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首页> 外文期刊>Marine Chemistry >Transport and reactivity of nickel in estuarine sediments: Results from a high capacity flume
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Transport and reactivity of nickel in estuarine sediments: Results from a high capacity flume

机译：镍在河口沉积物中的迁移和反应性：高容量水槽的结果

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摘要

The transport and reactivity of Ni bound to size-fractionated sediment (d_(50) = 130μm) from the Mersey estuary have been examined in a high capacity flume, modified to accommodate a model estuary. A 10 cm layer of size-fractionated sediment was spread on the base of the flume, with the exception of a small plug of size-fractionated sediment that had been spiked with Ni and inserted in the upstream section. The flume was filled with tap water which was continuously circulated for 8 h, during which the water velocities were monitored and water samples were taken and filtered. At the end of the experiment sediment cores were obtained. The samples were analysed for dissolved and particulate Ni. Erosion occurred in the vicinity of the Ni-spiked plug and deposition took place in the expansion zone, where water velocities were lower. The concentrations of suspended particulate Ni had a persistent minimum in the deposition zone because of mixing between spiked and natural particles. In the deposition zone, the sediment cores had distinctive subsurface maxima in Ni concentrations indicating a variable supply of Ni-rich sediment. Partition coefficients, K_Ds, for Ni were relatively constant, ～10~4 L kg~(-1) and were independent of time and location. Flume experiments conducted at a more environmentally-relevant scale provide quantitative mechanistic information for the improvement of coupled hydro-geochemical models used to predict the fate of contaminated sediments in macrotidal estuaries.
机译：在高容量水槽中检查了结合到默西河口大小分级沉积物（d_（50）=130μm）的镍的迁移和反应性，并对其进行了改进以适应模型河口。 10厘米大小的沉淀物层铺展在水槽的底部，除了一小块大小的沉淀物，上面塞了镍，并插入了上游部分。槽中充满了自来水，自来水连续循环8小时，在此期间监控水的速度并采集水样并过滤。在实验结束时，获得了沉积物核。分析样品中的溶解镍和颗粒镍。镍尖塞附近发生了侵蚀，沉积发生在水流速度较低的膨胀区。由于加标颗粒和天然颗粒之间的混合，悬浮颗粒Ni的浓度在沉积区具有持久的最小值。在沉积区，沉积物核在镍浓度下具有独特的地下最大值，表明富镍沉积物的供给量可变。 Ni的分配系数K_Ds相对恒定，约为10〜4 L kg〜（-1），与时间和位置无关。在与环境更相关的规模上进行的水槽实验为定量耦合潮汐-地球化学模型的改进提供了定量的力学信息，该模型用于预测潮汐河口受污染的沉积物的命运。

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  • 来源
    《Marine Chemistry》 |2009年第4期|71-76|共6页
  • 作者

    F. Couceiro; W. Rauen; G.E. Millward; B. Lin; A. Turner; R. Falconer;

  • 作者单位

    Marine Institute, University of Plymouth, Portland Square, Drake Circus, Plymouth, PL4 8AA, UK;

    Cardiff University, Hydro-environmental Research Centre, School of Engineering, Queen's Buildings, The Parade, Cardiff, CF24 3AA, UK;

    Marine Institute, University of Plymouth, Portland Square, Drake Circus, Plymouth, PL4 8AA, UK;

    Cardiff University, Hydro-environmental Research Centre, School of Engineering, Queen's Buildings, The Parade, Cardiff, CF24 3AA, UK;

    Marine Institute, University of Plymouth, Portland Square, Drake Circus, Plymouth, PL4 8AA, UK;

    Cardiff University, Hydro-environmental Research Centre, School of Engineering, Queen's Buildings, The Parade, Cardiff, CF24 3AA, UK;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    contaminated sediments; estuaries; nickel; transport; reactivity; flume experiments;

    机译：受污染的沉积物;河口镍;运输;反应性水槽实验;

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