南京市一次霾污染过程中水溶性离子分布特征

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Abstract

The composition of PM_2.5 was monitored online continuously by using MARGA 1S Analyzer ADI 2080 in Nanjing from December 27, 2017 to January 5, 2018. Combined with meteorological elements and atmospheric environmental monitoring data, the time distribution and source characteristics of water-soluble ions in haze pollution process was investigated. The mass concentration of water-soluble ions in Nanjing during the haze pollution was 121.41μg/m³, 3.2 times of the level in clean days. The order of the average mass concentration of water-soluble ions in the haze pollution process was NO₃^- > SO₄^2- > NH₄⁺ > Cl^- > K⁺ > Ca²⁺ > Mg²⁺. SO₄^2-, NO₃^- and NH₄⁺ accounted for 91.97% of the total water-soluble ions concentration. The diurnal variations of water-soluble ions in haze days were all trimodal, while in clean days, Cl^-, SO₄^2- and NH₄^- were unimodal, Ca²⁺ was bimodal, K⁺ and Mg²⁺ were trimodal. With the aggravation of the air pollution, the proportion of total water-soluble ions in PM_2.5 was decreasing. When the air quality was excellent, the proportion was 95.93%, while it was 63.25% when serious pollution occurred. With the increase of pollution in haze days, the proportion of NH₄⁺ to total water-soluble ions was stable at around 23%, the proportion of SO₄^2- decreased slowly, and the proportion of NO₃^- increased continuously. The diurnal variations of NOR and SOR were bimodal in haze days, while in clear days, they were relatively stable. During the observation period, water-soluble ions were derived mainly from secondary conversion, coal ash, dust, and biomass combustion.

Key words： MARGA PM_2.5 water-soluble ions haze Nanjing

Received: 22 October 2018

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X513

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	Articles by authors
	LIU An-kang
	WANG Hong-lei
	CHEN Kui
	LU Wen
	SHI Shuang-shuang
	LIU Zhen

Cite this article:

LIU An-kang,WANG Hong-lei,CHEN Kui等. Distribution characteristics of water-soluble ions during a haze pollution process in Nanjing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(5): 1793-1803.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I5/1793

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