Characterizing carbonyl compounds and their sources in Fuzhou ambient air, southeast of China

In recent years, ozone (O.sub.3 ) concentrations in the southeastern coastal areas of China have shown a gradual upward trend. As precursors and intermediates in the formation of O.sub.3 , carbonyl compounds play key roles in the atmospheric photochemical oxidation cycle. To explore the main polluti...

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Bibliographic Details
Published in:PeerJ (San Francisco, CA) CA), 2020-11, Vol.8, p.e10227-e10227, Article e10227
Main Authors: He, Zhen, Zhang, Xin, Li, Yunfeng, Zhong, Xuefen, Li, Hong, Gao, Rui, Li, Jinjuan
Format: Article
Language:English
Subjects:
Acetaldehyde
Acetone
Aerosols
Atmospheric Chemistry
Calibration
Carbonyl compounds
Coastal zone
Emissions
Environmental Contamination and Remediation
Environmental Impacts
Environmental protection
Formaldehyde
Fuzhou
High performance liquid chromatography
Hydrocarbons
Intermediates
Oxidation
Ozone
Propionaldehyde
Source apportionment
VOCs
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Summary:In recent years, ozone (O.sub.3 ) concentrations in the southeastern coastal areas of China have shown a gradual upward trend. As precursors and intermediates in the formation of O.sub.3 , carbonyl compounds play key roles in the atmospheric photochemical oxidation cycle. To explore the main pollution characteristics of carbonyl compounds in a typical coastal city in southeast China, ambient samples were collected in Fuzhou (the provincial capital of Fujian province, located on the southeast coast of China) and analyzed using high-performance liquid chromatography with ultraviolet detection. The study was continuously carried out at an urban site (Jinjishan) and a suburban site (Gushan) in Fuzhou from May 8 to 20, 2018. The total concentration of 16 carbonyl compounds at the urban site was 15.45±11.18 ppbv, and the total concentration at the suburban site was 17.57±12.77 ppbv. Formaldehyde (HCHO), acetaldehyde, and acetone were the main species detected in the samples, and acetone had the highest concentration among the species detected. The suburban site had a higher formaldehyde/acetaldehyde ratio and lower acetaldehyde/propionaldehyde ratio than the urban site, implying that biogenic sources potentially contributed to the carbonyl compound concentrations at the suburban site. The results of an observation-based model showed that anthropogenic hydrocarbons promoted HCHO production on May 17 at the urban site. Compared to biogenic emissions, anthropogenic activity is a more important source of carbonyl compounds.
ISSN:2167-8359
2167-8359
DOI:10.7717/peerj.10227