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題 名 | Evaluation of the Particles, Total PAHs during Day and Night Period in the Traffic Area of Taichung, Taiwan=臺中地區交通污染源懸浮微粒總PAHs濃度及乾沉降日夜間變化之探討 |
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作 者 | 方國權; 張鎮南; 張冠甫; | 書刊名 | 弘光學報 |
卷 期 | 31 1998.04[民87.04] |
頁 次 | 頁151-168 |
分類號 | 445.63 |
關鍵詞 | 懸浮微粒; 粗微粒; 細微粒; Suspended particle; Coarse particle; Fine particle; |
語 文 | 英文(English) |
中文摘要 | 本研究在台中市忠明國小的屋頂進行對總懸浮微粒、總PAHs之濃度的採樣及量測。採樣點的高度為一層樓高約(4公尺)。懸浮微粒粒徑分佈累積曲線之結果顯示,不論是白天或晚上在風速高的時候在粗微粒的部份會佔較大的比例。在總PAHs方面,在粒徑小於1�慆的部份白天和夜晚分別佔了63.8%及54.5%,同時在粒徑小於2.5�慆時白天和夜晚則分別佔了83.9%及71.2%。這數據顯示,不論在白天或黑夜總PAHs較容易會和細微粒(<2.5�慆)結合在一起。在總PAHs的組成方面在白天會在四個較大的高峰分別為從0.056到3.2�慆其相對的PAHs組成濃度為3274到5962�慊/g(平均5265�慊/g)。在晚上的部份則是有兩個較大的高峰,分別為0.056~0.31�慆及0.31~100�慆。總PAHs會和細微粒結合的原因為污染物的排放為一次污染物。在預測乾沈降通量的部份估計╱實測值之比值在白天及晚上分別為從0.23到1.28和從0.095到1.40。至於總PAHs方面估計╱實測值之比值針對2~7環之PAHs在白天分別為0.058,0.265,3.269,2.928,3.407及0.658。而在晚上則為0.026,0.372,0.547,0.823,1.369及7.672。 |
英文摘要 | The total suspended particle, total polycyclic aromatic hydrocarbons (PAHs) concentration were sampled and measured on the roof of Chung-Ming Elementary School. The sampling site is one store high (about 4m). The accumulative fraction phenomena explained that coarse particles occupied large portions of total particle mass for the day and night period at high wind Speed. The accumulative fraction (%) of total PAHs were 63.8 and 54.5% for particle size less than 1 �慆 in the day and night time :respectively. And were 83.9 and 71.2% for particle size less than 2.5�慆 in the day and night time, separately. The data showed that the total PAHs were tend to associate in the fine particle mode(<2.5�慆)during day and night time. In the ambient air, during the day time the major peak in particle size distribution for total PAH content is found in a peak size range between 0.056 and 3.2�慆, with PAH concentrations ranging from 3274 to 5962 �慊/g (average 5262 �慊/g). There were two particle size distribution modes (particle size ranged between 0.056~0.31 �慆 and 0.31~100�慆) for the total PAHs contents for the day and night. The fine particle mode was attributed to primary emissions from combustion sources, whereas the second was attributed to the accumulation of secondary reaction products on primary aerosol particles. The average estimated/measured dry deposition mass flux varied between 0.23 and 1.28 and between 0.095 and 1.40 in the day and night time, respective. The rations of estimate / measured of PAHs dry deposition flux which were divide into benzene rings were 0.058, 0.265, 3.269, 2.928, 3.407 and 0.658 fir 2~7 rings of PAHs in the day time, respectively. And were 0.026, 0.372, 0.547, 0.823, 1.369 and 7.672 for rings of PAHs in the night time, respectively. This is because the 2 rings of PAHs were mainly existed in the gas phase. However, dry deposition is contributed by the coarse particle phase thus caused the underestimation of the dry deposition for both day and nigh period. |
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