Granulometric and magnetic properties of deposited particles in the   Beijing subway and the implications for air quality management

doi:10.1016/j.scitotenv.2016.06.154

CORC > 北京大学 > 城市与环境学院

	Granulometric and magnetic properties of deposited particles in the Beijing subway and the implications for air quality management
	Cui, Guipeng ; Zhou, Liping ; Dearing, John
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2016
关键词	Beijing subway Health Environmental magnetism Grain size Particulate matter (PM) RAILWAY TRANSIT SYSTEM HEAVY-METAL POLLUTION PARTICULATE MATTER STREET DUST ELEMENTAL COMPOSITION CHEMICAL-COMPOSITIONS AIRBORNE PARTICLES OXIDATIVE STRESS ORGANIC-MATTER AMBIENT AIR
DOI	10.1016/j.scitotenv.2016.06.154
英文摘要	The subway system is an important traffic facility in Beijing and its internal air quality is an environmental issue that could potentially affect millions of people every day. Due to the intrinsic nature of rail abrasion in subway tunnels, iron-containing particles can be generated and become suspended in the subway environment. While some studies (e.g. Li et al., 2006) have monitored the in-train levels of PM2.5 (particles < 2.5 mu m), there is a lack of systematic assessment of the concentration and characteristics of iron-containing particles in the Beijing subway system. Here we report results of a study on the granulometric and magnetic properties of deposited particle samples collected at different localities of the Beijing subway system. Our results show that the subway samples are characterized by the presence of fine particles. Volume proportions of 6.1 +/- 1.3% for particles < 2.5 mu m and 27.5 +/- 6.1% for particles < 10 mu m are found in the bulk subway samples. These samples exhibit a strong magnetic signal, which is approximately two orders of magnitude higher than that in naturally deposited particles collected in Beijing. Fine grained ferromagnetic and ferrimagnetic minerals (e.g. iron and magnetite, respectively) are identified from mineral magnetic measurements and scanning electric microscopy. The samples collected from the Beijing stations with platform screen doors are found to be magnetically stronger and finer than those without them, suggesting that platform screen doors have failed to block the fine iron-containing particles released from the rail tunnel. Given the potential health consequences of fine suspended iron-containing particles, our results have important implications for air quality management in the Beijing subway system. (C) 2016 Elsevier B.V. All rights reserved.; 111 Project [B14001]; SCI(E); EI; PubMed; ARTICLE; cuigp@pku.edu.cn; 1059-1068; 568
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/447874]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Cui, Guipeng,Zhou, Liping,Dearing, John. Granulometric and magnetic properties of deposited particles in the Beijing subway and the implications for air quality management[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2016.
APA	Cui, Guipeng,Zhou, Liping,&Dearing, John.(2016).Granulometric and magnetic properties of deposited particles in the Beijing subway and the implications for air quality management.SCIENCE OF THE TOTAL ENVIRONMENT.
MLA	Cui, Guipeng,et al."Granulometric and magnetic properties of deposited particles in the Beijing subway and the implications for air quality management".SCIENCE OF THE TOTAL ENVIRONMENT (2016).