Thermal and Hygroscopic Properties of Indoor Particulate Matter Collected on an Underground Subway Platform

  • Ma, Chang-Jin (Department of Environmental Science, Fukuoka Women's University) ;
  • Lee, Kyoung-Bin (School of Environmental Engineering, University of Seoul) ;
  • Zhang, Daizhou (Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto) ;
  • Yamamoto, Mariko (Department of Environmental Science, Fukuoka Women's University) ;
  • Kim, Shin-Do (School of Environmental Engineering, University of Seoul)
  • Received : 2015.06.04
  • Accepted : 2015.08.24
  • Published : 2015.09.30


In order to clarify the thermal and hygroscopic properties of indoor particulate matter (PM) in a semiclosed subway space, which is critically important for understanding of the distinctive particle formation processes as well as the assessment of their health effects, the size-resolved PMs (i.e., $PM_{2.5}$ and $PM_{10-2.5}$) were intensively collected on the platform of Miasageori station on the Seoul Subway Line-4. The elemental concentrations in soluble and insoluble fractions were determined by PIXE from the bulkily pretreated $PM_{2.5}$. The thermal and hygroscopic characteristics of individual particles were investigated via a combination of the unique pretreatment techniques (i.e., the high-temperature rapid thermal process and the water dialysis) and SEM-EDX analysis. Iron and calcium were unequaled in insoluble and soluble $PM_{2.5}$ fractions, respectively, with overwhelming concentration. The SEM-EDX's elemental net-counts for the pre- and post-pyrolyzed PMs newly suggest that magnesium and several elements (i.e., silica, aluminum, and calcium) may be readily involved in the newly generated subway fine PM by a high-temperature thermal processing when trains are breaking and starting. Through the water dialysis technique, it turned out that calcium has meaningful amount of water soluble fraction. Furthermore, the concentrations of the counter-ions associated with the calcium in subway $PM_{10-2.5}$ were theoretically estimated.


Supported by : Minister of Land, Infrastructure and Transport


  1. Abbasi, S., Wahlstrom, J., Olander, L., Larsson, C., Olofsson, U., Sellgren, U. (2011) A study of airborne wear particles generated from organic railway brake pads and brake discs. Wear 273, 93-99.
  2. Chillrud, S.N., Grass, D., Ross, J.M., Coulibaly, D., Slavkovich, V., Epstein, D., Sax, S.N., Pederson, D., Johnson, D., Spengler, J.D., Kinney, P.L., Simpson, H.J., Brandt-Rauf, P. (2004) Elevated airborne exposures to manganese, chromium and iron of teenagers from steel dust and New York City's subway system. Environmental Science Technology 38, 732-738.
  3. Daniels, J.I. (1988) Chemicals and properties of military concern associated with natural and anthropogenic sources. AD UCRL-21008 Vol. 4, Part 1.
  4. De Vreede, J.A.F., Brouwer, D.H., Stevenson, H., Van Hemmen, J.J. (1998). Exposure and risk estimation of pesticides in high-volume spraying. Annals of Occupational Hygiene 42, 151-157.
  5. Garrod, A.N.I., Rimmer, D.A., Robertshaw, L., Jones, T. (1998). Occupational exposure through spraying remedial pesticides. Annals of Occupational Hygiene 42, 159-165.
  6. Heyder, J., Gebhart, J., Rudolf, G., Schiller, C.F., Stahlhofen, W. (1986). Deposition of particles in the human respiratory tract in the size range 0.005-155 mm. Journal of Aerosol Science 17, 811-825.
  7. Karlsson, H.L., Nilsson, L., Moller, L. (2005) Subway particles are more genotoxic than street particles and induce oxidative stress in cultured human lung cells. Chemical Research in Toxicology 18, 19-23.
  8. Kim, C.H., Yoo, D.C., Kwon, Y.M., Han, W.S., Kim, G.S., Park, M.J., Kim, Y.S., Choi, D. (2010) A study on characteristics of atmospheric heavy metals in subway station. Toxicology Research 26, 157-162.
  9. Kim, H.K., Ro, C.U. (2010) Characterization of individual atmospheric aerosols using quantitative energy dispersive-electron probe X-ray microanalysis. Asian Journal of Atmospheric Environment 4, 115-140.
  10. Lebowitz, M.D. (1996) Epidemiological studies of the respiratory effects of air pollution. The European Respiratory Journal 9, 1029-1054.
  11. Lorenzo, R., Kaegi, R., Gehrig, R., Grobety, B. (2006) Particle emissions of a railway line determined by detailed single particle analysis. Atmospheric Environment 40, 7831-7841.
  12. Ma, C.J., Lee, K.B., Kim, S.D., Sera, K. (2015) Chemical properties and source profiles of particulate matter collected on an underground subway platform. Asian Journal of Atmospheric Environment 9, 133-140.
  13. McDonnell, W.F., Nishino-Ishikawa, N., Petersen, F.F., Chen, L.H., Abbey, D.E. (2000) Relationships of mortality with the fine and coarse fractions of long-term ambient SPM concentrations in nonsmokers. Journal of Exposure Analysis and Environmental Epidemiology 10, 427-436.
  14. Mori, T., Inudo, M., Takao, Y., Koga, M., Takemasa, T., Shinohara, R., Arizono, K. (2007) In vitro evaluation of atmospheric particulate matter and sedimentation particles using yeast bioassay system. Environmental Sciences 14, 203-210.
  15. Morrow, P.E. (1992) Dust overloading of the lungs: update and appraisal. Toxicology and Applied Pharmacology 113, 1-12.
  16. Pope, C.A., Deckery, D.W., Spengler, J.D., Raizenne, M.E. (1991) Respiratory health $PM_{10}$ pollution. daily time series analysis. The American Review of Respiratory Disease 144, 668-674.
  17. Seaton, A., Cherrie, J., Dennekamp, M., Donaldson, K., Hurley, J.F., Tran, C.L. (2005) The London underground: dust and hazards to health. Occupational and Environmental Medicine 62, 355-362.
  18. Sera, K., Futatsugawa, S., Matsuda, K. (1999) Quantitative analysis of untreated bio-samples. Nuclear Instruments and Methods in Physics Research B 150, 226-233.
  19. Tudor, A., Radulescu, D., Petre, I. (2003) Thermal effect of the brake shoes friction on the wheel/rail contact. Tribology in Industry 25, 27-32.
  20. World Health Organization (2006) International program on chemical safety, environmental health criteria 5: Nitrates, nitrites, and n-nitroso compounds.
  21. World Health Organization (2010) Impact of chloride: Sulfate mass ratio (CSMR) changes on lead leaching in potable water.
  22. Zhang, D., Iwasaka, Y., Shi, G., Zang, J., Matsuki, A., Trochkine, D. (2003) Mixture state and size of Asian dust particles collected at southwestern Japan in spring 2000. Journal of Geophysical Research 108 (D24), 4760, doi:10.1029/2003JD003869.