Source Apportionment of Particulates Collected from Urban Artificial Space by Analysis of Individual Particles

• Published in: ENVIRONMENTAL SCIENCE Vol. 7; no. 1; pp. 53 - 58
• Main Authors: TOMIYASU, Bunbunoshin, LIU, Guo-Lin, UCHIYAMA, Shunichi, SUGIMOTO, Nobuyuki, OWARI, Masanori, NIHEI, Yoshimasa
• Format: Journal Article
• Language: Japanese
• Published: SOCIETY OF ENVIRONMENTAL SCIENCE, JAPAN 1994; 社団法人 環境科学会
• Subjects: artificial space, particulates , analysis of individual particles, source apportionment; 人工空間,SPM,EPMA,粒別分析,起源解析
• ISSN: 0915-0048; 1884-5029
• DOI: 10.11353/sesj1988.7.53

Source apportionment was performed on a small amount of particulates collected in subway platforms and their surroundings . We collected samples on three types of subway stations : a station with well ventilated by the piston movement of trains, a station of the third rail subway system, and a deep station with well air-conditioned. In this study, we used a personal air sampler for 30 minutes-sampling period . Samples were collected at the center of the platform, the ground level near the entrance, and the intermediate level between the entrance and the platform of each station . Two sets of samples were collected on the well ventilated station at different time period daytime and evening rush hour. From the results of the mass concentration measurements, it was clearly shown that the mass concentration of particulates at the platform were higher than others when traffic is heavy. The results of source apportionment showed that more than seven types of sources were detected from each sample. At the platform, 70 percent or more of particles contained Fe as major component, and some of particles were estimated to originated from roadway. At the ground level near the entrance of subway stations, most of particles were estimated to arise from roadway. Particles of Ba5O4 were also detected in samples at the platform and the intermediate site, but not detected in the samples from ground level near the entrance. We can conclude that source apportionment of particulates collected from urban artificial space by this method is effective and practically useful, with a small sample amount.