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首页> 外文期刊>Journal of Environmental Management >Determination of VOC source signature of vehicle exhaust in a traffic tunnel
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Determination of VOC source signature of vehicle exhaust in a traffic tunnel

机译：确定交通隧道内车辆尾气的VOC源特征

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摘要

This study describes the methodology used to obtain the volatile organic compound (VOC) source signature of vehicle exhaust. To accomplish this, C-2-C-9 VOCs were measured in a traffic tunnel located in Seoul, South Korea. The effect of VOC concentrations from the outside ambient air was considered in the determination of the source signature. To examine the effects of ambient air on VOC concentrations inside the tunnel, the ratio of propane to the total VOC concentrations was compared between the entrance and middle sites in the tunnel. Propane was used as a standard not only because of its insignificant contribution to vehicle exhaust gas, but also the fact that propane is the most abundant VOC in the atmosphere of Seoul. The ratio of propane to the total VOC concentrations was higher at the entrance site than at the middle location by, on average, 60%. This suggests that ambient air affects the inside tunnel air to a greater extent at the entrance site as compared to the middle site. The contribution of ambient air to the air inside the tunnel at the entrance location varied from 30% to 67%, with an average of 55%. This is 1.5 times higher than the value measured at the middle location, which ranged from 20% to 48%, with an average of 36%. This shows that ambient air substantially affects the inside air of the tunnel. Excluding the effects of ambient air on the air inside the tunnel can provide an improved chemical composition for vehicle exhaust using tunnel measurements. We believe that the concentration difference between the two sites within the tunnel provides a more accurate chemical composition of vehicle exhaust as compared to that obtained from a measurement taken at only one point inside the tunnel. (c) 2006 Elsevier Ltd. All rights reserved.
机译：这项研究描述了用于获得车辆排气中挥发性有机化合物（VOC）源特征的方法。为此，在位于韩国首尔的一个交通隧道中对C-2-C-9 VOC进行了测量。确定来源特征时要考虑来自外部环境空气中VOC浓度的影响。为了检查环境空气对隧道内VOC浓度的影响，比较了隧道入口和中间位置丙烷与总VOC浓度的比率。丙烷之所以被用作标准品，不仅是因为它对汽车尾气的贡献不大，而且丙烷是首尔大气中最丰富的VOC。丙烷与进口VOC总浓度的比率平均比入口处高60％。这表明，与中间站点相比，环境空气在入口站点对隧道内部空气的影响更大。入口处隧道内空气对环境空气的贡献从30％到67％不等，平均为55％。这是中间位置测得的值的1.5倍，中间值的范围是20％至48％，平均为36％。这表明环境空气显着影响隧道的内部空气。排除环境空气对隧道内部空气的影响，可以使用隧道测量为车辆排气提供改进的化学成分。我们认为，与从仅在隧道内一个点进行测量所获得的化学成分相比，隧道内两个站点之间的浓度差提供了更准确的车辆尾气化学成分。 （c）2006 Elsevier Ltd.保留所有权利。

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