Abstract:A continuous observation campaign was carried out with the GC5000 volatile organics online monitoring system from March 1, 2013 to February 28, 2014 in the northern suburb of Nanjing, characteristics of their composition, seasonal variation and diurnal variation were analyzed, PMF, the maximum incremental reactivity coefficient (MIR)and the fractional aerosol coefficients (FAC)were used to estimate the potential formation of secondary organic aerosols (SOA) and O3 from VOCs and their sources. The results showed that the hourly average mixing ratio of the TVOCs was 45.63×10-9. There was an obvious seasonal cycle of VOCs, with the maximum in winter and autumn and minimum in summer. Diurnal variation of VOCs mixing ratios showed a very clear bimodal structure. The SOA concentration values obtained by the VOCs were 2.07μg/m3, as the largest contributor, aromatic hydrocarbons accounted for 95.93% and BTEX are the dominant species. Alkenes contributed the largest parts of the ozone formation potential (OFP), closing to 65%. Although alkanes were the most abundant components of VOCs, it is not the main contributor of OFP and SOA. The results from different seasons of receptor model showed that vehicle emissions and industrial emissions were main sources of VOCs in the northern suburb of Nanjing. The sources which contain rich BTEX contributed the largest parts of SOA. Moreover, the sources which contain rich ethylene, propylene and isoprene are the largest contributor of OFP. Vehicle emissions and industrial emissions (including the petrochemical industry) were the main contributor to the concentrations of VOCs, SOA and OFP in spring, autumn and winter. As the influential sources to SOA and OFP, solvent source and plant source should not be overlooked in summer.
林旭, 朱彬, 安俊琳, 杨辉. 南京北郊VOCs对臭氧和二次有机气溶胶潜在贡献的研究[J]. 中国环境科学, 2015, 35(4): 976-986.
LIN Xu, ZHU Bin, AN Jun-Lin, YANG Hui. Potential contribution of secondary organic aerosols and ozone of VOCs in the Northern Suburb of Nanjing. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(4): 976-986.