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首页> 外文期刊>Environmental Science & Technology >Electrokinetic Remediation of Mercury-Contaminated Soils Using Iodine/Iodide Lixiviant
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Electrokinetic Remediation of Mercury-Contaminated Soils Using Iodine/Iodide Lixiviant

机译：用碘/碘化物利希维亚特电动修复汞污染的土壤

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摘要

In-situ remediation of mercury-contaminated soils, by electrokinetic or other means, is difficult because of the low solubility of mercury and its compounds. In this research, enhanced electrokinetic remediation of HgS-contaminated soils using I_2/I~- lixiviant was investigated using bench-scale electrokinetic cells. The thermodynamic conditions under which the lixiviant could be effective were determined by constructing a pE-pH diagram for the Hg-S-I system. Introduced near the cathode, the lixiviant migrated through the soil to the anode by electromigration. Mercury, released by the oxidation of HgS compounds by I_2, was complexed as HgI_4~(2-). The negative complex continued to electromigrate toward the anode. Up to 99% of the Hg present in laboratory-contaminated soils could be removed. Electrokinetic treatment of a field-contaminated soil, containing more organic matter than the laboratory-contaminated soil, occurred much slower. The critical issues in determining the efficacy of the process are the oxidation of reduced Hg by I_2 and I_3~- and the transport of the resultant HgI_4~(2-) complex.
机译：由于电动势及其化合物的低溶解度，很难通过电动或其他手段对汞污染的土壤进行原位修复。在这项研究中，使用台式规模的电动细胞，研究了使用I_2 / I〜-浸滤剂增强HgS污染土壤的电动修复。通过构建Hg-S-I系统的pE-pH图，可以确定浸滤剂有效的热力学条件。浸滤剂在阴极附近引入，通过电迁移通过土壤迁移到阳极。通过I_2氧化HgS化合物释放的汞络合为HgI_4〜（2-）。负配合物继续向阳极电迁移。存在于实验室污染土壤中的汞最多可以去除99％。对现场污染的土壤（其中有机物含量比实验室污染的土壤更多）的电动处理发生的速度要慢得多。确定该方法的有效性的关键问题是还原的Hg被I_2和I_3〜-氧化以及所得HgI_4〜（2-）配合物的转运。

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  • 来源
    《Environmental Science & Technology》 |1996年第6期|p.1933-1938|共6页
  • 作者

    CHRIS D. COX; MATTHEW A. SHOESMITH; MRIGANKA M. GHOSH;

  • 作者单位

    Department of Civil and Environmental Engineering, Center for Environmental Biotechnology, 223 Perkins Hall, University of Tennessee, Knoxville, Tennessee 37996-2010;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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