Gas¨Cparticle concentrations of atmospheric polycyclic aromatic hydrocarbons at an urban and a residential site in Osaka, Japan: Effect of the formation of atmospherically stable layer on their temporal change
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- 作者：Masao ; Kishidaa ; ; b ; ; kishida82477@iris.eonet.ne.jp ; Ayako ; Nishikawac ; Keiichi ; Fujimoric ; Yasuhiko ; Shibutanic
- 关键词：Atmospherically stable layer ; Gas&ndash ; particle partitioning ; Japan ; Polycyclic aromatic hydrocarbons ; Osaka
- 刊名：Journal of Hazardous Materials
- 出版年：2011
- 出版时间：15 September 2011
- 年：2011
- 卷：192
- 期：3
- 页码：1340-1349
- 全文大小：932 K
文摘
A comparative study on atmospheric polycyclic aromatic hydrocarbons (PAHs) in particulate matter and the gaseous phase was performed at an urban and a residential site in Osaka, Japan, during 2005?006. PAH concentrations at the urban site were found to be approximately twice higher than those at the residential site. At both sites, particulate PAH concentrations increased mainly in winter while the trends of temporal change in gaseous PAH concentrations were not clearly observed. The main sources of PAHs were estimated to be local traffic, e.g., diesel engines with catalytic converter. PAH concentrations did not significantly negatively correlate with ozone concentrations and meteorological parameters. Gas¨Cparticle partitioning coefficients of representative PAHs with low molecular weight (LMW) significantly negatively correlated with ambient temperature, showing that temporal change in the LMW PAH concentrations in PM could be attributable to the shift of their gas¨Cparticle distribution caused by the change in ambient temperature. For the first time, we studied the effect of the formation of atmospherically stable layer following an increase in PAH concentrations in Japan. At the urban site, PAHs showed a significant positive correlation with potential temperature gradients, indicating that temporal variability in PAH concentrations would be dominantly controlled by the formation of atmospherically stable layer in Osaka area.