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Characterization of soils from an industrial complex contaminated with elemental mercury

机译：来自元素汞污染的工业园区的土壤的表征

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摘要

Historical use of liquid elemental mercury (Hg(0)_1) at the Y-12 National Security Complex in Oak Ridge, TN, USA, resulted in large deposits of Hg(0), in the soils. The fate and distribution of the spilled Hg(0) are not well characterized. In this study we evaluated analytical tools for characterizing the speciation of Hg in the contaminated soils and then used the analytical techniques to examine the speciation of Hg in two soil cores collected at the site. These include x-ray fluorescence (XRF), soil Hg(0) headspace analysis, and total Hg determination by acid digestion coupled with cold vapor atomic absorption (HgT). XRF was not found to be suitable for evaluating Hg concentrations in heterogeneous soils containing low concentration of Hg or Hg(0) because Hg concentrations determined using this method were lower than those determined by HgT analysis and the XRF detection limit is 20 mg/kg. Hg(0)_g headspace analysis coupled with HgT measurements yielded good results for examining the presence of Hg(0)_1 in soils and the speciation of Hg. The two soil cores are highly heterogeneous in both the depth and extent of Hg contamination, with Hg concentrations ranging from 0.05 to 8400 mg/kg. In the first core, Hg(0)_1 was distributed throughout the 3.2 m depth, whereas the second core, from a location 12 m away, contained Hg(0)_1 in a 0.3 m zone only. Sequential extractions showed organically associated Hg dominant at depths with low Hg concentration. Soil from the zone of groundwater saturation showed reducing conditions and the Hg is likely present as Hg-sulfide species. At this depth, lateral Hg transport in the groundwater may be a source of Hg detected in the soil at the deeper soil depths. Overall, characterization of soils containing Hg(0)_1 is difficult because of the heterogeneous distribution of Hg within the soils. This is exacerbated in industrial facilities where fill materials make up much of the soils and historical and continued reworking of the subsurface has remobilized the Hg.
机译：在美国田纳西州奥克里奇的Y-12国家安全中心，液态元素汞（Hg（0）_1）的历史使用导致土壤中Hg（0）的大量沉积。溢出的Hg（0）的命运和分布没有很好的特征。在这项研究中，我们评估了用于表征受污染土壤中汞形态的分析工具，然后使用分析技术检查了在该地点收集的两个土壤核心中汞的形态。其中包括X射线荧光（XRF），土壤Hg（0）顶空分析以及通过酸消化和冷蒸气原子吸收（HgT）进行的总Hg测定。发现XRF不适用于评估Hg或Hg（0）含量低的异质土壤中的Hg浓度，因为使用此方法测定的Hg浓度低于通过HgT分析测定的Hg浓度，且XRF的检出限为20 mg / kg。 Hg（0）_g顶空分析与HgT测量相结合，对于检查土壤中Hg（0）_1的存在和Hg的形态分析产生了良好的结果。这两个土壤核心在汞污染的深度和程度方面高度异质，汞浓度范围为0.05至8400 mg / kg。在第一个岩心中，Hg（0）_1分布在整个3.2 m深度，而在第二个岩心中，距12 m的位置仅在0.3 m区域中包含Hg（0）_1。连续抽提表明，在低汞浓度的深度，有机汞伴有优势。来自地下水饱和区的土壤显示出还原条件，并且汞很可能以硫化汞的形式存在。在此深度处，地下水中的横向汞迁移可能是在更深的土壤深度处土壤中检测到的汞来源。总体而言，由于Hg（0）_1在土壤中的分布不均匀，因此很难表征Hg（0）_1。在工业设施中，这种情况更加严重，在工业设施中，填充材料占了土壤的大部分，地下的历史悠久和持续的修复使汞得以迁移。

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  • 来源
    《Environmental research》 |2013年第8期|20-29|共10页
  • 作者

    Carrie L. Miller; David B. Watson; Brian P. Lester; Kenneth A. Lowe; Eric M. Pierce; Liyuan Liang;

  • 作者单位

    Environmental Sciences Division, Oak Ridge National Laboratory, PO Box 2008, MS 6038, Oak Ridge, TN 37831, USA;

    Environmental Sciences Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831, USA;

    Environmental Sciences Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831, USA;

    Environmental Sciences Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831, USA;

    Environmental Sciences Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831, USA;

    Environmental Sciences Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831, USA;

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

    Analytical methods; Elemental mercury; Industrial contamination; Soil;

    机译：分析方法;元素汞;工业污染;泥;

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