| Title: | Differences in compositions and effects of VOCs from vehicle emission detected using various methods |
| Author(s): | Niu Z; Kong S; Zheng H; Hu Y; Zheng S; Cheng Y; Yao L; Liu W; Ding F; Liu X; Qi S; |
| Address: | "Department of Atmospheric Sciences, School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan, 430078, China. Department of Atmospheric Sciences, School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan, 430078, China; Research Centre for Complex Air Pollution of Hubei Province, Wuhan, 430078, China. Electronic address: kongshaofei@cug.edu.cn. Department of Atmospheric Sciences, School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan, 430078, China; Research Centre for Complex Air Pollution of Hubei Province, Wuhan, 430078, China. Hubei Province Academy of Eco-Environmental Sciences, Wuhan, 430072, China" |
| DOI: | 10.1016/j.envpol.2023.122077 |
| ISSN/ISBN: | 1873-6424 (Electronic) 0269-7491 (Linking) |
| Abstract: | "Vehicle exhaust and oil fuel evaporation emit volatile organic compounds (VOCs). The differences in VOC compositions and their effects determined using different methods have not been addressed sufficiently. In this study, VOC samples are obtained from single gasoline and diesel vehicle exhausts using a portable emission measurement system, from a tunnel in Yichang City, and from gasoline and diesel evaporation at gas stations. A total of 107 VOCs are analysed. The calculated VOC source profiles (based on VOC source profiles of single-vehicle type and vehicle fleet composition in the tunnel) and the tested source profiles (from a tunnel test) are compared. The results show that gasoline burning can reduce alkenes from a mass fraction of 53.1% (for evaporation) to 3.6% (for burning), as well as increase the mass fraction of alkenes from 1.3% (for diesel evaporation) to 34.0% (for diesel burning). The calculated VOC source profiles differed from the tested VOC source profiles, with a coefficient of divergence of 0.6. Ethane, ethylene, n-undecane, and n-dodecane are used to distinguish VOCs in gasoline and diesel exhausts. Cis-2-butene, 2-methylpentane, m/p-xylene, o-xylene, and n-decane can be used to separate gasoline from diesel. The xylene/ethylbenzene ratios accurately reveal the photochemical age. Gasoline burning increases health risks associated with VOCs compared with gasoline evaporation. Furthermore, it modifies the main contributor to ozone formation potential. This study is expected to facilitate refined VOC source apportionment and studies pertaining to speciated emission inventories" |
| Keywords: | Vehicle Emissions/analysis *Volatile Organic Compounds/analysis *Air Pollutants/analysis Gasoline/analysis *Ozone/analysis Alkenes/analysis Environmental Monitoring China Gasoline and diesel evaporation Health risk Source analysis Tunnel test Vehicle exha; |
| Notes: | "MedlineNiu, Zhenzhen Kong, Shaofei Zheng, Huang Hu, Yao Zheng, Shurui Cheng, Yi Yao, Liquan Liu, Wei Ding, Feng Liu, Xiaoyong Qi, Shihua eng England 2023/06/22 Environ Pollut. 2023 Sep 15; 333:122077. doi: 10.1016/j.envpol.2023.122077. Epub 2023 Jun 19" |
