Chemical speciation of size-segregated floor dusts and airborne magnetic particles collected at underground subway stations in Seoul, Korea

Jung, Hosang; Kim, BoWha; Malek, Abdul; Koo, Y. S.; Jung, Jong Hoon; Son, Youn-Suk; Kim, Jo-Chun; Kim, Hye‐Kyoung; Ro, Chul-Un

doi:10.1016/j.jhazmat.2012.02.006

Cited by 82 publications

(65 citation statements)

References 36 publications

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“…Results of previous studies reported that the majority of particulate matter generated in tunnels consisted of Fe-containing particles with magnetic properties (Eom et al, 2013;Jung et al, 2012;. Jung et al (2012) reported that the fraction of magnetic particles in the floor dust of subway systems accounted for 98-100% of particles <25 mm in size (Jung et al, 2012).…”

Section: Suggestions On Pm Control In Tunnelsmentioning

confidence: 99%

“…Jung et al (2012) reported that the fraction of magnetic particles in the floor dust of subway systems accounted for 98-100% of particles <25 mm in size (Jung et al, 2012). They also reported that iron particles (2.5-10 mm in size) made up 77.3-86.9% of tunnel dust samples (Jung et al, 2012). Moreover, the nonmagnetic hematite comprised significant portions (30%) of tunnel samples.…”

Section: Suggestions On Pm Control In Tunnelsmentioning

confidence: 99%

“…Platform screen doors (PSDs) have been installed between the platform and the tunnel in Seoul subway stations to maintain the safety of passengers and to distinctly improve indoor air quality Sohn et al, 2008;Jung et al, 2012). Installing PSDs can prevent injury and loss of human life caused by subway trains passing through the stations.…”

Section: Introductionmentioning

confidence: 99%

“…Epidemiological studies have reported adverse respiratory and cardiovascular health effects associated with PM mass concentrations (Dominici et al, 2006;Gent et al, 2003). Particularly, the composition of PM emitted from tunnels includes mainly iron compounds such as magnetite (Fe 3 O 4 ), hematite (Fe 2 O 3 ), and Fe metal (Jung et al, 2012;Mugica-Álvarez et al, 2012;Salma et al, 2007). With regard to the toxicity of those specific compounds, Karlsson et al (2005) reported that the subway particles were approximately eight times more genotoxic and four times more likely to cause oxidative stress in lung cells.…”

Section: Introductionmentioning

confidence: 99%

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Installation of platform screen doors and their impact on indoor air quality: Seoul subway trains

Son¹,

Jeon²,

Lee³

et al. 2014

Journal of the Air & Waste Management Association

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In this study, variations of particulate matter (PM) concentrations in subway trains following installation of platform screen doors (PSDs) in the Seoul subway system were investigated. PM samples were collected in the trains on subway lines 1-8 before and after installation of PSDs. It was found that the mean PM 10 concentration in the trains after PSDs installation increased significantly by 29.9% compared to that before installation. In particular, the increase of PM 10 in line 6 was the highest at 103%. When the relationship between PM 10 and PM 2.5 was compared, coefficients of determination (r 2 ) before and after PSDs installations were 0.696 and 0.169, respectively. This suggests that air mixing between the platform and the tunnel after PSDs installation was extremely restricted. In addition, the indoor/outdoor PM 10 ratio following PSDs installation increased from 1.32 to 2.97 relative to the period with no installed PSDs. Furthermore, this study revealed that PM levels in subway trains increased significantly after all underground PSDs were put in use. Several potential factors were examined that could result in this PM increase, such as train ventilation systems, operational conditions, passenger volume, subway depth, and the length of underground segments.Implications: PM 10 concentrations inside the subway trains increased after PSDs installation. This indicates that air quality in trains was very seriously impacted by PSDs. PM 10 levels were also influenced by the tunnel depth and length of the underground segments. To prevent the adverse effect on human health by PM 10 emitted from the tunnel, an applicable ventilation system to reduce PM 10 is required inside trains and tunnels.

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Section: Suggestions On Pm Control In Tunnelsmentioning

confidence: 99%

Section: Suggestions On Pm Control In Tunnelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Installation of platform screen doors and their impact on indoor air quality: Seoul subway trains

Son¹,

Jeon²,

Lee³

et al. 2014

Journal of the Air & Waste Management Association

Self Cite

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show abstract

“…For example, in Seoul, the capital city of the Republic of Korea, there are 13 subway lines currently in operation and about 7.5 million people use them every day. Due to friction between train wheels and rails, as well as between brake disks and shoes, PM 10 consisting of metallic particles (Fe being a major component, but also Cr, Mn, Cu, and Zn) are generated in underground tunnels (Kang et al, 2008;Raut et al, 2009;Salma et al, 2009;Jung et al, 2010Jung et al, , 2012. The generated PM 10 has a great influence on air quality inside the subway train (Cheng et al, 2012), and spreads to the platform due to the wind created when trains pass (Park et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Performance Estimation of a Louver Dust Collector Attached to the Bottom of a Subway Train Running in a Tunnel

Sim

Yoon²,

Woo

et al. 2017

Aerosol Air Qual. Res.

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In underground tunnels, friction between the wheels and rails of subway trains creates particles, which are spread by the wind generated when trains pass by. A louver dust collector was attached to the bottom of a T-car of Seoul Subway Line 5 train in an effort to remove PM 10 inside tunnels, and obtain data when it was in actual operation. It made several round trips during which differential pressure of the louver dust collector was measured in relation to train speed. By comparing and verifying the differential pressure estimated by simulation and that actually measured, it was possible to estimate average flow of air that went into the louver dust collector. Furthermore, by comparing and verifying the measurement results on collection efficiency of a lab-scale louver dust collector in a wind tunnel, along with the results of numerical analysis, it was possible to estimate the collection efficiency in relation to subway train speed. As a result, it was confirmed that higher running speeds of subway trains increased the flow of air going into the louver dust collector and subsequently decreased the particle size corresponding to 50% collection efficiency. In other words, the cut-off size was estimated to be 9.7 µm at the lowest speed of 5 km h -1 , and 4.9 µm at the top speed of 65 km h -1 , in normal speed range for the Seoul Subway Line 5 trains.

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Status of PM in Seoul metropolitan subway cabins and effectiveness of subway cabin air purifier (SCAP)

Kim

Lee

et al. 2013

Clean Techn Environ Policy

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Chemical speciation of size-segregated floor dusts and airborne magnetic particles collected at underground subway stations in Seoul, Korea

Cited by 82 publications

References 36 publications

Installation of platform screen doors and their impact on indoor air quality: Seoul subway trains

Installation of platform screen doors and their impact on indoor air quality: Seoul subway trains

Performance Estimation of a Louver Dust Collector Attached to the Bottom of a Subway Train Running in a Tunnel

Status of PM in Seoul metropolitan subway cabins and effectiveness of subway cabin air purifier (SCAP)

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