Department of Chemistry, Inha University, Yonghyun-dong, Incheon, Korea.
Indoor Air. 2011 Feb;21(1):12-24. doi: 10.1111/j.1600-0668.2010.00677.x.
In this study, single-particle characterization of aerosol particles collected at an underground shopping area was performed for the first time. A quantitative single-particle analytical technique, low-Z particle electron probe X-ray microanalysis, was used to characterize a total of 7900 individual particles for eight sets of aerosol samples collected at an underground shopping area in Seoul, Korea. Based on secondary electron images and X-ray spectral data of individual particles, fourteen particle types were identified, in which primary soil-derived particles were the most abundant, followed by carbonaceous, Fe-containing, secondary soil-derived, and secondary sea-salt particles. Carbonaceous particles exist in three types: organic carbon, carbon-rich, and CNO-rich. A significant number of textile particles with chemical composition C, N, and O were encountered in some of the aerosol samples, which were from the textile shops and/or from clothes of passersby. Primary soil-derived particles showed seasonal variation, with peak values in spring samples, reflecting higher air exchange between indoor and outdoor environments in the spring. Secondary soil-derived, secondary sea-salt, and ammonium sulfate particles were frequently encountered in winter samples. Fe-containing particles, contributed from a nearby subway station, were in the range of about 19% relative abundances for all samples.
In underground shopping areas, particulate matters can be a considerable health hazard to the workers, shoppers, passersby, and shop-keepers as they spend their considerable time in this closed microenvironment. However, no study on the characteristics of indoor aerosols in an underground shopping area has been reported to our knowledge. This work provides detailed information on characteristics of underground shopping area aerosols on a single particle level.
本研究首次对地下购物区采集的气溶胶颗粒进行了单颗粒特征描述。使用低 Z 粒子电子探针 X 射线微分析定量单颗粒分析技术，对在韩国首尔地下购物区采集的 8 组气溶胶样本中的 7900 个单个颗粒进行了特征描述。根据单个颗粒的二次电子图像和 X 射线能谱数据，共识别出 14 种颗粒类型，其中主要的土壤衍生颗粒最为丰富，其次是含碳、含铁、次生土壤衍生和次生海盐颗粒。含碳颗粒存在三种类型：有机碳、富碳和 CNO 富碳。在一些气溶胶样本中遇到了大量化学成分 C、N 和 O 的纺织颗粒，这些颗粒来自纺织店和/或路人的衣服。主要的土壤衍生颗粒具有季节性变化，春季样本的峰值最高，反映出春季室内外空气交换增加。次生土壤衍生、次生海盐和硫酸铵颗粒在冬季样本中频繁出现。来自附近地铁站的含铁颗粒的相对丰度约为所有样本的 19%。
在地下购物区，由于工人、购物者、路人以及店主在这个封闭的微环境中花费大量时间，颗粒物可能对他们的健康构成相当大的危害。然而，据我们所知，目前还没有关于地下购物区室内气溶胶特征的研究。这项工作提供了关于地下购物区气溶胶特征的详细信息，达到了单颗粒水平。
