气候变化领域集成服务门户(CCPortal): Influence of environmental conditions on the dithiothreitol (DTT)-Based oxidative potential of size-resolved indoor particulate matter of ambient origin

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DOI	10.1016/j.atmosenv.2021.118429
	Influence of environmental conditions on the dithiothreitol (DTT)-Based oxidative potential of size-resolved indoor particulate matter of ambient origin
	Zeng Y.; Yu H.; Zhao H.; Stephens B.; Verma V.
发表日期	2021
ISSN	1352-2310
卷号	255
英文摘要	Much of human exposure to particulate matter (PM) of ambient origin occurs indoors. While the oxidative potential (OP) of PM is an emerging indicator of the intrinsic toxicity of PM, little is known about the OP of indoor PM of ambient origin. Here we characterize the OP of indoor and outdoor size-resolved PM in an unoccupied apartment unit in Chicago, IL, free from indoor emission sources, to explore how the transport of ambient PM from outdoors affects OP indoors. Simultaneous measurements were conducted in both indoor and outdoor locations for at least 5 consecutive days during 11 separate sampling campaigns spanning all seasons. OP was assessed by the dithiothreitol (DTT) assay. Indoor PM2.5 concentrations were consistently lower than outdoor PM2.5 concentrations, with an average (±standard deviation, SD) indoor/outdoor (I/O) PM2.5 mass concentration ratio of 0.36 ± 0.10. The volume-normalized (or extrinsic) OP of the particles was much higher for the outdoor for PM2.5 samples across all size-ranges, with an average (±SD) indoor-to-outdoor ratio (I/O) of 0.54 ± 0.57. However, the mass-normalized (or intrinsic) OP of indoor PM2.5 samples was greater than concurrent outdoor PM2.5 samples during 7 of the sampling periods and had an overall average ± SD I/O of 1.38 ± 0.97. The extent of enhancement in intrinsic OP of ambient-infiltrated indoor PM2.5 was positively correlated with differences in indoor and outdoor temperature and relative humidity (RH). We hypothesize that changes in the intrinsic OP of ambient PM as it infiltrates indoors may be influenced by transformation processes such as size-resolved penetration, indoor deposition, evaporation of volatile chemical components with lower OP, and/or temperature/RH-dependent partitioning of redox-active substances to indoor-infiltrated PM. However, further investigations, including chemical analyses of the size-segregated indoor and outdoor PM samples and the effect of environmental factors on this chemical composition, will be needed to confirm these hypotheses. © 2021 Elsevier Ltd
关键词	Indoor air quality Outdoor air quality Oxidative potential PM2.5 Pollutant transformation Toxicity
语种	英语
scopus关键词	Chemical analysis; Indoor air pollution; Particle size analysis; Redox reactions; Toxicity; Ambients; Dithiothreitol; Indoor air quality; Indoor/outdoor; Outdoor air qualities; Oxidative potential; Particulate Matter; Pm2.5; Pollutant transformation; Standard deviation; Air quality; dithiothreitol; ambient air; environmental conditions; indoor air; oxidative stress; particulate matter; pollution exposure; air quality; ambient air; Article; atmospheric deposition; chemical composition; concentration (parameter); controlled study; environmental factor; environmental temperature; evaporation; humidity; Illinois; indoor environment; oxidation; particle size; particulate matter 2.5; PM2.5 exposure; priority journal; seasonal variation; Chicago; Illinois; United States; Indicator indicator
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/248417
作者单位	Department of Civil, Architectural, and Environmental Engineering, Illinois Institute of Technology, Chicago, IL, United States; Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, United States; Residential Building Systems Group and Indoor Environment Group, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Zeng Y.,Yu H.,Zhao H.,et al. Influence of environmental conditions on the dithiothreitol (DTT)-Based oxidative potential of size-resolved indoor particulate matter of ambient origin[J],2021,255.
APA	Zeng Y.,Yu H.,Zhao H.,Stephens B.,&Verma V..(2021).Influence of environmental conditions on the dithiothreitol (DTT)-Based oxidative potential of size-resolved indoor particulate matter of ambient origin.ATMOSPHERIC ENVIRONMENT,255.
MLA	Zeng Y.,et al."Influence of environmental conditions on the dithiothreitol (DTT)-Based oxidative potential of size-resolved indoor particulate matter of ambient origin".ATMOSPHERIC ENVIRONMENT 255(2021).