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Analysis of Organic Sulfur Compounds in Atmospheric Aerosols at the HKUST Supersite in Hong Kong Using HR-ToF-AMS

Authors Huang, Dan Dan HKUST affiliated (currently or previously)
Li, Yong Jie HKUST affiliated (currently or previously).
Lee, Berto P. HKUST affiliated (currently or previously)
Chan, Chak Keung View this author's profile
Issue Date 2015
Source Environmental Science and Technology , v. 49, (6), March 2015, p. 3672-3679
Summary Organic sulfur compounds have been identified in ambient secondary organic aerosols, but their contribution to organic mass is not well quantified. In this study, using a high-resolution time-of-flight aerosol. mass Spectrometer (ANIS), concentrations of organic sulfur compounds were estimated based on the high-resolution fragmentation patterns of methanesulfonic add (MSA), and organosulfates (OS); including alkyl, phenyl, and cycloalkyl sulfates, obtained in laboratory experiments. Mass concentrations of MSA and minimum mass concentrations of OS were determined in a field campaign conducted at a coastal site of Hong Kong in September 2011. MSA and OS together accounted for at least 5% of AMS detected organics. MSA is of marine origin with its formation dominated by local photochemical activities and enhanced by aqueous phase processing. OS concentrations are better correlated with parade liquid water content (LWC) than with particle acidity. High-molecular-weight OS were detected in the continental influenced poriod probably because they had grown into larger molecules during long-range transport Or they were formed from large anthropogenic precursors. This study highlights the importance of both aqueous-phase processing and regional influence, i.e., different air mass origins, on organic sulfur compound formation in coastal cities like Hong Kong.
ISSN 0013-936X
Language English
Format Article
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