Isoprene Epoxydiol-Derived Sulfated and Nonsulfated Oligomers Suppress Particulate Mass Loss during Oxidative Aging of Secondary Organic Aerosol

N.Cazimir Armstrong; Yuzhi Chen; Tianqu Cui

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Isoprene Epoxydiol-Derived Sulfated and Nonsulfated Oligomers Suppress Particulate Mass Loss during Oxidative Aging of Secondary Organic Aerosol

机译：Isoprene Epoxydiol-Derived Sulfated and Nonsulfated Oligomers Suppress Particulate Mass Loss during Oxidative Aging of Secondary Organic Aerosol

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Acid-driven multiphase chemistry of isoprene epoxydiols(IEPOX)with inorganic sulfate aerosols contributes substantially to secondary organic aerosol@OA)formation,which constitutes a large mass fraction of atmospheric fine particulate matter(PM_(2.5)).However,the atmospheric chemical sinks of freshly generated IEPOX-SOA particles remain unclear.We examined the role of heterogeneous oxidation of freshly generated IEPOX-SOA particles by gas-phase hydroxyl radical(~·OH)under dark conditions as one potential atmospheric sink.After 4 h of gas-phase ~·OH exposure(~3 × 10~8 molecules cm~(-3)),chemical changes in smog chamber-generated IEPOX-SOA particles were assessed by hydrophilic interaction liquid chromatography coupled with electrospray ionization high-resolution quadrupole time-of-flight mass spectrometry(HILIC/ESI-HR-QTOFMS).A comparison of the molecular-level compositional changes in IEPOX-SOA particles during aging with or without"OH revealed that decomposition of oligomers by heterogeneous *OH oxidation acts as a sink for ~·OH and maintains a reservoir of low-volatility compounds,including monomeric sulfate esters and oligomer fragments.We propose tentative structures and formation mechanisms for previously uncharacterized SOA constituents in PM_(2.5).Our results suggest that this ~·OH-driven renewal of low-volatility products may extend the atmospheric lifetimes of particle-phase IEPOX-SOA by slowing the production of low-molecular weight,high-volatility organic fragments and likely contributes to the large quantities of 2-methyltetrols and methyltetrol sulfates reported in PM_(2.5).

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《Environmental Science & Technology: ES&T》 |2022年第23期|16611-16620|共10页
作者
N.Cazimir Armstrong; Yuzhi Chen; Tianqu Cui;
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作者单位

Department of Environmental Sciences and Engineering Gillings School of Global Public Health,The University of North Carolina at Chapel Hill,Chapel Hill,North Carolina 27599,United States;

Department of Environmental Sciences and Engineering Gillings School of Global Public Health,The University of North Carolina at Chapel Hill,Chapel Hill,North Carolina 27S99,United States;

Department of Environmental Sciences and Engineering,Gillings School of Global Public Health,The University of North Carolina at Chapel Hill,Chapel Hill,North Carolina 27599,United States;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
hydroxyl radical; fragmentation; revolatilization; atmospheric lifetime; methyltetrols; organosulfates; atmospheric multiphase chemistry;

Isoprene Epoxydiol-Derived Sulfated and Nonsulfated Oligomers Suppress Particulate Mass Loss during Oxidative Aging of Secondary Organic Aerosol

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