Polychlorinated biphenyls in dated sediments of Milwaukee Harbour, Wisconsin, USA

Environmental Pollution Series B, Chemical and Physical Pub Date : 1986-01-01 DOI:10.1016/0143-148X(86)90011-X

E.R. Christensen, C.-K. Lo

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引用次数: 14

Abstract

A sediment core from Milwaukee Harbour was dated by the Pb-210 and Cs-137 methods and analysed for polychlorinated biphenyls (PCBs). The mass sedimentation rate of 1·10 g cm⁻² year⁻¹ was significantly higher than for Lake Michigan. The Cs-137 inventory of 162·9 dpm cm⁻² was 11·7 times higher than that calculated from atmospheric deposition data. There was a significant degree of PCB pollution in the sediments, as evidenced by the fact that the PCB flux was 596 times higher than the average atmospheric input to Lake Michigan. The vertical distribution of PCBs in the relatively undisturbed core followed the available national sales records (1957–1974) remarkably well. In addition, there was a sharp drop in layers from the late 1970s which would be expected in view of the recent curtailment of PCB usage and production. Relatively high levels of Aroclor 1254 point to local electrical component manufacturers. Several users of hydraulic fluids and lubricants containing PCBs have probably also contributed to the increased levels in the harbour sediments.

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美国威斯康辛州密尔沃基港年代沉积物中的多氯联苯

通过Pb-210和Cs-137方法测定了密尔沃基港沉积物岩心的年代，并分析了多氯联苯(PCBs)。质量沉降速率为1·10 g cm−2年−1，显著高于密歇根湖。162·9 dpm cm−2的Cs-137存量是大气沉降数据的11.7倍。沉积物中存在明显的多氯联苯污染，多氯联苯通量是密歇根湖平均大气输入量的596倍。多氯联苯在相对未受干扰的岩心中的垂直分布与现有的全国销售记录(1957-1974)非常吻合。此外，由于最近PCB的使用和生产的减少，从1970年代后期开始，层数急剧下降。相对较高水平的Aroclor 1254指向本地电气元件制造商。一些使用含有多氯联苯的液压油和润滑剂的用户可能也是导致港口沉积物中多氯联苯含量增加的原因之一。

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