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Title: Ion mobility spectrometry–mass spectrometry (IMS–MS) for on- and offline analysis of atmospheric gas and aerosol species

Journal Article · · Atmospheric Measurement Techniques (Online)
 [1];  [2];  [3];  [4];  [3];  [5];  [6];  [2];  [2];  [7];  [8];  [9];  [10];  [2];  [3];  [11];  [1];  [3]
  1. Cooperative Institute for Research in Environmental Sciences (CIRES), Boulder, CO (United States); Univ. of Colorado, Boulder, CO (United States)
  2. TOFWERK, Thun (Switzerland)
  3. Aerodyne Research, Billerica, MA (United States)
  4. Univ. of Helsinki, Helsinki (Finland)
  5. Aerodyne Research, Billerica, MA (United States); Boston College, Chestnut Hill, MA (United States)
  6. TOFWERK, Thun (Switzerland); Aerodyne Research, Billerica, MA (United States)
  7. The Univ. of North Carolina, Chapel Hill, NC (United States); Univ. of Michigan, Ann Arbor, MI (United States)
  8. The Univ. of North Carolina, Chapel Hill, NC (United States); Nanyang Technological Univ. (Singapore)
  9. The Univ. of North Carolina, Chapel Hill, NC (United States); Univ. of California, Berkeley, CA (United States)
  10. The Univ. of North Carolina, Chapel Hill, NC (United States)
  11. Aerodyne Research, Billerica, MA (United States); Univ. of Helsinki, Helsinki (Finland)

Measurement techniques that provide molecular-level information are needed to elucidate the multiphase processes that produce secondary organic aerosol (SOA) species in the atmosphere. Here we demonstrate the application of ion mobility spectrometry-mass spectrometry (IMS–MS) to the simultaneous characterization of the elemental composition and molecular structures of organic species in the gas and particulate phases. Molecular ions of gas-phase organic species are measured online with IMS–MS after ionization with a custom-built nitrate chemical ionization (CI) source. This CI–IMS–MS technique is used to obtain time-resolved measurements (5 min) of highly oxidized organic molecules during the 2013 Southern Oxidant and Aerosol Study (SOAS) ambient field campaign in the forested SE US. The ambient IMS–MS signals are consistent with laboratory IMS–MS spectra obtained from single-component carboxylic acids and multicomponent mixtures of isoprene and monoterpene oxidation products. Mass-mobility correlations in the 2-D IMS–MS space provide a means of identifying ions with similar molecular structures within complex mass spectra and are used to separate and identify monoterpene oxidation products in the ambient data that are produced from different chemical pathways. Water-soluble organic carbon (WSOC) constituents of fine aerosol particles that are not resolvable with standard analytical separation methods, such as liquid chromatography (LC), are shown to be separable with IMS–MS coupled to an electrospray ionization (ESI) source. The capability to use ion mobility to differentiate between isomers is demonstrated for organosulfates derived from the reactive uptake of isomers of isoprene epoxydiols (IEPOX) onto wet acidic sulfate aerosol. As a result, controlled fragmentation of precursor ions by collisionally induced dissociation (CID) in the transfer region between the IMS and the MS is used to validate MS peak assignments, elucidate structures of oligomers, and confirm the presence of the organosulfate functional group.

Research Organization:
Boston College, Chestnut Hill, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0011935; SC001110
OSTI ID:
1271467
Alternate ID(s):
OSTI ID: 1360128
Journal Information:
Atmospheric Measurement Techniques (Online), Vol. 9, Issue 7; ISSN 1867-8548
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 54 works
Citation information provided by
Web of Science

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Cited By (7)

An omnipresent diversity and variability in the chemical composition of atmospheric functionalized organic aerosol journal November 2018
Novel pathway of SO 2 oxidation in the atmosphere: reactions with monoterpene ozonolysis intermediates and secondary organic aerosol journal January 2018
Molecular characterization of alkyl nitrates in atmospheric aerosols by ion mobility mass spectrometry journal January 2019
Performance of a new coaxial ion–molecule reaction region for low-pressure chemical ionization mass spectrometry with reduced instrument wall interactions journal January 2019
Field intercomparison of the gas/particle partitioning of oxygenated organics during the Southern Oxidant and Aerosol Study (SOAS) in 2013 text January 2016
Field intercomparison of the gas/particle partitioning of oxygenated organics during the Southern Oxidant and Aerosol Study (SOAS) in 2013 text January 2016
Field intercomparison of the gas/particle partitioning of oxygenated organics during the Southern Oxidant and Aerosol Study (SOAS) in 2013 journal September 2016

Figures / Tables (12)