南京市大气细颗粒物二次组分的时空变化特征

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Abstract

Secondary components are important composition of PM_2.5, mainly including SO₄^2-, NO₃^-, NH₄⁺ and SOA. 513 PM_2.5 samples were collected at six sampling sites in Nanjing during four seasons from October 2014 to August 2015. Based on the chemical compositions, temporal and spatial characteristics of secondary components of PM_2.5 in Nanjing were analyzed. On averagely, the secondary components accounted for about 57.7% of the PM_2.5 mass concentration. Concentrations of SO₄^2-, NO₃^-, NH₄⁺ and SOA were 11.9, 12.5, 7.7 and 8.7μg/m³, with proportions of 17.2%, 16.9%, 10.5% and 13.1%, respectively, and 98.8% of SO₄^2- was non-sea-salt-originated. The value of[NO₃^-]/[SO₄^2-] had been increasing rapidly in recent yearsand reached about 1.0 in 2015, suggesting that vehicle pollution hasbeen aggravated in Nanjing. The contents of NO₃^-, NH₄⁺ and SOA in Nanjing werehigh in autumnand winter, lower in spring and summer, but SO₄^2- shows the opposite trend. Proportion of secondary componentswasthe highest (73.5%) in the outer suburb of the city, followed by suburb regions (59.0%), and lowest in city center and industrial region (57.3%, 57.4%), reflecting different sources in different regions.Proportions of NO₃^- kept steadily increasing with PM_2.5 concentrations rise, suggestingvehicle pollution may play a more important role in heavy haze pollution episodes. This study contributes to deepen understanding of the sources of PM_2.5 in Nanjing, and provides a scientific basis for the haze pollution control.

Key words： PM_2.5 secondary aerosols haze temporal and spatial characteristics Nanjing

Received: 23 January 2017

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X513

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	Articles by authors
	WEI Fei-fei
	LIU Hao
	LU Xiao-bo
	WANG Qin-geng
	GE Ying
	HAO Jiao

Cite this article:

WEI Fei-fei,LIU Hao,LU Xiao-bo等. Temporal and spatial characteristics of secondary components of PM_2.5 in Nanjing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(8): 2866-2876.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I8/2866

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