Relationship between PM<SUB>2.5</SUB>, water-soluble organic carbon and oxidants in Tokyo during the summer

DOI Web Site 1 Citations 30 References
  • Ueno Hiroyuki
    Tokyo Metropolitan Research Institute for Environmental Protection Graduate School of Creative Science and Engineering, Faculty of Science and Engineering, Waseda University
  • Akiyama Kaoru
    Tokyo Metropolitan Research Institute for Environmental Protection
  • Ishii Koichiro
    Tokyo Metropolitan Research Institute for Environmental Protection
  • Miyoshi Takao
    Tokyo Metropolitan Research Institute for Environmental Protection
  • Yokota1 Hisashi
    Tokyo Metropolitan Research Institute for Environmental Protection
  • Nagoya Toshio
    Graduate School of Creative Science and Engineering, Faculty of Science and Engineering, Waseda University

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Other Title
  • 東京都における夏季のPM<SUB>2.5</SUB>及び水溶性有機炭素とオキシダント濃度との関係
  • 東京都における夏季のPM2.5及び水溶性有機炭素とオキシダント濃度との関係
  • トウキョウト ニ オケル カキ ノ PM2 5 オヨビ スイヨウセイ ユウキ タンソ ト オキシダント ノウド ト ノ カンケイ

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PM2.5 continuous monitors equipped with beta radiation attenuation/light scattering photometry detectors have been operated at four sites in Tokyo. The hourly concentrations of SO42- and water-soluble organic carbon (WSOC) were analyzed using the instruments tape filters. The Measurement of the PM2.5 using low-volume samplers and the chemical analysis including the carbon fraction were also performed at two sites to ensure the values of the continuous monitors and to determine the ratio of the WSOC to organic carbon. The PM2.5 concentrations in the summer tended to increase when the high concentrations of the oxidants in consecutive days were observed. The SO42- and WSOC concentrations were the major components in the PM2.5. The WSOC concentrations were higher at the sites in which the OX concentrations were higher although the differences in the SO42- concentrations between the sites were not very clear. This indicates that the secondary formation of organic particulates occurred in the Tokyo area. The amount of the secondary organic matter may be around ten percent of the PM2.5 mass. The Correlation of K+, which is an indicator of biomass burning, and the WSOC in the summer was not clear, while that in the winter was very clear. This indicates that theWSOC generated in the summer is derived from volatile organic compounds.

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