Time-resolved molecular characterization of organic aerosols by PILS + UPLC/ESI-Q-TOFMS

X. Zhang, N. F. Dalleska, D. D. Huang, K. H. Bates, Armin Sorooshian, R. C. Flagan, J. H. Seinfeld

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Real-time and quantitative measurement of particulate matter chemical composition represents one of the most challenging problems in the field of atmospheric chemistry. In the present study, we integrate the Particle-into-Liquid Sampler (PILS) with Ultra Performance Liquid Chromatography/Electrospray ionization Quadrupole Time-of-Flight High-Resolution/Mass Spectrometry (UPLC/ESI-Q-TOFMS) for the time-resolved molecular speciation of chamber-derived secondary organic aerosol (SOA). The unique aspect of the combination of these two well-proven techniques is to provide quantifiable molecular-level information of particle-phase organic compounds on timescales of minutes. We demonstrate that the application of the PILS + UPLC/ESI-Q-TOFMS method is not limited to water-soluble inorganic ions and organic carbon, but is extended to slightly water-soluble species through collection efficiency calibration together with sensitivity and linearity tests. By correlating the water solubility of individual species with their O:C ratio, a parameter that is available for aerosol ensembles as well, we define an average aerosol O:C ratio threshold of 0.3, above which the PILS overall particulate mass collection efficiency approaches ~0.7. The PILS + UPLC/ESI-Q-TOFMS method can be potentially applied to probe the formation and evolution mechanism of a variety of biogenic and anthropogenic SOA systems in laboratory chamber experiments. We illustrate the application of this method to the reactive uptake of isoprene epoxydiols (IEPOX) on hydrated and acidic ammonium sulfate aerosols.

Original languageEnglish (US)
Pages (from-to)180-189
Number of pages10
JournalAtmospheric Environment
Volume130
DOIs
StatePublished - Apr 1 2016

Fingerprint

sampler
aerosol
liquid
isoprene
atmospheric chemistry
ammonium sulfate
linearity
water
liquid chromatography
particulate matter
organic compound
solubility
ionization
mass spectrometry
chemical composition
organic carbon
probe
particle
calibration
timescale

Keywords

  • Electrospray ionization (ESI)
  • Isoprene epoxydiols (IEPOX)
  • Particle-into-liquid samplers (PILS)
  • Quadrupole time-of-flight high-resolution mass spectrometry (q-tOFMS)
  • Secondary organic aerosol (SOA)
  • Ultra performance liquid chromatography (UPLC)

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science(all)

Cite this

Zhang, X., Dalleska, N. F., Huang, D. D., Bates, K. H., Sorooshian, A., Flagan, R. C., & Seinfeld, J. H. (2016). Time-resolved molecular characterization of organic aerosols by PILS + UPLC/ESI-Q-TOFMS. Atmospheric Environment, 130, 180-189. https://doi.org/10.1016/j.atmosenv.2015.08.049

Time-resolved molecular characterization of organic aerosols by PILS + UPLC/ESI-Q-TOFMS. / Zhang, X.; Dalleska, N. F.; Huang, D. D.; Bates, K. H.; Sorooshian, Armin; Flagan, R. C.; Seinfeld, J. H.

In: Atmospheric Environment, Vol. 130, 01.04.2016, p. 180-189.

Research output: Contribution to journalArticle

Zhang, X. ; Dalleska, N. F. ; Huang, D. D. ; Bates, K. H. ; Sorooshian, Armin ; Flagan, R. C. ; Seinfeld, J. H. / Time-resolved molecular characterization of organic aerosols by PILS + UPLC/ESI-Q-TOFMS. In: Atmospheric Environment. 2016 ; Vol. 130. pp. 180-189.
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