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首页> 外文期刊>International Journal of Environmental Research and Public Health >Characterization of Airborne Particles Collected from Car Engine Air Filters Using SEM and EDX Techniques
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Characterization of Airborne Particles Collected from Car Engine Air Filters Using SEM and EDX Techniques

机译：使用SEM和EDX技术表征从汽车发动机空气滤清器收集的空气中的颗粒

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摘要

Particulate matter accumulated on car engine air-filters (CAFs) was examined in order to investigate the potential use of these devices as efficient samplers for collecting street level air that people are exposed to. The morphology, microstructure, and chemical composition of a variety of particles were studied using scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX). The particulate matter accumulated by the CAFs was studied in two categories; the first was of removed particles by friction, and the second consisted of particles retained on the filters. Larger particles with a diameter of 74–10 μm were observed in the first category. In the second one, the detected particles had a diameter between 16 and 0.7 μm. These particles exhibited different morphologies and composition, indicating mostly a soil origin. The elemental composition revealed the presence of three groups: mineral (clay and asphalt), metallic (mainly Fe), and biological particles (vegetal and animal debris). The palynological analysis showed the presence of pollen grains associated with urban plants. These results suggest that CAFs capture a mixture of atmospheric particles, which can be analyzed in order to monitor urban air. Thus, the continuous availability of large numbers of filters and the retroactivity associated to the car routes suggest that these CAFs are very useful for studying the high traffic zones within a city.
机译：为了研究这些设备作为有效采样器收集人们所接触的街道空气的潜力，对汽车发动机空气滤清器（CAF）上堆积的颗粒物进行了检查。使用扫描电子显微镜（SEM）和能量色散X射线（EDX）研究了各种颗粒的形态，微观结构和化学组成。 CAF积累的颗粒物分为两类：第一种是通过摩擦去除的颗粒，第二种是保留在过滤器上的颗粒。在第一类中观察到较大的颗粒，直径为74–10μm。在第二个中，检测到的颗粒的直径在16到0.7μm之间。这些颗粒表现出不同的形态和组成，主要表明是土壤起源。元素组成揭示了三类物质的存在：矿物（粘土和沥青），金属（主要是铁）和生物颗粒（植物和动物残骸）。孢粉学分析表明存在与城市植物有关的花粉粒。这些结果表明，CAF可以捕获大气颗粒的混合物，可以对其进行分析以监控城市空气。因此，大量过滤器的连续可用性以及与汽车路线相关的追溯性表明，这些CAF对于研究城市内交通繁忙的区域非常有用。

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