Journal article
Real-time organic aerosol chemical speciation in the indoor environment using extractive electrospray ionization mass spectrometry
INDOOR AIR, v 31(1), pp 141-155
Jan 2021
PMID: 32696534
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Understanding the sources and composition of organic aerosol (OA) in indoor environments requires rapid measurements, since many emissions and processes have short timescales. However, real-time molecular-level OA measurements have not been reported indoors. Here, we present quantitative measurements, at a time resolution of five seconds, of molecular ions corresponding to diverse aerosol-phase species, by applying extractive electrospray ionization mass spectrometry (EESI-MS) to indoor air analysis for the first time, as part of the highly instrumented HOMEChem field study. We demonstrate how the complex spectra of EESI-MS are screened in order to extract chemical information and investigate the possibility of interference from gas-phase semivolatile species. During experiments that simulated the Thanksgiving US holiday meal preparation, EESI-MS quantified multiple species, including fatty acids, carbohydrates, siloxanes, and phthalates. Intercomparisons with Aerosol Mass Spectrometer (AMS) and Scanning Mobility Particle Sizer suggest that EESI-MS quantified a large fraction of OA. Comparisons with FIGAERO-CIMS shows similar signal levels and good correlation, with a range of 100 for the relative sensitivities. Comparisons with SV-TAG for phthalates and with SV-TAG and AMS for total siloxanes also show strong correlation. EESI-MS observations can be used with gas-phase measurements to identify co-emitted gas- and aerosol-phase species, and this is demonstrated using complementary gas-phase PTR-MS observations.
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Details
- Title
- Real-time organic aerosol chemical speciation in the indoor environment using extractive electrospray ionization mass spectrometry
- Publication Details
- INDOOR AIR, v 31(1), pp 141-155
- Publisher
- WILEY; HOBOKEN
- Number of pages
- 14
- Grant note
- We thank a Cooperative Institute for Research in Environmental Sciences (CIRES) Innovative Research Program (IRP) grant, a CIRES Graduate Student Fellowship, and the Alfred P. Sloan Foundation (grants 2016-7173, 2019-12444, G-2017-9944, 2019-12301, and 2018-11366) for supporting this work. We thank the entire HOMEChem science team and the University of Texas Austin for their gracious support. Finally, we thank Felipe Lopez-Hilfiker of Tofwerk and Eleanor Browne of CU-Boulder for instrumental support, as well as the EESI and CIMS users (in particular Jay Slowik, Chuan Ping Lee, Veronika Pospisilova, and John Liggio) for very useful discussions.
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Drexel University
- Web of Science ID
- WOS:000563868400001
- Scopus ID
- 2-s2.0-85089400869
- Other Identifier
- 991021860661304721
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- Collaboration types
- Industry collaboration
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Construction & Building Technology
- Engineering, Environmental
- Public, Environmental & Occupational Health