富氨地区秋冬季不同PM<sub>2.5</sub>污染级别气溶胶酸性及其影响因素

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Abstract This study was conducted to understand the aerosol acidity at different levels of air pollution and its influencing factors over ammonia-rich area in autumn and winter. Two non-urban sites in Zhengzhou, Xinmi and Airport, were selected for PM_2.5 sample collection from 15^th Oct 2018 to 28^th Feb 2019. Ion chromatography was used for water-soluble inorganic ions. The aerosol model ISORROPIA-Ⅱ for pH values of PM_2.5. The results show that NO₃^-, NH₄⁺ and SO₄^2- were the three most important ions. With the worsening of the pollution, NO₃^-, SO₄^2-, NH₄⁺ showed an upward trend and both NO₃^- and NH₄⁺ increased at a greater rate. The ratio of NH₄⁺/SO₄^2- higher than 0.75 implied that the atmosphere was in an ammonia-rich site. NH₄ ⁺ mainly existed in the form of (NH₄)₂SO₄, NH₄NO₃ and NH₄Cl in autumn and winter. The PM_2.5 pH was moderately acidic, 4.6±0.6 at Xinmi and 4.6±0.7 at Airport, respectively. With the aggravation of pollution, the variation in pH value became smaller. TNH₃, SO₄^2- and T were identified to be the main driving factors affecting the PM_2.5 pH in winter and autumn. With the aggravation of pollution, the greatest factor manipulating aerosol acidity changed from TNH₃ to SO₄^2-. With an increase in pH values, TNO₃ tended to become the particle phase, while TNH₃ tended to be the gas phase.

Key words： ammonia-rich site ISORROPIA-Ⅱ model sensitivity analysis heavy pollution gas-particle partition

Received: 22 May 2021

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X513

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	CHEN Ying
	XU Rui-xin
	HAO Qi
	JIANG Nan
	LIU Yang
	ZHANG Rui-qin
	CHEN Jing

Cite this article:

CHEN Ying,XU Rui-xin,HAO Qi等. Aerosol acidity and its influencing factors at different PM_2.5 pollution levels in ammonia-rich area in autumn and winter[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(1): 43-51.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I1/43

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