of Chemistry and CIRES, University of Colorado, Boulder, CO 80309, USA
Charlie Stanier - Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
Spyros N Pandis - Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
Manjula R Canagaratna - Center for Aerosol and Cloud Chemistry, Aerodyne Research Inc., Billerica, MA 01821, USA
Philip Fine - Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA 90089, USA
Chandan Misra - Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA 90089, USA
Constantinos Sioutas - Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA 90089, USA
Resource Type: Journal article
Publication Details: Journal of aerosol science, Vol.36(7), pp.866-880
DOI: 10.1016/j.jaerosci.2004.11.005
ISSN: 0021-8502
eISSN: 1879-1964
Publisher: Elsevier Ltd
Language: English
Date published: 2005
Academic Unit: Chemical and Biochemical Engineering
Record Identifier: 9984003969502771

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