愛媛県における大気エアロゾル中多環芳香族炭化水素類(PAHs)の濃度レベル, 変動の特徴とその起源 Characteristics and Sources of Polycyclic Aromatic Hydrocarbons in Ehime Prefecture

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Concentrations of particulate polycyclic aromatic hydrocarbons(PAHs) in ambient air were investigated every month during the period Apr. 2004 to Mar. 2006 at two sampling sites in Ehime Prefecture; Site-N in Niihama city industrial area and Site-U in Uwajima city nonindustrial area. The sampling was carried out by high volume air sampler on quarts filters, extracted with dichloromethane and analyzed by HPLC with programmable fluorescence detection. Heavy metals and water soluble ios in particulate samples and benzene in air samples were also analyzed in this study. Annual average of total PAHs concentrations ranged from 4.5 to 4.7 ng/m<SUP>3</SUP> at Site-N, higher than in Site-U (2.0∼3.4 ng/m<SUP>3</SUP>). Estimated risks of each PAHs based on unit risk were in the order of 10<SUP>-7</SUP>∼10<SUP>-5</SUP>, but overall risk was higher than objective criteria suggested by Central Environmental Council, Japan. B[a]P contributed above 50 % followed by DB[a,h]A. To have a complete knowledge on PAHs in atmosphere, their levels in the gaseous phase should also be monitored. Major source of PAHs would be vehicles especially diesel cars because of their diagnostic ratios of B[ghi]P/IP, IP/(IP+B[ghi]P) and (B[b]F+B[k]F)/B[ghi]P ranged within values reported for diesel exhausts so far. This view can be substantiated by the observed high correlation of PAHs with benzene and carbon oxide. Indexes of sources were selected by hierarchical cluster analysis on datasets of PAHs, metals and ions at Site-U which has no significant sources from industries. Then temporal variations of them and back trajectories at points in time were analyzed. It appears that high concentrations of anthropogenic metals and NH<SUB>4</SUB>SO<SUB>4</SUB> are observed when the air mass was originated and passed through low-altitudes on industrial regions of China. Although PAHs showed significant correlation with these metals, they would be increased mainly by the effect of atmospheric stability.

収録刊行物

  • 環境化学 : journal of environmental chemistry

    環境化学 : journal of environmental chemistry 18(1), 29-42, 2008-03-18

    一般社団法人 日本環境化学会

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各種コード

  • NII論文ID(NAID)
    10021084753
  • NII書誌ID(NCID)
    AN10547099
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09172408
  • NDL 記事登録ID
    9433488
  • NDL 雑誌分類
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学) // ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z16-2322
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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