Distribution and Behavior of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in Sediments form Matsuyama, Japan.
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概要
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Polychlorinated dibenzo-<I>p</I>-dioxins and dibenzofurans (PCDD/Fs) in sediments (coastal, river, pond) and sediment core from Matsuyama, Japan, were analyzed to evaluate the distribution and historical trend of these compounds. PCDD/Fs concentrations in coastal sediments were relatively higher than river and pond sediments. The PCDD/Fs in atmosphere were mainly originated from combustion process and moved to soil by dry and wet deposition. The PCDD/Fs in soils were then entered into aquatic environment through run off. PCDD/Fs in paddy soil that contaminated from impurities of 2, 4, 6-Trichlorophenyl 4-nitrophenylether (CNP) and Pentachlorophenol (PCP) also flowed out to the sea through the rivers. Then PCDD/ Fs in river and seawater deposited to the bottom sediment.<BR>PCDD/Fs contamination was clearly observed during 1960s-1980s, and ther environmental PCDD/Fs levels have been reduced in recent years.<BR>Accumulation flux and deposition velocity to bottom sediment were calculated based on the data of the Matsuyama. The analytical data show that most of PCDD/Fs in water was bound to particles.
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