10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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α-Hydroxy Organosulfates and Nitroxy Organosulfates Derived from Monoterpenes: Stability and Ambient Presence
Yuchen Wang, Rongbiao Tong, JIAN ZHEN YU, Hong Kong University of Science & Technology
Abstract Number: 1335 Working Group: Aerosol Chemistry
Abstract Organosulfates (OSs) derived from biogenic volatile organic compounds represent an important class of products formed between anthropogenic sulfur pollution and natural emissions. A lack of commercially available OS standards presents a significant obstacle to quantify this chemical interaction between human and nature. We synthesized α-hydroxy OS standards derived from eight monoterpenes (i.e., α- & β- pinene, limonene, sabinene, Δ3-carene, terpinolene, α-terpinene, and γ-terpinene) and two sesquiterpenes (i.e., α-humulene and β-caryophllene). After comparison of the MS/MS spectra and liquid chromatographic retention times between standards and ambient aerosol, we have positively identified α-hydroxy OSs derived from six monoterpenes (i.e., α- & β-pinene, limonene, sabinene, Δ3-carene, and terpinolene), and β-caryophllene in ambient samples from select locations in China, but failed to detect α-hydroxy OSs derived from α-terpinene, γ-terpinene, or α-humulene. With the exception of α-pinene, we did not detect OS regioisomers that have the sulfate group at the more substituted carbon position. This observation may have implication on OS formation mechanism, appearing to favor a diol intermediate pathway. Nitroxy organosulfates derived from limonene and β-pinene were also synthesized, providing opportunities to study their stability. Our work highlights the critical importance of having authentic standards in advancing our understanding of organosulfates.