干旱区生态环境知识资源中心(Arid): Atmospheric Processes of Aromatic Hydrocarbons in the Presence of Mineral Dust Particles in an Urban Environment

Arid

DOI	10.1021/acsearthspacechem.9b00195
	Atmospheric Processes of Aromatic Hydrocarbons in the Presence of Mineral Dust Particles in an Urban Environment
	Yu, Zechen; Jang, Myoseon
通讯作者	Jang, Myoseon
来源期刊	ACS EARTH AND SPACE CHEMISTRY
ISSN	2472-3452
出版年	2019
卷号	3 期号:11 页码:2404-2414
英文摘要	The impact of Gobi Desert dust (GDD) particles on the secondary organic aerosol (SOA) formation was studied to understand the photooxidation of volatile organic compounds, namely, toluene, 1,3,5-trimethylbenzene, and gasoline vapor, in the presence of NOx using a large outdoor photochemical smog chamber under natural sunlight. SOA yields of all three precursors were found to significantly increase in the presence of GDD particles. The mechanistic role of mineral dust in SOA growth changed with the dust-phase water content. In the presence of dry dust, the formation of carboxylate salts increased SOA growth, but it was limited by the dust's buffering capacity associated with the quantity of alkaline carbonates that react with carboxylic acids. In the presence of wet GDD particles, the pathway via aqueous reactions of oxygenated organic products enhanced SOA growth. Nitric acid absorbed on wet GDD particles suppressed gas-dust partitioning of weakly acidic carboxylic acids. The formation of alkaline carboxylates was also supported by Fourier transform infrared spectroscopy of the SOA formed in the presence of dry GDD. The partitioned SOA products can be further oxidized by dust-phase OH radicals generated by photoactivation of semiconducting metal oxides (i.e., TiO2). This heterogeneous oxidation of SOA products was observed by studying the degradation of a surrogate compound, benzoate, in the presence of GDD under ambient sunlight. In typical urban atmospheres (high NOx levels) with relative humidity higher than 40%, authentic dust can be easily nitrated, elevating dust's hygroscopicity and significantly increasing SOA growth potential.
英文关键词	heterogeneous reaction secondary organic aerosol gasoline Gobi Desert dust hygroscopicity aromatic SOA
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000499739500005
WOS关键词	SECONDARY ORGANIC AEROSOL ; HETEROGENEOUS PHOTOOXIDATION ; SULFUR-DIOXIDE ; SOA FORMATION ; NITRIC-ACID ; ASIAN DUST ; HYGROSCOPIC PROPERTIES ; LABORATORY PROXIES ; CALCIUM-CARBONATE ; MASS-SPECTROMETRY
WOS类目	Chemistry, Multidisciplinary ; Geochemistry & Geophysics
WOS研究方向	Chemistry ; Geochemistry & Geophysics
EI主题词	2019-11-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310494
作者单位	Univ Florida, Dept Environm Engn Sci, Gainesville, FL 32611 USA
推荐引用方式 GB/T 7714	Yu, Zechen,Jang, Myoseon. Atmospheric Processes of Aromatic Hydrocarbons in the Presence of Mineral Dust Particles in an Urban Environment[J],2019,3(11):2404-2414.
APA	Yu, Zechen,&Jang, Myoseon.(2019).Atmospheric Processes of Aromatic Hydrocarbons in the Presence of Mineral Dust Particles in an Urban Environment.ACS EARTH AND SPACE CHEMISTRY,3(11),2404-2414.
MLA	Yu, Zechen,et al."Atmospheric Processes of Aromatic Hydrocarbons in the Presence of Mineral Dust Particles in an Urban Environment".ACS EARTH AND SPACE CHEMISTRY 3.11(2019):2404-2414.