DEVELOPMENT OF A HYDROPHILIC LIQUID INTERACTION CHROMATOGRAPHY (HILIC) METHOD FOR THE CHEMICAL CHARACTERIZATION OF WATER-SOLUBLE ISOPRENE EPOXYDIOL (IEPOX)-DERIVED SEONDARY ORGANIC AEROSOL Public Deposited

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  • March 21, 2019
Creator
  • Zeng, Zhexi
    • Affiliation: Gillings School of Global Public Health, Department of Environmental Sciences and Engineering
Abstract
  • Atmospheric fine particulate matters (PM2.5) adversely affects air quality and human health. Isoprene is the most abundant non-methane volatile organic compound primarily emitted from biogenic sources to Earth’s atmosphere. Atmospheric oxidation of isoprene yields large quantities of gaseous isoprene epoxydiol (IEPOX) by hydroxyl radicals under low-nitric oxide conditions. IEPOX subsequently undergoes acid-catalyzed multiphase chemistry with natural or anthropogenic sulfate aerosol, producing substantial amounts of water-soluble IEPOX-derived secondary organic aerosol (SOA) in PM2.5. The hydrophilic interaction liquid chromatography interfaced to electrospray ionization-high-resolution quadrupole time-of-flight mass spectrometry (HILIC/ESI-HR-QTOFMS) method presented here overcomes limitations of commonly utilized analytical techniques, making it possible to identify and quantify water-soluble SOA constituents by a single analytical method. Atmospheric chemistry model predictions of the water-soluble IEPOX-derived SOA constituents (e.g., 2-methyltetrols and methyltetrol sulfates) in PM2.5 can now be assessed with greater accuracy and confidence.
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  • In Copyright
Advisor
  • Gold, Avram
  • Turpin, Barbara
  • Surratt, Jason
Degree
  • Master of Science
Degree granting institution
  • University of North Carolina at Chapel Hill Graduate School
Graduation year
  • 2018
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