東京湾のダイオキシン汚染 : 組成と汚染源推定  [in Japanese] Sources apportioning of dioxin pollution recorded in Tokyo Bay sediment core based on congener composition  [in Japanese]

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Author(s)

    • 益永 茂樹 MASUNAGA Shigeki
    • 横浜国立大学大学院環境情報研究室 Graduate School of Environment and Information Science, Yokohama National University
    • 姚 元 YAO Yuan
    • 横浜国立大学大学院環境情報研究室|科学技術振興事業団戦略的基礎研究推進事業 Graduate School of Environment and Information Science, Yokohama National University|CREST, Japan Science and Technology Corporation
    • 中西 準子 NAKANISHI Junko
    • 横浜国立大学大学院環境情報研究室|産業技術総合研究所化学物質リスク管理研究センター Graduate School of Environment and Information Science, Yokohama National University|Research Center for Chemical Risk Management, National Institute of Advanced Industrial Science and Technology

Abstract

On the basis of the congener-specific analysis of dioxins in a dated sediment core, surface sediment, and soil samples, the sources and mass balance of dioxins in Tokyo Bay basin, Japan, were estimated. The dioxins in the sediment core showed that their deposition in the bay increased rapidly during the 1960s, peaked in the early 1970s and then decreased gradually. Principal component analysis of the congener-specific data showed that three major sources existed: combustion, pentachlorophenol (PCP), and chloronitrophen (CNP). PCP and CNP are paddy field herbicides used extensively in Japan in the past. The time trends of source contributions were estimated by multiple regression analysis using the source congener profiles. The results revealed that dioxin emission from PCP and CNP herbicides was high in the 1960s and the early 1970s, respectively. The total contribution in terms of TEQ from the two herbicides was at their maximum of 70% in the 1970s and decreased thereafter. Their contribution, however, was as high as 50% in recent sediment, indicating that dioxins sprayed as herbicide impurity were still remaining in terrestrial soil and river sediment of the basin and running off gradually.

Journal

  • Chikyukagaku

    Chikyukagaku 35(4), 159-168, 2001

    The Geochemical Society of Japan

References:  31

Cited by:  5

Codes

  • NII Article ID (NAID)
    110008680026
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0386-4073
  • NDL Article ID
    6015487
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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