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首页> 外文期刊>Environmental Science & Technology >Incorporation of Metals into Calcite in a Deep Anoxic Granite Aquifer
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Incorporation of Metals into Calcite in a Deep Anoxic Granite Aquifer

机译：在深层缺氧花岗岩含水层中将金属掺入方解石中

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src="http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2018/esthag.2018.52.issue-2/acs.est.7b05258/20180111/images/medium/es-2017-052583_0005.gif">Understanding metal scavenging by calcite in deep aquifers in granite is of importance for deciphering and modeling hydrochemical fluctuations and water–rock interaction in the upper crust and for retention mechanisms associated with underground repositories for toxic wastes. Metal scavenging into calcite has generally been established in the laboratory or in natural environments that cannot be unreservedly applied to conditions in deep crystalline rocks, an environment of broad interest for nuclear waste repositories. Here, we report a microanalytical study of calcite precipitated over a period of 17 years from anoxic, low-temperature (14 °C), neutral (pH: 7.4–7.7), and brackish (Cl: 1700–7100 mg/L) groundwater flowing in fractures at >400 m depth in granite rock. This enabled assessment of the trace metal uptake by calcite under these deep-seated conditions. Aquatic speciation modeling was carried out to assess influence of metal complexation on the partitioning into calcite. The resulting environment-specific partition coefficients were for several divalent ions in line with values obtained in controlled laboratory experiments, whereas for several other ions they differed substantially. High absolute uptake of rare earth elements and U(IV) suggests that coprecipitation into calcite can be an important sink for these metals and analogousactinides in the vicinity of geological repositories.
机译：src =“ http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2018/esthag.2018.52.issue-2/acs.est.7b05258/20180111/images/medium /es-2017-052583_0005.gif“>了解花岗岩深层含水层中方解石对金属的清除作用，对于解密和模拟上地壳中的水化学波动和水-岩相互作用以及与有毒废物的地下储存库相关的保留机制非常重要。通常已经在实验室或自然环境中建立了向方解石中清除金属的方法，不能无保留地将其应用到深结晶岩的条件中，而深结晶岩是核废料储存库中广泛关注的环境。在这里，我们报告了从缺氧，低温（14°C），中性（pH：7.4–7.7）和微咸（Cl：1700–7100 mg / L）地下水历时17年沉淀的方解石的微观分析研究在花岗岩中深度> 400 m的裂缝中流动。这使得能够评估在这些深层条件下方解石对痕量金属的吸收。进行了水生物种建模，以评估金属络合物对分解为方解石的影响。所得的特定于环境的分配系数是针对几种二价离子的，与在受控实验室实验中获得的值一致，而对于其他几种离子，它们的差别却很大。稀土元素和U（IV）的绝对摄入量高，表明方解石中的共沉淀物可能是这些地质储层附近金属和类似act系元素的重要沉陷。

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  • 来源
    《Environmental Science & Technology》 |2018年第2期|493-502|共10页
  • 作者

    Henrik Drake; Frédéric A. Mathurin; Thomas Zack; Thorsten Schäfer; Nick MW Roberts; Martin Whitehouse; Andreas Karlsson; Curt Broman; Mats E. Åström;

  • 作者单位

    Department of Biology and Environmental Science, Linnaeus University, 39231 Kalmar, Sweden;

    Department of Biology and Environmental Science, Linnaeus University, 39231 Kalmar, Sweden;

    Department of Earth Sciences, University of Gothenburg, 405 30 Gothenburg, Sweden;

    Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal, 76021 Karlsruhe, Germany;

    NERC Isotope Geosciences Laboratory, British Geological Survey, Nottingham NG12 5GG, U.K.;

    Department of Geosciences, Swedish Museum of Natural History, 10405 Stockholm, Sweden;

    Department of Geosciences, Swedish Museum of Natural History, 10405 Stockholm, Sweden;

    Department of Geological Sciences, Stockholm University, Stockholm 106 91, Sweden;

    Department of Biology and Environmental Science, Linnaeus University, 39231 Kalmar, Sweden;

  • 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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