气候变化领域集成服务门户(CCPortal): The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments

CCPortal

DOI	10.1016/j.atmosres.2020.105039
	The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments
	Gali N.K.; Stevanovic S.; Brimblecombe P.; Brown R.A.; Ristovski Z.; Ning Z.
发表日期	2020
ISSN	0169-8095
卷号	244
英文摘要	The airborne particulate matter (PM) is known to cause adverse pulmonary and cardiovascular health effects. This study investigated the diurnal characteristics of PM induced PM-bound ROS from real time measurements in typical roadside and urban background sites in Hong Kong, and identified potential influencing factors to its variation in atmosphere. A nitroxide probe (BPEAnit) was employed in the real-time measurement of separate PM and gas phase induced reactive oxygen species (ROS) with a Particle-into-Liquid-Sampler. Measurements were carried in 2 h intervals over a 24 h period, and repeated for 6 days at each site. The total ROS (particle + gas phase) measurements resulted in multiple peaks at 08:00, 16:00 and 20:00 h time periods at background site, compared to non-intermittent decrease/increase trends at roadside. The total ROS generation was noted significantly higher by 50–100% (n = 6 p < .05) at roadside compared to the background site. While the contribution of PM2.5- and gas phase-induced ROS to the total ROS was on average 48 ± 8% and 52 ± 8% across 24 h at background site, the ratio of gas phase-induced ROS increased to 79 ± 4% and that of particle phase decreased to 21 ± 4% at roadside site. The total ROS well correlated with black carbon (BC) and particle-bound PAHs (p-PAHs), which are 4–8 fold and 10–20 fold higher at roadside than background. The ratio of p-PAHs/BC was high at roadside during peak hours compared to late nights suggesting fresh PM may have induced more total ROS generation compared to aged aerosols using this specific ROS probe. © 2020 Elsevier B.V.
英文关键词	Diurnal analysis; Oxidative potential; Particle-into-liquid-sampler; Particulate matter; Roadside
语种	英语
scopus关键词	Gases; Particulate emissions; Probes; Roadsides; Time measurement; Airborne particulate matters; Health effects; Multiple-peak; Particle phase; Real time measurements; Roadside environments; Ros generations; Urban background; Urban growth; black carbon; diurnal variation; measurement method; particulate matter; reactive oxygen species; real time; roadside environment; urban atmosphere; China; Hong Kong
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141866
作者单位	Division of Environment & Sustainability, Hong Kong University of Science & Technology, Hong Kong; School Engineering, Faculty of Science & Built Environment, Deakin UniversityVictoria, Australia; School of Energy and Environment, City University of Hong Kong, Hong Kong; International Laboratory of Air Quality and Health, Queensland University of TechnologyQueensland 4001, Australia
推荐引用方式 GB/T 7714	Gali N.K.,Stevanovic S.,Brimblecombe P.,et al. The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments[J],2020,244.
APA	Gali N.K.,Stevanovic S.,Brimblecombe P.,Brown R.A.,Ristovski Z.,&Ning Z..(2020).The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments.Atmospheric Research,244.
MLA	Gali N.K.,et al."The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments".Atmospheric Research 244(2020).