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首页> 外文期刊>Environmental Science & Technology >Updated Polychlorinated Biphenyl Mass Budget for Lake Michigan
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Updated Polychlorinated Biphenyl Mass Budget for Lake Michigan

机译：密歇根湖更新的多氯联苯总体预算

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摘要

This study revisits and updates the Lake Michigan Mass Balance Project (LMMBP) for polychlorinated biphenyls (PCBs) that was conducted in 1994—1995. This work uses recent concentrations of PCBs in tributary and open lake water, air, and sediment to calculate an updated mass budget. Five of the 11 LMMBP tributaries were revisited in 2015. In these five tributaries, the geometric mean concentrations of ∑PCBs (sum of 85 congeners) ranged from 1.52 to 22.4 ng L~(-1). The highest concentrations of PCBs were generally found in the Lower Fox River and in the Indiana Harbor and Ship Canal. The input flows of ∑PCBs from wet deposition, dry deposition, tributary loading, and auto water exchange, and the output flows due to sediment burial, volatilization from water to air, and transport to Lake Huron and through the Chicago Diversion were calculated, as well as flows related to the internal processes of settling, resuspension, and sediment—water diffusion. The net transfer of ∑PCBs is 1240 ± 531 kg yr~(-1) out of the lake. This net transfer is 46% lower than that estimated in 1994—1995. PCB concentrations in most matrices in the lake are decreasing, which drove the decline of all the individual input and output flows. Atmospheric deposition has become negligible, while volatilization from the water surface is still a major route of loss, releasing PCBs from the lake into the air. Large masses of PCBs remain in the water column and surface sediments and are likely to contribute to the future efflux of PCBs from the lake to the air.
机译：这项研究回顾并更新了1994-1995年进行的密歇根湖质量平衡项目（LMMBP）中的多氯联苯（PCBs）。这项工作利用支流和开阔的湖水，空气和沉积物中最近的多氯联苯浓度来计算最新的质量预算。 2015年，对11个LMMBP支流中的5个进行了修订。在这5个支流中，∑PCBs（85个同类物的总和）的几何平均浓度范围为1.52至22.4 ng L〜（-1）。多氯联苯的最高浓度通常在下福克斯河以及印第安纳州港口和船舶运河中发现。计算了湿法沉积，干法沉积，支流负荷和自动水交换所产生的∑PCBs的输入流量，以及由于沉积物埋藏，从水到空气的挥发以及运输到休伦湖和通过芝加哥分流而产生的输出流量，计算如下：以及与沉降，再悬浮和沉积物-水扩散的内部过程有关的流量。 ∑PCBs的净迁移量为1240±531 kg yr〜（-1）。该净转移额比1994-1995年的估计额低46％。湖中大多数基质中的PCB浓度都在下降，这导致所有单独的输入和输出流量下降。大气中的沉积物可以忽略不计，而水面的挥发仍然是主要的损失途径，将多氯联苯从湖泊中释放到空气中。大量的多氯联苯残留在水柱和地表沉积物中，可能会导致多氯联苯从湖泊到空气的未来流出。

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  • 来源
    《Environmental Science & Technology》 |2017年第21期|12455-12465|共11页
  • 作者

    Jiehong Guo; Kevin Romanak; Stephen Westenbroek; An Li; Russell G. Kreis Jr.; Ronald A Hites; Marta Venier;

  • 作者单位

    School of Public and Environmental Affairs, Indiana University, Bloomington, Indiana 47405, United States;

    School of Public and Environmental Affairs, Indiana University, Bloomington, Indiana 47405, United States;

    U.S. Geological Survey, Wisconsin Water Science Center, Middleton, Wisconsin 53562, United States;

    School of Public Health, University of Illinois at Chicago, Chicago, Illinois 60612, United States;

    United States Environmental Protection Agency, Office of Research and Development, Grosse Ile, Michigan 48138, United States;

    School of Public and Environmental Affairs, Indiana University, Bloomington, Indiana 47405, United States;

    School of Public and Environmental Affairs, Indiana University, Bloomington, Indiana 47405, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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