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首页> 外文期刊>Canadian Journal of Fisheries and Aquatic Sciences >Distribution, hydrologic transport, and cycling of total mercury and methyl mercury in a contaminated river-reservoir-wetland system (sudbury river, eastern massachusetts)
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Distribution, hydrologic transport, and cycling of total mercury and methyl mercury in a contaminated river-reservoir-wetland system (sudbury river, eastern massachusetts)

机译：污染的河流-水库-湿地系统（马萨诸塞州东部的萨德伯里河）中总汞和甲基汞的分布，水文运输和循环

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摘要

Riparian wetlands contaminated with Hg from an industrial point source were found to the important sites of production and release of methyl mercury (MeHg) in a 40-km reach of the Sudbury River in eastern Massachusetts. Stream discharge and concentration measurements were used to calculate annual mean loads for total Hg (sumHg) and MeHg in contaminated river reaches. a reservoir, and a riparian wetland downstream from the industrial source. Budgets based on these loads indicate that the annual meansumHg load increased sixfold in a reach receiving flow from the point source, but the annual mean MeHg load did not increase. About 23% of the sumHg load was removed by sedimentation during flow through the reservoir. Net production of MeHg in the reservoir was similar to that reported elsewhere for lakes receiving Hg from atmospheric deposition only. sumHg concentrations and loads increased significantly as the river passed through the riparian wetland reach. On the basis of flooded wetland area, netproduction of MeHg was 15 times greater in the wetland reach than in wetland-associated drainages described in other studies.
机译：在马萨诸塞州东部萨德伯里河40公里处，发现了从工业点源受到汞污染的河岸湿地到甲基汞（MeHg）的生产和释放的重要场所。河流排放和浓度测量用于计算受污染河段的总Hg（sumHg）和MeHg的年平均负荷。一个水库，以及位于工业来源下游的河岸湿地。基于这些负荷的预算表明，在从点源接收流量的范围内，年度平均MgHg负荷增加了六倍，但年度平均MeHg负荷没有增加。在通过储层的过程中，通过沉降去除了总汞负荷的约23％。水库中的甲基汞净产量与其他地方报告的仅从大气沉积中接收汞的湖泊的净产量相似。随着河流通过河岸湿地的到达，总的浓度和负荷显着增加。基于湿地被淹的面积，在湿地覆盖范围内，甲基汞的净产量比其他研究中描述的与湿地相关的排水系统高出15倍。

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