期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
卷 7, 期 7, 页码 460-468出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.estlett.0c00276
关键词
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资金
- National Institute of Environmental Health Sciences [P30ES010126]
- National Science Foundation (NSF) [AGS-1703535, AGS-1703019]
- National Institutes of Health (NIH) [T32ES007018]
- Hong Kong Research Grants Council (HKRGC) Project [2130626, 14300118]
Methyltetrol sulfates are unique tracers for secondary organic aerosols (SOA) formed from acid-driven multiphase chemistry of isoprene-derived epoxydiols. 2-Methyltetrol sulfate diastereomers (2-MTSs) are the dominant isomers and single most-abundant SOA tracers in atmospheric fine particulate matter (PM2.5), but their atmospheric sinks remain unknown. We investigated the oxidative aging of authentic 2-MTS aerosols by gas-phase hydroxyl radicals ((OH)-O-center dot) at a relative humidity of 61 +/- 1%. The effective rate constant for this heterogeneous reaction was determined as 4.9 +/- 0.6 x 10(-13) cm(3) molecules(-1) s(-1), corresponding to an atmospheric lifetime of 16 +/- 2 days (assuming an (OH)-O-center dot concentration of 1.5 x 10(6) molecules cm(-3)). Chemical changes to 2-MTSs were monitored by hydrophilic interaction liquid chromatography interfaced to electrospray ionization high-resolution quadrupole time-of-flight mass spectrometry (HILIC/ESI-HR-QTOFMS). Plausible reaction mechanisms are proposed for previously unknown OSs detected in atmospheric PM2.5 at mass-to-charge ratios (m/z) of 139 (C2H3O5S-), 155 (C2H3O6S-), 169 (C3H5O6S-), 171 (C3H7O6S-), 185 (C3H5O7S-), 199 (C4H7O7S-), 211 (C5H7O7S-), 213 (C5H9O7S-), 227 (C5H7O8S-), 229 (C5H9O8S-), and 231 (C5H11O8S-). Heterogeneous H-center dot oxidation of 2-MTSs redistributes the particulate sulfur speciation into more oxygenated/functionalized OSs, likely modifying the aerosol physicochemical properties of SOA containing 2-MTSs.
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