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Organosulfate Formation in Aerosol

出版	University of Florida, 2014
URL	http://books.google.com.hk/books?id=uve2swEACAAJ&hl=&source=gbs_api

註釋Organosulfate, a sulfuric acid ester formed through the reaction of sulfuric acid with an reactive organic compound, has recently been identified as an aerosol component in both laboratory and filed studies. However, the quantification of organosulfate is limited due to the lack of analytical methods. Using a semi-quantitative analysis, organosulfate was estimated to account for 2.3% of organic carbon, and 3.8% of total sulfate in ambient aerosol. The ultimate purpose of this study is to quantify dialkylsulfate formation in the internally mixed organic-H2SO4 aerosols, sulfuric acid seeded secondary organic aerosols (SOAs), and ambient aerosols. The purpose has been achieved as followed: 1) developing the C-RUV to determine the [H+] for aerosols comprising NH4+, H+, SO42-, and H2O under various relative humidities; 2) study the kinetics of organosulfate formation in the aerosol using the C-RUV technique and Fourier Transform Infrared (FTIR) spectrometer; 3) quantifying the dialkylsulfate formation in the sulfuric acid seeded SOA produced via the photooxidation of various volatile organic compounds (VOCs); 4) measuring the concentrations of dialkylsulfates in the ambient aerosol. The study has been done using both an indoor Teflon film chamber and the University of Florida Atmospheric PHotochemical Outdoor Reactor (UF-APHOR) chamber. The ambient aerosol was collected from the sampling site located on campus of the University of Florida at Gainesville, Florida. Results show.