Concentrations, accumulations, and inventories of polychlorinated dibenzo-p-dioxins and dibenzofurans in sediments of the Great Lakes
Concentrations, accumulations, and inventories of polychlorinated dibenzo-p-dioxins and dibenzofurans in sediments of the Great Lakes
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五大湖沉积物中多氯二苯并-对-二恶英和二苯并呋喃的浓度、积累和库存
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发表时间：
1997
期刊：
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通讯作者：
D. T. Long
中科院分区：
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作者：
R. F. Pearson;D. Swackhamer;S. Eisenreich;D. T. Long
多氯二苯并对二恶英/多氯二苯并呋喃积累的时间表是在密歇根州的上级湖和安大略湖以及两个小的“控制”湖泊的沉积物芯中确定的。积累率在1940年左右开始增加，在1970 ± 10年时增加到最大值，然后下降到目前的最大值的30 - 70%。观测到的累积量从目前多氯二苯并对二恶英/多氯二苯并呋喃输入量的90%来自分区域大气（由于当地来源，空气中多氯二苯并对二恶英/多氯二苯并呋喃的浓度高于偏远地区的空气）和/或非大气来源。我们还比较了沉积物积累的大气沉积的估计。对照湖泊中PCDD/F的累积速率与对照湖泊相似。
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 t...