济南市区典型污染时期大气中醛酮化合物的组分特征及生成机制

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Abstract Carbonyl compounds in the atmosphere at two different urban sites (Jianda and Chuangyeyuan) of Jinan were synchronously collected using 2,4-dinitrophenylhydrazine sampling tubes during a typical summer ozone pollution period (from June 14 to 22, 2022) and quantified using high-performance liquid chromatography. The photochemical reactions of major carbonyls were simulated with the Observation-based model (OBM) to identify the secondary formation pathways and critical precursors of these carbonyl compounds. The total concentration of carbonyl compounds was (19.78±9.83)×10^-9 of which formaldehyde, acetaldehyde, and acetone accounted for 36.75%, 21.39% and 14.64%, respectively. The formaldehyde concentration showed "double peak" characteristics at noon and night in Jianda and had a peak change in morning and evening in Chuangyeyuan, exhibiting relatively higher concentrations at night and minimal concentrations around noontime. The concentration ratios of formaldehyde to acetaldehyde (C1/C2) of the two urban sites were 1.97 and 1.47, respectively. The concentration ratios of acetaldehyde to propionaldehyde (C2/C3) of the two sites were 9.27 and 8.76, respectively. The maximum formation rate was simulated to be 6.17×10^-9h^-1 for formaldehyde, 1.67×10^-9h^-1 for acetaldehyde, and 0.66×10^-9h^-1 for acetone; and the alkoxy radical (RO)+O₂ reaction was the main secondary formation pathway. We also observed that alkene had an important effect on the secondary formation of formaldehyde and acetaldehyde in the atmosphere; and ethylene, isoprene, and propylene were important precursors of formaldehyde, while propylene and 2-butylene served as precursors of acetaldehyde. Obviously, effectively controlling artificial alkene emissions from industries will help mitigate the secondary formation of major carbonyl compounds in the atmosphere.

Key words： carbonyl compounds composition characteristics photochemical reaction formation mechanism OBM O₃

Received: 26 June 2023

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X511

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	YAN Huai-zhong
	WANG Jie
	SHI Jing-hua
	CAO Yan-yan
	YOU Xi-hua
	WEI Xiao-feng
	LIU Shi-jie
	ZHANG Gui-qin

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YAN Huai-zhong,WANG Jie,SHI Jing-hua等. Component characteristics and formation mechanism of carbonyl compounds in the atmosphere during a typical pollution period in Jinan urban area[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(1): 72-82.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I1/72

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