珠江三角洲光化学活跃期甲醛及其前体物的源解析研究

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Abstract Based on three representative Air Quality Monitoring supersites in the Pearl River Delta (PRD) region (Dongcheng urban station in Dongguan, Lianhuashan urban station in Shenzhen and Huaguoshan rural station in Heshan), we monitored and analyzed spatial-temporal variation characteristics of formaldehyde (HCHO) and its precursor volatile organic compounds (VOCs) during the active period of atmospheric photochemistry from May to October 2021. This study analyzed the sources of HCHO by multiple linear regression, identified its key VOCs precursors and their contributions, and compared the differences in the sources and precursors of HCHO between three sites. There were obvious differences in the volumetric concentrations of HCHO among the three sites, with the highest concentration in Huaguoshan reaching 5.82×10^-9. Compared with the historical data, the HCHO concentration in the rural Huaguoshan site was elevated, while the HCHO concentrations in the urban Dongcheng and Lianhuashan sites were decreased. There was a certain correlation between O₃ and HCHO concentrations. In September, when the ozone concentration was the highest, the concentration of HCHO was also increased. In addition, the HCHO concentration on ozone exceedance days was significantly higher than those on ozone non-exceedance days. Using the multiple linear regression method, and selecting toluene, isoprene and O₃ as source tracers, it was obtained that the secondary sources contributed the most to the HCHO formation, with the proportion ranging from 43.5% to 54.9%. The proportion of secondary sources at the rural site was higher than that of the other two urban sites. Based on the production yields method, the precursors of the secondary formation of HCHO at each site are mainly olefins, of which the largest contribution was from isoprene, followed by ethylene and propylene. In comparison, it was speculated that the decrease in anthropogenic sources of HCHO led to the decrease of HCHO concentrations at urban sites, while the higher contribution of secondary sources led to an increase of HCHO concentration at the rural site. These results suggested that it was necessary to focus on the control of the anthropogenic source of HCHO and its precursors such as isoprene, styrene and ethylene.

Key words： the Pearl River Delta Air Quality Monitoring supersite HCHO source apportionment multiple linear regression

Received: 26 September 2022

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	LIAO Tong
	LIN Yu-jun
	JI Wen-hao
	LIU Yu
	WANG Bo-guang

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LIAO Tong,LIN Yu-jun,JI Wen-hao等. Research on the sources of formaldehyde and its precursors during the active period of atmospheric photochemistry in the Pearl River Delta[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(12): 5533-5541.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I12/5533

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