Non-methane Hydrocarbons and Their Ozone Formation Potentials in Foshan, China
作者： Ji-Hua Tan , Song-Jun Guo , Yong-Liang Ma , Fu-Mo Yang , Ke-Bin He
DOI: 10.4209/AAQR.2011.08.0127
关键词:
摘要: Concentrations of non-methane hydrocarbons (NMHCs) were measured to investigate their temporal variations and major sources, explore the ozone formation potentials (OFP) each NMHCs for first time in December 2008 Foshan. Ethane, propane, n-butane, i-pentane, 2,3-dimethylbutane, ethene, propene, ethyne, benzene toluene 10 most abundant hydrocarbons, accounting 82% concentration total NMHCs. these as well fractional contributions higher morning evening than afternoon, consistent with vehicle volumes during periods. This suggests that vehicular emission was likely source at this site. The mean B/T ratio (0.45 ± 0.24) further supported main ambient except aromatic hydrocarbons. These mainly from solvent evaporation, indicated by diurnal ratios m/p-xylene benzene. results factor analysis also showed combustion process usage sources On average, Prop-Equiv OFP 153.0 ppbc 863.4 μg/m 3 , respectively. Based on MIR (maximum incremental reactivity) scale, leading contributors decreasing concentrations toluene, m/p-xylene, 1-butene, ethylbenzene, o-xylene, 2,3-dimethylbutane trans-2-butene, which explained 77% OFP. Ranking Prop-Equiv, top species m/pxylene, isoprene, trans-2-butene 66% Prop-Equiv. Thus, alkenes played important role O3 formation, followed aromatics alkanes study periods
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