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首页> 外文期刊>Environmental Science & Technology >Tellurium Distribution and Speciation in Contaminated Soils from Abandoned Mine Tailings: Comparison with Selenium
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Tellurium Distribution and Speciation in Contaminated Soils from Abandoned Mine Tailings: Comparison with Selenium

机译：废弃矿山尾矿中土壤中碲的分布和形态：与硒的比较

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摘要

The distribution and chemical species of tellurium (Te) in contaminated soil were determined by a combination of microfocused X-ray fluorescence (µ-XRF), X-ray diffraction (µ-XRD), and X-ray absorption fine structure (µ-XAFS) techniques. Results showed that Te was present as a mixture of Te(VI) and Te(IV) species, while selenium (Se) was predominantly present in the form of Se(IV) in the soil contaminated by abandoned mine tailings. In the contaminated soil, Fe(Ⅲ) hydroxides were the host phases for Se(IV), Te(IV), and Te(VI), but Te(IV) could be also retained by illite. The difference in speciation and solubility of Se and Te in soil can result from different structures of surface complexes for Se and Te onto Fe(Ⅲ) hydroxides. Furthermore, our results suggest that the retention of Te(IV) in soil could be relatively weaker than that of Te(VI) due to structural incorporation of Te(VI) into Fe(Ⅲ) hydroxides. These findings are of geochemical and environmental significance for better understanding the solubility, mobility, and bioavailability of Te in the surface environment. To the best of our knowledge, this is the first study reporting the speciation and host phases of Te in field soil by the μ-XRF-XRD-XAFS techniques.
机译：碲（Te）在受污染土壤中的分布和化学物种是通过微聚焦X射线荧光（µ-XRF），X射线衍射（µ-XRD）和X射线吸收精细结构（µ- XAFS）技术。结果表明，Te以Te（VI）和Te（IV）的混合物形式存在，而硒（Se）主要以Se（IV）的形式存在于被废弃矿山尾矿污染的土壤中。在受污染的土壤中，Fe（Ⅲ）的氢氧化物是Se（IV），Te（IV）和Te（VI）的宿主相，但是伊利石也可以保留Te（IV）。 Se和Te在Fe（Ⅲ）氢氧化物上的表面配合物的结构不同，可能导致Se和Te在土壤中的形态和溶解度不同。此外，我们的结果表明，由于Te（VI）在Fe（Ⅲ）氢氧化物中的结构结合，Te（IV）在土壤中的保留能力可能比Te（VI）相对弱。这些发现对于更好地了解Te在表面环境中的溶解度，迁移率和生物利用度具有地球化学和环境意义。据我们所知，这是第一项通过μ-XRF-XRD-XAFS技术报告田间土壤中Te的形态和寄主相的研究。

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  • 来源
    《Environmental Science & Technology》 |2017年第11期|6027-6035|共9页
  • 作者

    Hai-Bo Qin; Yasuo Takeichi; Hiroaki Nitani; Yasuko Terada; Yoshio Takahashi;

  • 作者单位

    State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China,Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan;

    Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan;

    Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan;

    Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan;

    Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan;

  • 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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