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首页> 外文期刊>Environmental Science & Technology: ES&T >Concentrations, accumulations, and inventories of polychlorinated dibenzo-p-dioxins and dibenzofurans in sediments of the Great Lakes
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Concentrations, accumulations, and inventories of polychlorinated dibenzo-p-dioxins and dibenzofurans in sediments of the Great Lakes

机译：Concentrations, accumulations, and inventories of polychlorinated dibenzo-p-dioxins and dibenzofurans in sediments of the Great Lakes

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The chronology of PCDD/F accumulation was determined in sediment cores from Lakes Superior, Michigan, and Ontario and two small ''control'' lakes. Accumulation rates began increasing about 1940, increased to maxima at 1970 +/- 10 yr, and then declined to the present rates that are 30-70 of the maxima. The observed accumulations ranged from 90 of their current PCDD/F inputs from subregional atmospheric (air parcels having higher concentrations of PCDD/F than remote air due to local sources) and/or non-atmospheric sources. We also compared the sedimentary accumulations to estimates of atmospheric deposition. The PCDD/F accumulation rates in the control lakes were similar to atmospheric deposition of PCDD/Fs from remote air in the Great Lakes basin. Atmospheric deposition from suburban air can support the accumulation of PCDD/F in southern Lake Michigan but some non-atmospheric sources to northern Lake Michigan are implicated. Lake Ontario may be receiving >70 of its current inputs of PCDD/F from non-atmospheric sources.

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