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首页> 外文期刊>Aquatic Sciences >Fixation of manganese and iron in freshwater sediments through electrochemically initiated processes I: Principles and laboratory studies
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Fixation of manganese and iron in freshwater sediments through electrochemically initiated processes I: Principles and laboratory studies

机译：通过电化学引发的过程将锰和铁固定在淡水沉积物中I：原理和实验室研究

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摘要

Most existing in-lake methods used to minimize the remobilization of redox-sensitive compounds from sediments are costly and limited in their effectiveness. Therefore, new approaches for this problem are needed. We describe electrochemically initiated transformation processes of iron and manganese, resulting in their immobilization in the sediment. This process could possibly be applied to prevent remobilization of phosphate from lake sediments. With electrodes positioned 3 cm in the sediment and 7 cm above the sediment-water interface, an electrochemically controlled redox- and pH-barrier was constructed. By means of laboratory experiments in columns filled with sediment and water from a reservoir, we demonstrated the possibility to fix and concentrate Fe and Mn under specific conditions in the sediment, or if required, to mobilize and drain them in concentrated solution. The behaviors of these metals were studied by simultaneous measurements of their concentrations, pH-, E_h-values, and O_2-concentration at the interface and in the water with and without current influence. The results show that soluble species can be transported and concentrated in an electric field. Iron and manganese can be prevented from being released from the sediments by sustainable in-situ fixation.
机译：现有的大多数用于最小化氧化还原敏感化合物从沉积物中迁移的湖内方法成本高昂，而且效果有限。因此，需要针对该问题的新方法。我们描述了铁和锰的电化学引发的转变过程，导致它们固定在沉积物中。此过程可能适用于防止湖泊沉积物中磷酸盐的迁移。将电极放置在沉积物中3 cm处和沉积物-水界面上方7 cm处，构建了电化学控制的氧化还原和pH阻挡层。通过在充满水库中沉积物和水的塔中进行的实验室实验，我们证明了在特定条件下将Fe和Mn固定并浓缩在沉积物中的可能性，或者，如果需要，可以将其迁移并浓缩掉。这些金属的行为通过同时测量它们的浓度，pH值，E_h值以及在有电流影响和无电流影响的情况下在界面和水中的O_2浓度进行了研究。结果表明，可溶性物质可以在电场中迁移和浓缩。通过可持续的原位固定可以防止铁和锰从沉积物中释放出来。

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  • 来源
    《Aquatic Sciences》 |2004年第1期|p. 95-102|共8页
  • 作者

    Roland Fischer; Claudia Wolf; Dietmar Rahner; Lothar Paul; Thomas Deepe; Christian E. W. Steinberg;

  • 作者单位

    Institute of Municipal and Industrial Water Engineering, Dresden University of Technology, MommsenstraBe 13, 01062 Dresden, Germany;

    Institute of Municipal and Industrial Water Engineering, Dresden University of Technology, MommsenstraBe 13, 01062 Dresden, Germany;

    Institute of Physical Chemistry and Electrochemistry, Dresden University of Technology, MommsenstraBe 13, 01062 Dresden, Germany;

    Neunzehnhain Ecological Station, Dresden University of Technology, NeunzehnhainerstraBe 14, 09514 Wunschendorf, Germany;

    Institute of Hydrobiology, Dresden University of Technology, MommsenstraBe 13, 01062 Dresden, Germany;

    Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Muggelseedamm 310, 12587 Berlin, Germany;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 水文科学（水界物理学）;
  • 关键词

    iron; manganese; sediment; electrochemistry; immobilization;

    机译：铁;锰;沉积;电化学;固定化;

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