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題名 | Dry Deposition and Particle Size Distribution of PAHs in Both Petrochemical-industry and Urban Areas=石化區與都會區大氣中多環芳香烴化合物之粒徑分佈及乾沉降研究 |
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作者 | 許蕙琳; 李文智; | 書刊名 | 中國環境工程學刊 |
卷期 | 8:2 1998.06[民87.06] |
頁次 | 頁129-142 |
分類號 | 445.63 |
關鍵詞 | 電腦模擬; 乾沉降; 粒徑分佈; 多環芳香烴化合物; 石化區; 都會區; 大氣; Monitoring; Dry deposition; Particle size distribution; PAHs; Petrochemical plant; Urban; Ambient air; |
語文 | 英文(English) |
中文摘要 | 本研究於台南石化區及都會區,分別以兩部MOUDI採樣器,一部NRI採樣器、 兩部PS-1採樣器及兩組乾沉降板,進行大氣中多環芳香烴化合物(PAHs)之粒烴分佈及乾沉 降率測定,進而以電腦模式模擬各粒徑區間PAHs之乾沉降貢獻百分比。PAHs之定性及定 量分析係以氣相層析質譜儀(GC/MS)為之。 都會區大氣中21種個別PAH之MMD (mass median diameter)值,絕大部份要比石化區 大氣中21種個別PAH之MMD值來得小,此因都會區大氣中有較多來自於汽機車排氣而吸 附在較小粒徑微粒上之PAHs。由電腦模擬之總PAHs乾沉降率累積百分比結果顯示,氣相 PAHs之乾沉降貢獻率在石化區與都會區分別為5.16%與4.22%;通常,分子量較小之PAHs 有較高之氣相貢獻率,自BkF至COR屬於分子量較大之PAHs,其氣相乾沉降之貢獻率均 小於0.5%。大氣中懸浮微粒及總PAHs乾沉降率之電腦模擬預測值與實測值非常接近,可 知本模式對於PAHs在氣相及微粒粒徑範圍0.056-100μm之乾沉降率有一很好之預測結果。 約有87.5%之總PAHs乾沉降率是由粒徑大於10μm之微粒所貢獻,其主要原因為大於10 μm之微粒有較大之乾沉降速度(>6.9cm/sec),因此控制了絕大部份之乾沉降率。 |
英文摘要 | This study was undertaken to characterize the particle size distributions and dry deposition of PAHs (polycyclic aromatic hydrocarbons) in a petrochemical industry (PCI) site and an urban area in southern Taiwan. The dry deposition plate with a smooth surface was always pointed into the wind. Twenty-one individual PAHs were analyzed primarily by using a gas chromatograph/mass spectrometer (GC/MS). The MMDo (mass median diameter) of individual PAHs measured at the urban site were lower than that measured at the PCI site. This can be explained that, in the ambient air of urban area, the fraction of PAHs emitted from mobile exhaust was greater in the submicron particulates than that in the PCI site. For total PAHs, the cumulative fraction (F%) of dry deposition flux contributed by the gas phase were 5.16% and 4.22% for the PCI and urban site, respectively. In general, lower molecular weight PAHs had a greater greater fraction of dry deposition flux contributed by the gas phase. For higher molecular weight PAHs- BkF, BeP, BaP, PER, IND, DBA, BbC, BghiP and COR – the cumulative fraction (F%) of dry deposition flux contributed by the gas phase was less than 0.5%. By using the particle size distribution data, the dry deposition flux of total particle mass and total PAHs. More than 87.5% of total PAH drydeposition flux is contributed by particle diameters larger than 10μm have higher dry deposition velocities (>6.9 cm sec ) and control the majority of dry deposition flux. |
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