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8244064 
Journal Article 
兰州市低碳数正构烷烃组分特征及大气化学反应活性分析 
Qi, A; Zhou, X; Ma, X; Lei, C; Pang, W; Guan, X 
2020 
Chk 
Huanjing Kexue Yanjiu / Research of Environmental Sciences
ISSN: 1001-6929 
Editorial Board, Research of Environmental Sciences 
33 
2 
296-304 
Chinese 
In order to investigate the mass concentrations, the component characteristics and the atmospheric chemical reactivityof low-carbon n-alkanes in Lanzhou City, samples were collected by TENAX adsorption tube from November 2017 to June 2018 at five sampling points. The low carbon number normal n-alkanes in air samples were analyzed by thermal desorption-gas chromatography/massspectrometry (TD-GC/MS). The atmospheric chemical reactivity of low carbon number normal n-alkanes, including ozone generation potential, •OH consumption rate, and secondary organic aerosol generation potential, was evaluated. The characteristics of atmospheric reactivity contribution of the low carbon number normal n-alkanes were analyzed by the correlation analysis and factor analysis. The results showed that in the 10 low carbon normal n-alkanes, the contribution rate of n-hexane (C6) to OFP and the contribution rate of n-octane (C8) to •OH consumption rate are the largest, and the contribution ratios were 37.71% and 37.64%. n-octane (C8) has a large contribution rate to SOA formation (50.02%) in 10 low carbon number normal alkanes. The total mass concentration of the low carbon n-alkanes was significantly correlated with ozone generation potential (R=0.985) and OH radical consumption rate (R=0.948). Five unknown factors explained more than 94.511% of the chemical reactivity information by factor analysis, the amount of information contained also reflects the importance of unknown factors, which can provide a reference for further analysis of atmospheric chemical reactivity. The study shows that n-octane and n-hexane are the two key active components of the measured low carbon number normal n-alkanes (between C5-C19); n-octane is one of the compounds with the highest contribution to atmospheric chemical reactivity, and it is derived fromthe exhaust emissions ofautomobiles; N-hexane is a mixture of anthropogenic and natural sources. © 2020, Editorial Board, Research of Environmental Sciences. All right reserved. 
Chemical reactivity; Component characteristics; Lanzhou City; Low carbon number n-alkanes