水田土壌における残留性有機汚染物質(POPs)の長期的消長 : 秋田県米代川流域を例として Long-term Fate of Persistent Organic Pollutants in Paddy Soil along the Yoneshiro River Basin in Japan

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The concentrations of persistent organic pollutants (POPs) in paddy soil samples collected in 1982 and 1984 (1980s) and in 2000 and 2002 (2000s) from the Yoneshiro River basin, Japan, were measured to elucidate the temporal trend and mass balance of POPs in paddy soils. Aldrin, dieldrin, endrin, chlordanes and heptachlors were rarely detected in almost all the samples collected in the 1980s and 2000s, whereas DDTs, HCHs, HCB and PCBs were detected in relatively many samples. The concentrations of these compounds were lower than the PCDD/DF concentrations reported in our previous study regardless of sampling year. The concentrations of <I>p,p'</I>-DDD, α-HCH, β-HCH,δ-HCH and lower-chlorinated PCBs (M<SUB>1</SUB>CB, D<SUB>2</SUB>CB, T<SUB>3</SUB>CB and T<SUB>4</SUB>CB) decreased significantly (paired <I>t</I>-test, <I>p</I><0.05) from the 1980s to 2000s, whereas those of the other compounds such as higher-chlorinated PCBs did not decrease. The half-lives of the compounds were calculated as follows: <I>p,p'</I>-DDD, 5.2 years; α-HCH, 5.6 years; β-HCH, 5.0 years; δ-HCH, 4.0 years; M<SUB>1</SUB>CB, 4.5 years; D<SUB>2</SUB>CB, 5.8 years; T<SUB>3</SUB>CB, 5.5 years; and T<SUB>4</SUB>CB, 8.5 years. The half-lives of these compounds correlated with their water solubility. We estimated the total input and remaining amounts of DDTs and HCHs in the paddy fields to determine their long-term fate in the basin within the period of 1962∼2002. Result of the estimation, revealed that approximately 97 % of the DDTs and HCHs applied to the basin were disappeared from the paddy soil by the 1980s.

収録刊行物

  • 環境化学 : journal of environmental chemistry

    環境化学 : journal of environmental chemistry 18(1), 81-93, 2008-03-18

    Japan Society for Environmental Chemistry

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各種コード

  • NII論文ID(NAID)
    10021084876
  • 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
    9433577
  • 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  CJP引用  NDL  J-STAGE 
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