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DOI	10.1016/j.atmosenv.2019.117197
	Semi-volatile components of PM2.5 in an urban environment: Volatility profiles and associated oxidative potential
	Pirhadi M.; Mousavi A.; Taghvaee S.; Shafer M.M.; Sioutas C.
发表日期	2020
ISSN	1352-2310
卷号	223
英文摘要	The volatility profiles of PM2.5 semi-volatile compounds and relationships to the oxidative potential of urban airborne particles were investigated in central Los Angeles, CA. Ambient and thermodenuded fine (PM2.5) particles were collected during both warm and cold seasons by employing the Versatile Aerosol Concentration Enrichment System (VACES) combined with a thermodenuder. When operated at 50 °C and 100 °C, the VACES/thermodenuder system removed about 50% and 75% of the PM2.5 vol concentration, respectively. Most of the quantified PM2.5 semi-volatile species including organic carbon (OC), water soluble organic carbon (WSOC), polycyclic aromatic hydrocarbons (PAHs), organic acids, n-alkanes, and levoglucosan, as well as inorganic ions (i.e., nitrate, sulfate, and ammonium) exhibited concentration losses in the ranges of 40–66% and 67–92%, respectively, as the thermodenuder temperature increased to 50 °C and 100 °C. Species in the PM2.5 such as elemental carbon (EC) and inorganic elements (including trace metals) were minimally impacted by the heating process – thus can be considered refractory. On average, nearly half of the PM2.5 oxidative potential (as measured by the dichlorodihydrofluorescein (DCFH) alveolar macrophage in vitro assay) was associated with the semi-volatile species removed by heating the aerosols to only 50 °C, highlighting the importance of this quite volatile compartment to the ambient PM2.5 toxicity. The fraction of PM2.5 oxidative potential lost upon heating the aerosols to 100 °C further increased to around 75–85%. Furthermore, we document statistically significant correlations between the PM2.5 oxidative potential and different semi-volatile organic compounds originating from primary and secondary sources, including OC (Rwarm, and Rcold) (0.86, and 0.74), WSOC (0.60, and 0.98), PAHs (0.88, and 0.76), organic acids (0.76, and 0.88), and n-alkanes (0.67, and 0.83) in warm and cold seasons, respectively, while a strong correlation between oxidative potential and levoglucosan, a tracer of biomass burning, was observed only during the cold season (Rcold = 0.81). © 2019 Elsevier Ltd
英文关键词	DCFH assay; Gas-particle partitioning; PM2.5 oxidative potential; Semi-volatile organic compounds (SVOCs); Thermodenuder; Volatility
语种	英语
scopus关键词	Aerosols; Organic acids; Organic carbon; Paraffins; Refractory metals; Sulfur compounds; Trace elements; Volatile organic compounds; Gas-particle partitioning; Oxidative potential; Semi-volatile organic compounds (SVOCs); Thermodenuder; Volatility; Polycyclic aromatic hydrocarbons; alkane; aluminum; ammonia; barium; calcium; carbon; chromium; copper; decanoic acid; dichlorodihydrofluorescein; fluoranthene; iron; lanthanum; lauric acid; levoglucosan; magnesium; manganese; nickel; organic carbon; palmitic acid; phenanthrene; potassium; pyrene; sodium; sulfate; titanium; vanadium; volatile agent; volatile organic compound; zinc; assay; biomass burning; concentration (composition); correlation; elemental carbon; oxidation; particulate matter; urban atmosphere; volatile organic compound; volatilization; cold; environmental temperature; heating; high temperature; in vitro study; lung alveolus macrophage; oxidation reduction potential; particulate matter; priority journal; seasonal variation; urban area; California; Los Angeles [California]; United States
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129637
作者单位	University of Southern California, Department of Civil and Environmental Engineering, Los Angeles, CA, United States; University of Wisconsin-Madison, Wisconsin State Laboratory of Hygiene, Madison, WI, United States
推荐引用方式 GB/T 7714	Pirhadi M.,Mousavi A.,Taghvaee S.,et al. Semi-volatile components of PM2.5 in an urban environment: Volatility profiles and associated oxidative potential[J],2020,223.
APA	Pirhadi M.,Mousavi A.,Taghvaee S.,Shafer M.M.,&Sioutas C..(2020).Semi-volatile components of PM2.5 in an urban environment: Volatility profiles and associated oxidative potential.Atmospheric Environment,223.
MLA	Pirhadi M.,et al."Semi-volatile components of PM2.5 in an urban environment: Volatility profiles and associated oxidative potential".Atmospheric Environment 223(2020).