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ID 14205
本文ファイル
別タイトル
Distribution of dioxins in atmospheric deposition, soils, and bottom sediments of rivers and coastal sea in Hiroshima prefecture, Japan
著者
山下 俊幸
宮地 和夫
キーワード
dioxins
Hiroshima prefecture
atmospheric deposition
soil
bottom sediment
Hiroshima Bay
Ohta River
NDC
公害・環境工学
抄録(英)
Distribution of dioxins (PCDDs, PCDFs, and Co-PCBs) in atmospheric deposition, soils, and bottom sediments of rivers and coastal sea were examined in Hiroshima prefecture, Japan during 1998-1999. The monthly concentrations of PCDDs/DFs in atmospheric deposition (rain and dry deposition together) were 1.3-3.3 pg-TEQ/L and the monthly depositions were 4.1-20 pg TEQ/m2/day in Fukuyama during April to September in 1999. PCDDs/DFs concentrationsin soils were 4.9-34,1.2-2.5, 1.1-6700 and 77-86 pg-TEQ/dry g at Mt. Gokurakuji in Hatsukaichi, at a forest in Souryou Town, at industrial incinerators in Fukuyama and at paddy fields in Higashi-Hiroshima, respectively. Very high concentrations found in the soils at the industrial incinerator suggest the contamination of ashes into the soils due to uncontrolled burning in open fire and relatively higher concentrations in the paddy fields indicate the successive utilization of pesticides in the past years. Dioxins in the bottom sediments collected from Ohta River in Hiroshima City were ranged to be 1.4-6.1 pg-TEQ/dry g.PCDDs/DFs concentrations in the Seto Inland Sea bottom sediments were 0.6 to 14 pg-TEQ/dry g and their concentrations were higher in Hiroshima Bay than those at off coast, suggesting that dioxins brought by Ohta River and other rivers are accumulated in the Bay sediments. Maximum concentration of PCDDs/DFs was found in the core sediments deposited in 1970s-1980s, suggesting large production of dioxins by human activities in these decades.
掲載誌名
広島大学総合科学部紀要. IV, 理系編
31巻
開始ページ
73
終了ページ
89
出版年月日
2005-12
出版者
広島大学総合科学部
寄与者
国立情報学研究所
ISSN
1340-8364
NCID
SelfDOI
言語
日本語
NII資源タイプ
紀要論文
広大資料タイプ
学内刊行物(紀要等)
DCMIタイプ
text
著者版フラグ
publisher
部局名
総合科学研究科
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