Concentrations and chemical compositions of fine particles (PM2.5)   during haze and non-haze days in Beijing

doi:10.1016/j.atmosres.2016.02.003

CORC > 北京大学 > 环境科学与工程学院

	Concentrations and chemical compositions of fine particles (PM2.5) during haze and non-haze days in Beijing
	Zhang, Yang ; Huang, Wei ; Cai, Tianqi ; Fang, Dongqing ; Wang, Yuqin ; Song, Jian ; Hu, Min ; Zhang, Yuanxun
刊名	ATMOSPHERIC RESEARCH
	2016
关键词	PM2.5 Beijing Haze Aerosol chemical compositions HUMAN RESPIRATORY-TRACT SOURCE PROFILES INORGANIC-IONS SEA-SALT AEROSOL CHINA EPISODES VISIBILITY NITRATE WINTER
DOI	10.1016/j.atmosres.2016.02.003
英文摘要	To investigate the chemical properties of PM2.5 and put forward reasonable control measures, daily samples of PM2.5 were collected at an urban site in Beijing from August 4 to September 3 of 2012 using two 2-channel samplers. Chemical analysis was conducted for eight water soluble inorganic ions (WSII, including Na+, NH4+, K+, Mg2+, Ca2+, Cl-, and SO4-), organic carbon (OC) and elementary carbon (EC). PM2.5 concentrations ranged from 8.8 to 218.6 mu g m(-3), with an average concentration of 80.6 +/- 573 mu g m(-3).WSII, the most dominant PM2.5 constituents contributing 60 +/- 18% of its mass, ranged from 3.1 to 172.2 mu m m(-3). SO42-, NO3-, and NH4+ dominated WSII (90 +/- 28%) and their concentrations were 1.3-105.7 mu g m(-3), 0.5-52.7 mu g m(-3) and 0.3-33.5 mu g m(-3), respectively. The concentrations of OC and EC were 3.0-28.8 mu gC m(-3) and 0.8-7.4 mu gC m(-3) constituting 17.6% and 4.9% of PM2.5, respectively. Three serious pollution episodes (haze days) occurred during the campaign. PM2.5 and its chemical species showed substantial increases during haze episodes. The greater enhancement factors for SO42- (4.5), NO3- (4.0), and NH4+ (4.2) during haze days compared to non-haze days were obtained, suggesting that these secondary inorganic ions play important roles in the formation of haze. The average ratio of NO3-/SO42- was 0.52. Ion balance calculations showed that PM2.5 samples were acidic during haze periods and close to neutral during non-haze days. Correlation analysis between the major ions was conducted and the results suggested that the main forms of NH4+ might be (NH4)(2)SO4. In addition, the variations between haze days and non-haze days for OC, EC, and the ratio of OC/EC were discussed. (C) 2016 Elsevier B.V. All rights reserved.; CAS [Y12901FEA2, Y225019EA2]; Natural Science Foundation for the Youth [Y41101E1A1]; State Key Joint Laboratory of Environment Simulation and Pollution Control [15K05ESPCP]; SCI(E); EI; ARTICLE; zhangyang@ucas.ac.cn; yxzhang@ucas.ac.cn; 62-69; 174
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/437129]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Zhang, Yang,Huang, Wei,Cai, Tianqi,et al. Concentrations and chemical compositions of fine particles (PM2.5) during haze and non-haze days in Beijing[J]. ATMOSPHERIC RESEARCH,2016.
APA	Zhang, Yang.,Huang, Wei.,Cai, Tianqi.,Fang, Dongqing.,Wang, Yuqin.,...&Zhang, Yuanxun.(2016).Concentrations and chemical compositions of fine particles (PM2.5) during haze and non-haze days in Beijing.ATMOSPHERIC RESEARCH.
MLA	Zhang, Yang,et al."Concentrations and chemical compositions of fine particles (PM2.5) during haze and non-haze days in Beijing".ATMOSPHERIC RESEARCH (2016).