A comparison of temporal variation of particle-bound polycyclic aromatic hydrocarbons (pPAHs) concentration in different urban environments: Tokyo, Japan, and Bangkok, Thailand
A comparison of temporal variation of particle-bound polycyclic aromatic hydrocarbons (pPAHs) concentration in different urban environments: Tokyo, Japan, and Bangkok, Thailand
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DOI：
10.1016/s1352-2310(02)00099-7
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发表时间：
2002-04-01
影响因子：
5
通讯作者：
Yamamoto, K
中科院分区：
文献类型：
--
作者：
Chetwittayachan, T;Shimazaki, D;Yamamoto, K
利用光电气溶胶传感器（PAS）对日本东京和泰国曼谷夏季道路附近的颗粒物结合多环芳烃（pPAHs）的实时环境浓度进行了对比研究。PAS输出与通过气相色谱/质谱（GC/MS）测定的所选多环芳烃的总浓度具有良好的相关性。然后，该技术被用来观察总pPAHs的时间变化。分别于2000年8月和2001年3月在东京和曼谷的路边和一般地区进行了连续7天的测量。两个城市的pPAHs浓度的日变化曲线基本相似;明确的峰值浓度出现在清晨，与早高峰时段的交通量增长有关。一个显着的减少发生在白天可能是由于上升的混合区。在路边地区，平均pPAHs浓度在整个采样期间在曼谷显着高于东京，由于较大的贡献，车辆交通，特别是重型车辆，在采样点附近的道路上。除此之外，东京一般地区的所有平均浓度都略高于曼谷。这可能是由于东京的道路覆盖率高于曼谷，使得pPAHs更有可能从道路交通中演化出来，并且东京pPAHs的迁移模式比曼谷更广泛。这表明pPAH在东京的整个研究区域广泛分布。然而，在这项研究的规模，特别是在路边，在东京和曼谷观察到的高pPAHs浓度主要位于低风速，< 1.0和0.4 m s（-1），分别，和沿着从道路的方向。(C)2002爱思唯尔科技有限公司版权所有。
A comparative study of the real-time ambient concentrations of particle-bound polycyclic aromatic hydrocarbons (pPAHs) in the vicinity of roads in Tokyo (Japan) and in Bangkok (Thailand) in summertime was carried out by using a photoelectric aerosol sensor (PAS), which gives continuous signal in relation to the total amount of pPAHs concentration. The PAS Output gave a good correlation to the total concentration of the selected PAHs determined by gas chromatography/mass spectrometry (GC/MS). This technique was then employed to observe temporal variation of total pPAHs. The measurements at roadside and general areas in Tokyo and in Bangkok were performed for seven Consecutive days in August 2000, and in March 200 1, respectively. The diurnal profiles of pPAHs concentrations in both cities were generally similar; explicit peak concentrations were observed in early morning in association with the traffic growth in the morning rush hours. A significant reduction occurred during the daytime was probably due to rising in the mixing zone. At roadside areas, the average pPAHs concentrations throughout the sampling period in Bangkok were significantly higher than those of Tokyo, owing to the larger contribution of vehicular traffic, especially heavy-duty vehicles, on the roads near the sampling site. Otherwise, all average concentrations in the general area in Tokyo were slightly higher than that of Bangkok. This was probably due to the percentage of road coverage in Tokyo being higher than that in Bangkok, creating a higher possibility for pPAHs evolving from road traffic, and the transportation pattern of the pPAHs in Tokyo showed a more broadly diffused profile than that of Bangkok. This suggests the widespread dispersion of pPAHs over the entire study area in Tokyo. At this study scale especially at the roadside, however, a high pPAHs concentration observed in Tokyo and in Bangkok was predominantly located at low wind speed, < 1.0 and 0.4 m s(-1), respectively, and along the direction from the roads. (C) 2002 Elsevier Science Ltd. All rights reserved.