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Sources and Characteristics of Particulate Matter in Subway Tunnels in Seoul, Korea

Author

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  • Yongil Lee

    (Korea Railroad Research Institute (KRRI), 176 Cheoldobakmulkwan-ro, Uiwang-si 16105, Korea
    Mechanical Engineering, Sungkyunkwan University, 2066 Seobu-ro, Suwon-si 16419, Korea)

  • Young-Chul Lee

    (Department of BioNano Technology, Gachon University, 1342 seongnamdae-ro, Seongnam-si 13120, Korea)

  • Taesung Kim

    (Mechanical Engineering, Sungkyunkwan University, 2066 Seobu-ro, Suwon-si 16419, Korea)

  • Jin Seok Choi

    (Analysis Center for Research Advancement, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon-si 34141, Korea)

  • Duckshin Park

    (Korea Railroad Research Institute (KRRI), 176 Cheoldobakmulkwan-ro, Uiwang-si 16105, Korea)

Abstract

Hazards related to particulate matter (PM) in subway systems necessitate improvement of the air quality. As a first step toward establishing a management strategy, we assessed the physicochemical characteristics of PM in a subway system in Seoul, South Korea. The mean mass of PM 10 and PM 2.5 concentrations ( n = 13) were 213.7 ± 50.4 and 78.4 ± 8.8 µg/m 3 , with 86.0% and 85.9% of mass concentration. Chemical analysis using a thermal–optical elemental/organic carbon (EC–OC) analyzer, ion chromatography (IC), and inductively coupled plasma (ICP) spectroscopy indicated that the chemical components in the subway tunnel comprised 86.0% and 85.9% mass concentration of PM 10 and PM 2.5 . Fe was the most abundant element in subway tunnels, accounting for higher proportions of PM, and was detected in PM with diameters >94 nm. Fe was present mostly as iron oxides, which were emitted from the wheel–rail–brake and pantograph–catenary wire interfaces. Copper particles were 96–150 nm in diameter and were likely emitted via catenary wire arc discharges. Furthermore, X-ray diffraction analysis (XRD) showed that the PM in subway tunnels was composed of calcium carbonate (CaCO 3 ), quartz (SiO 2 ), and iron oxides (hematite ( α -Fe 2 O 3 ) and maghemite-C ( γ -Fe 2 O 3 )). Transmission electron microscopy images revealed that the PM in subway tunnels existed as agglomerates of iron oxide particle clusters a few nanometers in diameter, which were presumably generated at the aforementioned interfaces and subsequently attached onto other PM, enabling the growth of aggregates. Our results can help inform the management of PM sources from subway operation.

Suggested Citation

  • Yongil Lee & Young-Chul Lee & Taesung Kim & Jin Seok Choi & Duckshin Park, 2018. "Sources and Characteristics of Particulate Matter in Subway Tunnels in Seoul, Korea," IJERPH, MDPI, vol. 15(11), pages 1-17, November.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:11:p:2534-:d:182256
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    References listed on IDEAS

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    1. Sinha, Avik & Bhattacharya, Joysankar, 2016. "Environmental Kuznets curve estimation for NO2 emission: A case of Indian cities," MPRA Paper 100179, University Library of Munich, Germany, revised 2016.
    2. He, Guojun & Fan, Maoyong & Zhou, Maigeng, 2016. "The effect of air pollution on mortality in China: Evidence from the 2008 Beijing Olympic Games," Journal of Environmental Economics and Management, Elsevier, vol. 79(C), pages 18-39.
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    Cited by:

    1. Jun Ho Jo & ByungWan Jo & Jung Hoon Kim & Ian Choi, 2020. "Implementation of IoT-Based Air Quality Monitoring System for Investigating Particulate Matter (PM 10 ) in Subway Tunnels," IJERPH, MDPI, vol. 17(15), pages 1-12, July.
    2. Yueming Wen & Jiawei Leng & Xiaobing Shen & Gang Han & Lijun Sun & Fei Yu, 2020. "Environmental and Health Effects of Ventilation in Subway Stations: A Literature Review," IJERPH, MDPI, vol. 17(3), pages 1-37, February.

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