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首页> 外文会议>Tenth International Conference on Modelling, Monitoring and Management of Air Pollution Jul, 2002 City of Segovia >Photochemical reactivity and sources of individual VOCs in Mexico City
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Photochemical reactivity and sources of individual VOCs in Mexico City

机译：墨西哥城的光化学反应性和单个VOC的来源

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摘要

Volatile organic compounds (VOCs) play a very important role in the photochemical production of atmospheric ozone. To developing cost-effective strategies aimed reducing ozone levels, the CMB model has been used to estimate the source contribution to the presence of total VOCs. Nevertheless, the photochemical importance and the origin of VOCs are not the same for all of them. In this paper, the relative contribution of VOCs to photochemical formation of ozone was examined in three sites of the Mexico City by ranking the VOCs according to their average concentration and the maximum incremental reactivity coefficients of each species. The most important compounds in the ozone formation in order of decreasing importance were: meta/para xylene, ethylene, toluene, 3 methyl 1butene, isopentane, 124 trimethylbenzene, propene, orthoxylene, toluene, nbutane, propane, 135 trimethylbenzene, and 1 butene. On the other hand, an assessment of the contribution of different sources to the observed concentration of the most abundant individual VOC was made by the application of the CMB model. Exhaust of gasoline and diesel powered vehicles were the most important sources to acetylene, ethylene, pentanes, nhexane, toluene and xylenes, although evaporative gasoline emissions contributed with more of 20% of npentane and isopentane. The major contributor to propane, nbutane and isobutane was the handling and distribution of LP gas. Food cooking contributed also to the presence of acetylene, ethylene, propane and butanes. Painting operations were emitters of toluene and nhexane. The results also showed that asphalting operation was an important source of xylenes and toluene.
机译：挥发性有机化合物（VOC）在大气臭氧的光化学生产中起着非常重要的作用。为了制定旨在降低臭氧含量的具有成本效益的策略，已使用CMB模型来估算源对总VOC的贡献。然而，光化学的重要性和VOC的来源并非全部相同。在本文中，根据墨西哥城的三个位置的挥发性有机化合物的平均浓度和最大增量反应系数，对它们进行了排名，从而研究了挥发性有机化合物对臭氧光化学形成的相对贡献。臭氧形成中最重要的化合物以重要性递减的顺序为：间/对二甲苯，乙烯，甲苯，3-甲基1-丁烯，异戊烷，124三甲基苯，丙烯，邻二甲苯，甲苯，正丁烷，丙烷，135三甲基苯和1丁烯。另一方面，通过使用CMB模型，评估了不同来源对观察到的最丰富的单个VOC浓度的贡献。汽油和柴油动力车辆的废气是乙炔，乙烯，戊烷，正己烷，甲苯和二甲苯的最重要来源，尽管蒸发的汽油排放占正戊烷和异戊烷的20％以上。丙烷，正丁烷和异丁烷的主要贡献来源是液化石油气的处理和分配。食物烹饪还促成乙炔，乙烯，丙烷和丁烷的存在。喷漆作业是甲苯和正己烷的排放者。结果还表明，沥青操作是二甲苯和甲苯的重要来源。

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