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ID 14205
file
title alternative
Distribution of dioxins in atmospheric deposition, soils, and bottom sediments of rivers and coastal sea in Hiroshima prefecture, Japan
creator
山下 俊幸
宮地 和夫
subject
dioxins
Hiroshima prefecture
atmospheric deposition
soil
bottom sediment
Hiroshima Bay
Ohta River
NDC
Pollution. Environmental engineering
abstract
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.
journal title
Memoirs of the Faculty of Integrated Arts and Sciences, Hiroshima University. IV, Science reports
volume
Volume 31
start page
73
end page
89
date of issued
2005-12
publisher
広島大学総合科学部
contributor
国立情報学研究所
issn
1340-8364
ncid
SelfDOI
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
text version
publisher
department
Graduate School of Integrated Arts and Sciences
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