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首页> 外文期刊>Environmental Science & Technology >Mercury Isotope Signatures as Tracers for Hg Cycling at the New Idria Hg Mine
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Mercury Isotope Signatures as Tracers for Hg Cycling at the New Idria Hg Mine

机译：汞同位素作为新爱德里亚汞矿中汞循环的示踪剂。

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摘要

Mass-dependent fractionation (MDF) and mass-independent fractionation (MIF) of Hg isotopes provides a new tool for tracing Hg in contaminated environments such as mining sites, which represent major point sources of Hg pollution into surrounding ecosystems. Here, we present Hg isotope ratios of unroasted ore waste, calcine (roasted ore), and poplar leaves collected at a closed Hg mine (New Idria, CA, U.S.A.). Unroasted ore waste was isotopically uniform with δ~(202)Hg values from -0.09 to 0.16‰ (±0.10‰, 2 SD), close to the estimated initial composition of the HgS ore (-0.26‰). In contrast, calcine samples exhibited variable δ~(202)Hg values ranging from -1.91‰ to +2.10‰. Small MIF signatures in the calcine were consistent with nuclear volume fractionation of Hg isotopes during or after the roasting process. The poplar leaves exhibited negative MDF (-3.18 to -1.22‰) and small positive MIF values (Δ~(199)Hg of 0.02 to 0.21‰). Sequential extractions combined with Hg isotope analysis revealed higher δ~(202)Hg values for the more soluble Hg pools in calcines compared with residual HgS phases. Our data provide novel insights into possible in situ transformations of Hg phases and suggest that isotopically heavy secondary Hg phases were formed in the calcine, which will influence the isotope composition of Hg leached from the site.
机译：汞同位素的质量依赖性分级分离（MDF）和质量非依赖性分级分离（MIF）提供了一种在受污染的环境（例如采矿场）中追踪汞的新工具，这些环境代表了汞污染到周围生态系统的主要来源。在这里，我们介绍了在封闭的汞矿（美国加利福尼亚州新Idria）收集的未焙烧矿石废料，煅烧（焙烧矿石）和白杨叶的汞同位素比。未经焙烧的矿石废物的同位素分布均匀，δ〜（202）Hg值为-0.09至0.16‰（±0.10‰，2 SD），接近HgS矿石的估计初始组成（-0.26‰）。相比之下，煅烧样品的δ〜（202）Hg值变化范围为-1.91‰至+ 2.10‰。焙烧过程中或之后，煅烧炉中的小MIF签名与Hg同位素的核体积分级一致。杨树叶片显示出负的MDF（-3.18至-1.22‰）和较小的正MIF值（Δ〜（199）Hg为0.02至0.21‰）。顺序萃取与汞同位素分析相结合，与残留的HgS相相比，煅烧炉中更易溶的Hg池具有更高的δ〜（202）Hg值。我们的数据提供了有关汞相可能发生的原位转变的新颖见解，并表明在煅烧炉中形成了同位素重的次级汞相，这将影响从该地点浸出的汞的同位素组成。

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  • 来源
    《Environmental Science & Technology》 |2013年第12期|6137-6145|共9页
  • 作者

    Jan G. Wiederhold; Robin S. Smith; Hagar Siebner; Adam D. Jew; Gordon E. Brown Jr.; Bernard Bourdon; Ruben Kretzschmar;

  • 作者单位

    Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Switzerland,Isotope Geochemistry Group, Institute of Geochemistry and Petrology, ETH Zurich, Switzerland;

    Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Switzerland,Isotope Geochemistry Group, Institute of Geochemistry and Petrology, ETH Zurich, Switzerland;

    Department of Geological and Environmental Sciences, Stanford University, Stanford, California, United States;

    Department of Geological and Environmental Sciences, Stanford University, Stanford, California, United States;

    Department of Geological and Environmental Sciences, Stanford University, Stanford, California, United States;

    Isotope Geochemistry Group, Institute of Geochemistry and Petrology, ETH Zurich, Switzerland,Laboratoire de Geologie de Lyon, ENS Lyon, CNRS and UCBL, Lyon, France;

    Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Switzerland;

  • 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);
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