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• W4225536277 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Organosulfur compounds (OrgSs), especially organosulfates, have been widely reported to be present in large quantities in particulate organic matter found in various atmospheric environments. Despite hundreds of organosulfates and their formation mechanisms being previously identified, a large fraction of OrgSs remain unexplained at the molecular level, and a better understanding of their formation pathways and critical environmental parameters is required to explain the variations in their concentrations. In this study, the abundance and molecular composition of OrgSs in fine particulate samples collected in Guangzhou were reported. The results revealed that the ratio of the annual average mass of organic sulfur to total particulate sulfur was 33 <span class=inline-formula>±</span> 12 %, and organic sulfur had positive correlations with SO<span class=inline-formula>₂</span> (<span class=inline-formula><i>r</i>=0.37</span>, <span class=inline-formula><i>p</i><0.05</span>) and oxidant (NO<span class=inline-formula>_<i>x</i></span> <span class=inline-formula>+</span> O<span class=inline-formula>₃</span>, <span class=inline-formula><i>r</i>=0.40</span>, <span class=inline-formula><i>p</i><0.01</span>). A Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) analysis revealed that more than 80 % of the sulfur-containing formulas detected in the samples had the elemental composition of <span class=inline-formula><math xmlns=http://www.w3.org/1998/Math/MathML id=M10 display=inline overflow=scroll dspmath=mathml><mrow><mi>o</mi><mo>/</mo><mo>(</mo><mn mathvariant=normal>4</mn><mi>s</mi><mo>+</mo><mn mathvariant=normal>3</mn><mi>n</mi><mo>)</mo><mo>≥</mo><mn mathvariant=normal>1</mn></mrow></math><span><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=76pt height=14pt class=svg-formula dspmath=mathimg md5hash=fd8576a8825a2434c3615df80b38ac54><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=acp-22-6919-2022-ie00001.svg width=76pt height=14pt src=acp-22-6919-2022-ie00001.png/></svg:svg></span></span>, indicating that they were largely in the form of oxidized organosulfates or nitrooxy organosulfates. Many OrgSs that were previously tentatively identified as having biogenic or anthropogenic origins were also present in freshly emitted aerosols derived from combustion sources. The results indicated that the formation of OrgSs through an epoxide intermediate pathway could account for up to 46 % of OrgSs from an upper bound estimation, and the oxidant levels could explain 20 % of the variation in the mass of organic sulfur. The analysis of our large dataset of FT-ICR MS results suggested that relative humidity, oxidation of biogenic volatile organic compounds via ozonolysis, and NO<span class=inline-formula>_<i>x</i></span>-related nitrooxy organosulfate formation were the major reasons for the molecular variation of OrgSs, possibly highlighting the importance of the acid-catalyzed ring-opening of epoxides, oxidation processes, and heterogeneous reactions involving either the uptake of SO<span class=inline-formula>₂</span> or the heterogeneous oxidation of particulate organosulfates into additional unrecognized OrgSs." @default.
• W4225536277 created "2022-05-05" @default.
• W4225536277 creator A5021630110 @default.
• W4225536277 date "2022-04-01" @default.
• W4225536277 modified "2023-09-30" @default.
• W4225536277 title "Response to the Comments on acp-2021-1069" @default.
• W4225536277 doi "https://doi.org/10.5194/acp-2021-1069-ac1" @default.
• W4225536277 hasPublicationYear "2022" @default.
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