Chemical characteristics of PM2.5-0.3 and PM0.3 and consequence of a dust storm episode at an urban site in Lebanon
Chemical characteristics of PM2.5-0.3 and PM0.3 and consequence of a dust storm episode at an urban site in Lebanon
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DOI：
10.1016/j.atmosres.2016.06.001
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发表时间：
2016-11-01
影响因子：
5.5
通讯作者：
Courcot, Dominique
中科院分区：
文献类型：
--
作者：
Borgie, Mireille;Ledoux, Frederic;Courcot, Dominique
黎巴嫩首都贝鲁特的城市群位于地中海盆地东侧，三大洲之间循环的气团交汇处，是空气污染的重要调查区域，需要更多的研究来阐明对人类致癌的最小颗粒物的成分。 PM2.5-0.3和PM0.3样本是在沙尘暴发生后春夏季期间在贝鲁特城市背景地点采集的，并测定了其化学成分。我们的研究结果表明，由气体到颗粒物转化（SO42- 和 NH4+）形成的以及与燃烧过程相关的成分主要存在于 PM0.3 组分中。典型的地壳（Ca2+、Fe、Ti、Mg2+）、海盐（Na+、Cl-、Mg2+、Sr）物种和 NO3- 主要与 PM2.5-0.3 组分相关。我们还证明，2011年5月发生在黎巴嫩的沙尘事件源于研究最少的伊拉克和叙利亚沙漠，在第一个采样周期开始时对PM2.5-0.3的成分产生了直接影响，然后通过沉积的沙尘颗粒的重新悬浮产生了间接和持续的影响。此外，PM0.3 中的 PAH 浓度远高于 PM2.5-0.3，其成分似乎受到柴油（公共汽车、卡车和发电机组）和汽油（私家车）排放的影响。 (C) 2016 Elsevier B.V. 保留所有权利。
Located on the eastern side of the Mediterranean Basin at the intersection of air masses circulating between three continents, the agglomeration of Beirut, capital of Lebanon is an important investigating area for air pollution and more studies are needed to elucidate the composition of the smallest particles classified as carcinogenic to humans. PM2.5-0.3 and PM0.3 samples were collected during the spring-summer period in an urban background site of Beirut, after a dust storm episode occurred, and their chemical composition was determined. Our findings showed that components formed by gas to particle conversion (SO42- and NH4+) and related to combustion processes are mainly found in the PM0.3 fraction. Typical crustal (Ca2+, Fe, Ti, Mg2+), sea-salt (Na+, Cl- , Mg2+, Sr) species, and NO3- are mainly associated with the PM2.5-0.3 fraction. We have also evidenced that the dust episode which occurred in Lebanon in May 2011 originated from the Iraqian and Syrian deserts, which are the least studied, and had a direct influence on the composition of PM2.5-0.3 during the beginning of the first sampling period, and then an indirect and persistent influence by the re-suspension of deposited dust particles. Moreover, PAHs concentrations were much higher in PM0.3 than in PM2.5-0.3 and their composition appeared influenced by diesel (buses, trucks and generator sets) and gasoline (private cars) emissions. (C) 2016 Elsevier B.V. All rights reserved.