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Field observation on secondary organic aerosols during Asian dust storm periods: Formation mechanism of oxalic acid and related compounds on dust surface
Wang, Gehui1,2,3; Cheng, Chunlei1,2,4; Meng, Jingjing1,2; Huang, Yao1,2,4; Li, Jianjun1,2; Ren, Yanqin1,2,4
2015-07-01
Source PublicationATMOSPHERIC ENVIRONMENT
ISSN1352-2310
Volume113Pages:169-176
SubtypeArticle
Abstract

Chemical evolution of East Asian dust during transpacific transport has been given much attention for inorganic species such as sulfate, nitrate and ammonium. However, the role of organic species during the transport has almost entirely been ignored. To understand the formation mechanism of secondary organic aerosols (SOA) on dust surfaces, this study investigated the concentrations and compositions of dicarboxylic acids, keto-carboxylic acids, alpha-dicarbonyls and inorganic ions in size-segregated aerosols (9-stages) collected in Xi'an, central China during the two dust storm episodes in the springs of 2009 and 2011 and compared with those in nondust storm periods. During the events the ambient particulate dicarboxylic acids were 932-2240 ng m(-3), which are comparable and even higher than those in nondust periods. Molecular compositions of the above SOA are similar to those in nondust periods with oxalic acid being the leading species. In the presence of the dust storms, all the above mentioned SOA species in Xi'an were predominantly enriched on the coarse particles (>2.1 mu m), and oxalic acid well correlated with NO3- (R-2 = 0.72, p < 0.001) rather than SO42-. This phenomenon differs greatly from the SOA in any other nondust period that is usually characterized by an enrichment of oxalic acid in fine mode and a strong correlation of oxalic acid with SO42-. We propose a formation pathway to explain these observations, in which nitric acid and/or nitrogen oxides react with dust to produce Ca(NO3)(2) and form a liquid phase on the surface of dust aerosols via water vapor-absorption of Ca(NO3)(2), followed by a partitioning of the gas-phase water-soluble organic precursors (e.g.,glyoxal and methylglyoxal) into the aqueous-phase and a subsequent oxidation into oxalic acid. To the best of our knowledge, we found for the first time the enrichment of glyoxal and methylglyoxal on dust surface. Our data suggest an important role of nitrate in the heterogeneous formation process of SOA on the surface of dust. (C) 2015 Elsevier Ltd. All rights reserved.

KeywordDicarboxylic Acid Carbonyls Nitrate Sulfate Size Distribution Aqueous-phase Oxidation
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
DOI10.1016/j.atmosenv.2015.05.013
WOS KeywordLong-range Transport ; Gaseous Nitric-acid ; Dicarboxylic-acids ; Mineral Dust ; Inland China ; Intex-b ; Heterogeneous Reactivity ; Atmospheric Particles ; Isotopic Compositions ; Ketocarboxylic Acids
Indexed BySCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS SubjectEnvironmental Sciences ; Meteorology & Atmospheric Sciences
WOS IDWOS:000356547400019
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9300
Collection粉尘与环境研究室
Corresponding AuthorWang, Gehui
Affiliation1.Chinese Acad Sci, Key Lab Aerosol Chem & Phys, Inst Earth Environm, Xian 710061, Peoples R China
2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
3.Xi An Jiao Tong Univ, Sch Human Settlement & Civil Engn, Xian 710049, Peoples R China
4.Univ Chinese Acad Sci, Beijing 10049, Peoples R China
Recommended Citation
GB/T 7714
Wang, Gehui,Cheng, Chunlei,Meng, Jingjing,et al. Field observation on secondary organic aerosols during Asian dust storm periods: Formation mechanism of oxalic acid and related compounds on dust surface[J]. ATMOSPHERIC ENVIRONMENT,2015,113:169-176.
APA Wang, Gehui,Cheng, Chunlei,Meng, Jingjing,Huang, Yao,Li, Jianjun,&Ren, Yanqin.(2015).Field observation on secondary organic aerosols during Asian dust storm periods: Formation mechanism of oxalic acid and related compounds on dust surface.ATMOSPHERIC ENVIRONMENT,113,169-176.
MLA Wang, Gehui,et al."Field observation on secondary organic aerosols during Asian dust storm periods: Formation mechanism of oxalic acid and related compounds on dust surface".ATMOSPHERIC ENVIRONMENT 113(2015):169-176.
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