邢台市秋季PM<sub>2.5</sub>及水溶性离子污染特征

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Abstract

PM_2.5 samples were collected during autumnin Xingtai City from October 15th to November 14th, 2017, and the water- soluble ions Cl^-, NO₃^-, SO₄^2-, NH₄⁺, Ca²⁺, Na⁺, Mg²⁺ and K⁺ in the PM_2.5 were determinedby ion chromatography. The results showed during sample collection period r(PM_2.5) was (130.0±74.9)mg/m³. The average water-soluble ion concentration was (69.8±11.4)mg/m³, which accounted for 33.6% of r(PM_2.5). SO₄^2-, NO₃^- and NH₄⁺ were the main ions in PM_2.5, totally accounting for 89.7% of the water-soluble ions in autumn. With the air pollution getting serious, the concentration of water-soluble ions increased with the increase of ρ(PM_2.5), and the proportion of NO₃^-, NH₄⁺ and SO₄^2- increased gradually. Conversely the proportion of other ions decreased, and Ca²⁺ was especially obvious which indicated that ρ(PM_2.5) was mainly affected by secondary inorganic transformation. The average value of SOR and NOR during sample collection period were 0.36 and 0.25, respectively, and showed that the secondary transformation of SO₂ and NO₂ is seriously important and the secondary pollution was more serious. In addition, SOR and NOR are positively correlated with relative humidity and air temperature, and SOR is more sensitive to both. PM_2.5 in Xingtai City was slightly alkaline during autumn. NH₄⁺ were primarily in NH₄NO₃ and NH₄HSO₄ forms in PM_2.5. The N/S average value was 2.13, indicating that mobile source contributed more to PM_2.5 during autumn. PMF analysis revealed that secondary transformation, combustion and dust were the main potential sources of the ionic components of PM_2.5 during autumn in Xingtai City.

Key words： Xingtai City PM_2.5 water-soluble ions secondary transformation source analysis

Received: 10 October 2019

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X513

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	WANG Shao-bo
	WANG Han
	ZHANG Jing-qiao
	LI Hui
	WU Ya-jun
	LIU Rui-ze
	WANG Shu-lan

Cite this article:

WANG Shao-bo,WANG Han,ZHANG Jing-qiao等. Characterization analysis of PM_2.5 and water-soluble ions during autumn in Xingtai City[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(5): 1877-1884.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I5/1877

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