华中背景地区大气颗粒物中水溶性离子特征与来源解析

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Abstract To investigate the characteristics, formation mechanisms, and sources of water-soluble inorganic ions (WSIIs) in PM_2.5 in the central China background area, the study conducted a one-year sampling observation at the Jinsha atmospheric background station. The results showed that the average annual mass concentration of PM_2.5 was (31.40±2.05) μg/m³, showing remarkable seasonal variations of the highest level in winter and lowest in summer. Secondary inorganic aerosol (SNA, i.e., SO₄^2-, NO₃^-, and NH₄⁺) was an important component of PM_2.5. The proportions of SNA in WSIIs in spring, summer, autumn, and winter were 84.0%, 77.6%, 79.8%, and 84.5%, respectively, indicating secondary formation was pronounced. The average molar equivalent ratio of anions and cations (AE/CE) during the study period was 0.91, and PM_2.5 showed weak alkalinity. (NH₄)₂SO₄, NH₄NO₃, and NH₄Cl were the main forms of ion species in summer, while (NH₄)₂SO₄ may be the main form in spring, autumn, and winter. The sulfur oxidation rate (SOR) and nitrogen oxidation rate (NOR) were 0.48 and 0.14, respectively, showing a significant positive correlation with PM_2.5, indicating that secondary conversion was an important reason for the increase in PM_2.5 concentration. The potential sources and transmission paths of WSIIs had obvious seasonal characteristics. The secondary transformation of pollutants during the migration process from the source area to the background area was obvious, and the concentration of pollutants carried by long-distance air masses from the northwest or due north was relatively high.

Key words： background region PM_2.5 water-soluble inorganic ions source apportionment

Received: 07 November 2023

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X513

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	DENG Meng-jie
	LEI Yu-guo
	CHENG Hai-rong

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DENG Meng-jie,LEI Yu-guo,CHENG Hai-rong. Characteristics and source apportionment of water-soluble inorganic ions in PM_2.5 in central China background region[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(7): 3573-3580.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I7/3573

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