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Title: Organic and inorganic decomposition products from the thermal desorption of atmospheric particles

Abstract

Here, atmospheric aerosol composition is often analyzed using thermal desorption techniques to evaporate samples and deliver organic or inorganic molecules to various designs of detectors for identification and quantification. The organic aerosol (OA) fraction is composed of thousands of individual compounds, some with nitrogen- and sulfur-containing functionality and, often contains oligomeric material, much of which may be susceptible to decomposition upon heating. Here we analyze thermal decomposition products as measured by a thermal desorption aerosol gas chromatograph (TAG) capable of separating thermal decomposition products from thermally stable molecules. The TAG impacts particles onto a collection and thermal desorption (CTD) cell, and upon completion of sample collection, heats and transfers the sample in a helium flow up to 310 °C. Desorbed molecules are refocused at the head of a gas chromatography column that is held at 45 °C and any volatile decomposition products pass directly through the column and into an electron impact quadrupole mass spectrometer. Analysis of the sample introduction (thermal decomposition) period reveals contributions of NO+ (m/z 30), NO2+ (m/z 46), SO+ (m/z 48), and SO2+ (m/z 64), derived from either inorganic or organic particle-phase nitrate and sulfate. CO2+ (m/z 44) makes up a major component of the decomposition signal, along withmore » smaller contributions from other organic components that vary with the type of aerosol contributing to the signal (e.g., m/z 53, 82 observed here for isoprene-derived secondary OA). All of these ions are important for ambient aerosol analyzed with the aerosol mass spectrometer (AMS), suggesting similarity of the thermal desorption processes in both instruments. Ambient observations of these decomposition products compared to organic, nitrate, and sulfate mass concentrations measured by an AMS reveal good correlation, with improved correlations for OA when compared to the AMS oxygenated OA (OOA) component. TAG signal found in the traditional compound elution time period reveals higher correlations with AMS hydrocarbon-like OA (HOA) combined with the fraction of OOA that is less oxygenated. Potential to quantify nitrate and sulfate aerosol mass concentrations using the TAG system is explored through analysis of ammonium sulfate and ammonium nitrate standards. While chemical standards display a linear response in the TAG system, redesorptions of the CTD cell following ambient sample analysis show some signal carryover on sulfate and organics, and new desorption methods should be developed to improve throughput. Future standards should be composed of complex organic/inorganic mixtures, similar to what is found in the atmosphere, and perhaps will more accurately account for any aerosol mixture effects on compositional quantification.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [5]
  1. Washington Univ., St. Louis, MO (United States)
  2. Aerosol Dynamics Inc., Berkeley, CA (United States)
  3. Univ. of California, Berkeley, CA (United States)
  4. EPA Office of Research and Development, Research Triangle Park, NC (United States); Univ. of Colorado, Boulder, CO (United States)
  5. Univ. of Colorado, Boulder, CO (United States)
Publication Date:
Research Org.:
Univ. of Colorado, Denver, CO (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1257994
Grant/Contract Number:  
SC0011105
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Measurement Techniques (Online)
Additional Journal Information:
Journal Name: Atmospheric Measurement Techniques (Online); Journal Volume: 9; Journal Issue: 4; Related Information: The Supplement related to this article is available onlineat doi:10.5194/amt-9-1569-2016-supplement.; Journal ID: ISSN 1867-8548
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Williams, Brent J., Zhang, Yaping, Zuo, Xiaochen, Martinez, Raul E., Walker, Michael J., Kreisberg, Nathan M., Goldstein, Allen H., Docherty, Kenneth S., and Jimenez, Jose L. Organic and inorganic decomposition products from the thermal desorption of atmospheric particles. United States: N. p., 2016. Web. doi:10.5194/amt-9-1569-2016.
Williams, Brent J., Zhang, Yaping, Zuo, Xiaochen, Martinez, Raul E., Walker, Michael J., Kreisberg, Nathan M., Goldstein, Allen H., Docherty, Kenneth S., & Jimenez, Jose L. Organic and inorganic decomposition products from the thermal desorption of atmospheric particles. United States. https://doi.org/10.5194/amt-9-1569-2016
Williams, Brent J., Zhang, Yaping, Zuo, Xiaochen, Martinez, Raul E., Walker, Michael J., Kreisberg, Nathan M., Goldstein, Allen H., Docherty, Kenneth S., and Jimenez, Jose L. Mon . "Organic and inorganic decomposition products from the thermal desorption of atmospheric particles". United States. https://doi.org/10.5194/amt-9-1569-2016. https://www.osti.gov/servlets/purl/1257994.
@article{osti_1257994,
title = {Organic and inorganic decomposition products from the thermal desorption of atmospheric particles},
author = {Williams, Brent J. and Zhang, Yaping and Zuo, Xiaochen and Martinez, Raul E. and Walker, Michael J. and Kreisberg, Nathan M. and Goldstein, Allen H. and Docherty, Kenneth S. and Jimenez, Jose L.},
abstractNote = {Here, atmospheric aerosol composition is often analyzed using thermal desorption techniques to evaporate samples and deliver organic or inorganic molecules to various designs of detectors for identification and quantification. The organic aerosol (OA) fraction is composed of thousands of individual compounds, some with nitrogen- and sulfur-containing functionality and, often contains oligomeric material, much of which may be susceptible to decomposition upon heating. Here we analyze thermal decomposition products as measured by a thermal desorption aerosol gas chromatograph (TAG) capable of separating thermal decomposition products from thermally stable molecules. The TAG impacts particles onto a collection and thermal desorption (CTD) cell, and upon completion of sample collection, heats and transfers the sample in a helium flow up to 310 °C. Desorbed molecules are refocused at the head of a gas chromatography column that is held at 45 °C and any volatile decomposition products pass directly through the column and into an electron impact quadrupole mass spectrometer. Analysis of the sample introduction (thermal decomposition) period reveals contributions of NO+ (m/z 30), NO2+ (m/z 46), SO+ (m/z 48), and SO2+ (m/z 64), derived from either inorganic or organic particle-phase nitrate and sulfate. CO2+ (m/z 44) makes up a major component of the decomposition signal, along with smaller contributions from other organic components that vary with the type of aerosol contributing to the signal (e.g., m/z 53, 82 observed here for isoprene-derived secondary OA). All of these ions are important for ambient aerosol analyzed with the aerosol mass spectrometer (AMS), suggesting similarity of the thermal desorption processes in both instruments. Ambient observations of these decomposition products compared to organic, nitrate, and sulfate mass concentrations measured by an AMS reveal good correlation, with improved correlations for OA when compared to the AMS oxygenated OA (OOA) component. TAG signal found in the traditional compound elution time period reveals higher correlations with AMS hydrocarbon-like OA (HOA) combined with the fraction of OOA that is less oxygenated. Potential to quantify nitrate and sulfate aerosol mass concentrations using the TAG system is explored through analysis of ammonium sulfate and ammonium nitrate standards. While chemical standards display a linear response in the TAG system, redesorptions of the CTD cell following ambient sample analysis show some signal carryover on sulfate and organics, and new desorption methods should be developed to improve throughput. Future standards should be composed of complex organic/inorganic mixtures, similar to what is found in the atmosphere, and perhaps will more accurately account for any aerosol mixture effects on compositional quantification.},
doi = {10.5194/amt-9-1569-2016},
journal = {Atmospheric Measurement Techniques (Online)},
number = 4,
volume = 9,
place = {United States},
year = {Mon Apr 11 00:00:00 EDT 2016},
month = {Mon Apr 11 00:00:00 EDT 2016}
}

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