深圳冬季大气气态硝酸和硝酸盐气粒分配特征

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Abstract In this study, the dual-channel online gas and aerosol analyzer (MARGA) was used to simultaneously observe water-soluble inorganic ions and their gaseous precursors in PM_2.5 and PM₁₀ in Shenzhen in winter, in order to explore the gas-particle partitioning characteristic of gaseous nitric acid (HNO₃) and particle nitrate (pNO₃^-). It was shown that gaseous nitric acid, fine-particle nitrate and coarse-particle nitrate accounted for 9.6%, 56.8% and 33.6% of total nitrate (TNO₃,=HNO₃+ pNO₃^-), respectively. The diurnal variation of TNO₃ concentration presented a curve of two peaks. The peak in the morning was related to the increase of fine NO₃^- caused by NO_x from vehicles in the morning rush hour. The photochemical reaction in the daytime increased the concentration of three components of TNO₃, so the TNO₃ concentration reached the highest level of the day at 17:00. The analysis suggested that low temperature was beneficial for NO₃^- to exist in fine particles as NH₄NO₃. When the concentration of TNO₃ was high, the proportion of NO₃^- in fine particles also increased.

Key words： nitrate nitric acid water-soluble inorganic ions coarse particles gas-particle partitioning

Received: 01 March 2021

PACS:

X513

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	Articles by authors
	CHEN Yao
	YUN Long
	LUO Yao
	NIU Ying-bo
	PENG Xing
	HE Ling-yan
	HUANG Xiao-feng

Cite this article:

CHEN Yao,YUN Long,LUO Yao等. Characteristics of gas-particle partitioning of gaseous nitric acid and particle nitrate in Shenzhen in winter[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4036-4042.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I9/4036

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