沿海城市秋季大气甲醛污染来源及其环境影响

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Abstract The temporal variations and key influencing factors of atmospheric formaldehyde (HCHO) in autumn in the southeastern coastal city of Xiamen were investigated using online observation data of gaseous pollutants (HCHO, O₃, peroxyacetyl nitrate (PAN), CO, NO_x, isoprene) and the meteorological parameters (temperature, humidity, wind speed, wind direction) at an atmospheric environment supersite. The major sources of HCHO were identified quantitatively using the multilinear regression analysis method, and the contribution of HCHO to the formation of hydroxyl radical (·OH) was also estimated. It showed that the diurnal variation of HCHO displayed an obvious single-peak pattern, with the peak value appearing at around 13:00; and the concentrations of HCHO varied from 0.55×10^-9 to 7.96×10^-9 with an average concentration of (3.15±1.40)×10^-9. Significant positive correlations between O₃, PAN, and HCHO were observed. Temperature, humidity, and UV were the main meteorological factors affecting HCHO levels. Intense solar radiation, high temperature, low humidity, low wind speed, and southwest wind conditions favor the secondary formation of HCHO in Xiamen. The photolysis rate of HCHO (PHCHO) ranged from 0.01×10^-9/h to 3.02×10^-9/h, with a mean value PHCHO of 0.61×10^-9/h. The rate of HCHO photolysis to produce stable molecules of H₂ and CO was 1.1~1.6 times that of H· and HCO· free radicals. The primary sources of atmospheric HCHO in the autumn of Xiamen included secondary formations (39.2%), direct emissions (26.6%), and regional background (34.2%). During the daytime in autumn, the average ·OH formation rates from the photolysis of HONO, O_3, and HCHO were 1.86×10^-9/h, 1.11×10^-9/h, and 0.70×10^-9/h, respectively. And the production rate of OH caused by HCHO photolysis (P(OH_HCHO)) accounted for 10%~21% of the total ·OH formation rate.

Key words： formaldehyde pollution characteristics source atmospheric oxidation capacity coastal city

Received: 15 June 2022

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X511

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	Articles by authors
	LIN Yi-ling
	HONG You-wei
	JI Xiao-ting
	XU Ke
	SHAO Zhi-qian
	YU Rui-lian
	CHEN Jin-sheng

Cite this article:

LIN Yi-ling,HONG You-wei,JI Xiao-ting等. Pollution characteristics of atmospheric formaldehyde (HCHO) and its environmental effects in autumn in a coastal city[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 52-60.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I1/52

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