Profiling Characteristics of Airborne Polycyclic Aromatic Hydrocarbons in Beijing, Yinchuan and Chengdu, China
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概要
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Polycyclic aromatic hydrocarbons (PAHs) in 63 samples of airborne particulate matter collected from 1998 to 2000 in Beijing, Yinchuan and Chengdu, China were analyzed. The average concentrations of total PAHs (Σ23PAHs) found in the air samples were 323±431 ng/m<SUP>3</SUP> (545±592μg/g) in Beijing, 898±902ng/m<SUP>3</SUP> (1135± 1357μg/g) in Yinchuan and 249±203ng/m<SUP>3</SUP> (566±321μg/g) in Chengdu. The airborne concentrations of PAHs in China were approximately 35 to 450 times higher than those collected during the same time period in Okayama, Japan, 20 to 80 times higher than those of Santiago, Chile, and were similar to those of Chicago which is influenced by surrounding heavy industry. Seasonal variation was observed in the concentration profiles of PAHs and the ratios of individual PAHs to total PAHs for the three cities. The ratio of 4-ring PAHs to total PAHs increased in winter: it is recognized that coal-burning (for heating in winter) yields higher ratios of 4-ring PAHs to total PAHs than does petroleum combustion. The ratios of the concentrations of the individual PAHs to the benzo [e] pyrene concentration (BeP ratio) and significant molecular diagnostic ratios were used to fingerprint the airborne PAHs in the three cities, and these were compared with the patterns of the different sources. The ratios patterns from coal combustion were evident in the samples from all three cities. Additionally, the characteristic pattern from automobile exhaust was evident in Beijing, that from coal used for steam power generation was seen in Chengdu, and that from domestic coal-burning was predominant in Yinchuan.
- 日本環境化学会の論文
日本環境化学会 | 論文
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