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
- Last Modified
- 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.
- Date of publication
- August 2018
- Keyword
- DOI
- Resource type
- Rights statement
- In Copyright
- Advisor
- Turpin, Barbara
- Surratt, Jason
- Gold, Avram
- Degree
- Master of Science
- Degree granting institution
- University of North Carolina at Chapel Hill Graduate School
- Graduation year
- 2018
- Language
- Parents:
This work has no parents.
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