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首页> 外文期刊>Environmental Science & Technology >Mercury Isotope Fractionation in the Subsurface of a Hg(Ⅱ) Chloride-Contaminated Industrial Legacy Site
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Mercury Isotope Fractionation in the Subsurface of a Hg(Ⅱ) Chloride-Contaminated Industrial Legacy Site

机译：水银同位素分馏在Hg（Ⅱ）氯化物污染的工业遗产遗产

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摘要

To understand the transformations of mercury (Hg) species in the subsurface of a HgCl2-contaminated former industrial site in southwest Germany, Hg isotope analysis was combined with an investigation of Hg forms by a four-step sequential extraction protocol (SEP) and pyrolytic thermodesorption. Data from two soil cores revealed that the initial HgCl2 was partly reduced to metallic Hg(0) and that Hg forms of different mobility and oxidation state coexist in the subsurface. The most contaminated sample (K2-8, 802 mg kg(-1) Hg) had a bulk delta Hg-202 value of around -0.43 +/- 0.06 parts per thousand (2SD), similar to published average values for industrial Hg sources. Other sample signatures varied significantly with depth and between SEP pools. The most Hg-rich samples contained mixtures of Hg(0) and Hg(II) phases, and the water-extractable, mobile Hg pool exhibited heavy delta Hg-202 values of up to +0.18 parts per thousand. Sequential water extracts revealed slow dissolution kinetics of mobile Hg pools, continuously releasing isotopically heavy Hg into solution. This was further corroborated by heavy delta Hg-202 values of groundwater samples. Our results demonstrate that the Hg isotope signature of an industrial contamination source can be significantly altered during the transformations of Hg species in the subsurface, which complicates source tracing applications but offers the possibility of using Hg isotopes as process tracers in contaminated subsurface systems.
机译：为了了解德国西南部地区的HGCL2污染的前工业部位地下的汞（HG）物种的转化，HG同位素分析通过四步序列提取方案（SEP）和热解热液和热解热的研究。来自两种土壤核心的数据显示，初始HGCl2部分地减少到金属Hg（0）和地下不同迁移率和氧化状态共存的HG形式。最污染的样品（K2-8，802mg kg（-1）Hg）的批量δhg-202值约为-0.43 +/- 0.06份（2SD），类似于工业HG源的公布平均值。其他示例签名随深度和SEP池之间的深度而变化。富含Hg（0）和Hg（II）阶段的混合物的最富含Hg的样品，以及可降水的移动HG池表现出高达+ 0.18份每千份的重δHg-202值。顺序水提取物揭示了移动HG池的缓慢溶解动力学，连续释放出同位素重的Hg。通过地下水样品的重δHG-202值进一步证实了这一点。我们的结果表明，在地下HG物种的转化期间，可以显着改变产业污染源的Hg同位素特征，其使源跟踪应用程序复杂化，但提供了使用Hg同位素作为受污染的地下系统的过程示踪剂的可能性。

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  • 来源
    《Environmental Science & Technology》 |2019年第13期|7296-7305|共10页
  • 作者

    Brocza Flora M.; Biester Harald; Richard Jan-Helge; Kraemer Stephan M.; Wiederhold Jan G.;

  • 作者单位

    Univ Vienna Ctr Microbiol & Environm Syst Sci Environm Geosci Althanstr 14 UZA 2 A-1090 Vienna Austria|Univ Leeds Sch Chem & Proc Engn 211 Clarendon Rd Leeds LS2 9JT W Yorkshire England;

    Tech Univ Carolo Wilhelmina Braunschweig Inst Geookol Langer Kamp 19C D-38106 Braunschweig Germany;

    Tech Univ Carolo Wilhelmina Braunschweig Inst Geookol Langer Kamp 19C D-38106 Braunschweig Germany|Inst Hyg & Environm Marckmannstr 129A D-20539 Hamburg Germany;

    Univ Vienna Ctr Microbiol & Environm Syst Sci Environm Geosci Althanstr 14 UZA 2 A-1090 Vienna Austria;

    Univ Vienna Ctr Microbiol & Environm Syst Sci Environm Geosci Althanstr 14 UZA 2 A-1090 Vienna Austria;

  • 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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