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首页> 外文期刊>Environmental Science & Technology >Antimonite Binding to Natural Organic Matter: Spectroscopic Evidence from a Mine Water Impacted Peatland
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Antimonite Binding to Natural Organic Matter: Spectroscopic Evidence from a Mine Water Impacted Peatland

机译：锑与天然有机物的结合：矿井水影响泥炭地的光谱证据

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摘要

Peatlands and other wetlands are sinks for antimony (Sb), and solid natural organic matter (NOM) may play an important role in controlling Sb binding. However, direct evidence of Sb sequestration in natural peat samples is lacking. Here, we analyzed solid phase Sb, iron (Fe), and sulfur (5) as well as aqueous Sb speciation in three profiles up to a depth of 80 cm in a mine water impacted peatland in northern Finland. Linear combination fittings of extended X-ray absorption fine structure spectra showed that Sb binding to Fe phases was of minor importance and observed only in the uppermost layers of the peatland. Instead, the dominant (to almost exclusive) sequestration mechanism was Sb(III) binding to oxygen-containing functional groups, and at greater depths, increasingly Sb(III) binding to thiol groups of NOM. Aqueous Sb speciation was dominated by antimonate, while antimonite concentrations were low, further supporting our findings of much higher reactivity of Sb(III) than Sb(V) toward peat surfaces. Insufficient residence time for efficient reduction of antimonate to antimonite currently hinders higher Sb removal in the studied peatland. Overall, our findings imply that Sb(III) binding to solid NOM acts as an important sequestration mechanism under reducing conditions in peatlands and other high-organic matter environments.
机译：泥炭地和其他湿地是锑（Sb）的汇源，固体天然有机物（NOM）可能在控制Sb结合中起重要作用。然而，缺乏天然泥炭样品中Sb螯合的直接证据。在这里，我们分析了芬兰北部矿井水污染泥炭地中深达80 cm的三个剖面中的固相Sb，铁（Fe）和硫（5）以及含水Sb形态。扩展的X射线吸收精细结构光谱的线性组合拟合显示，Sb与Fe相的结合重要性不高，仅在泥炭地的最上层观察到。相反，主要的（几乎是排他的）螯合机制是Sb（III）与含氧官能团的结合，并且在更大的深度上，Sb（III）与NOM硫醇基的结合越来越多。 Sb的形态以锑酸盐为主，而锑酸盐的浓度较低，这进一步支持了我们的发现，Sb（III）对泥炭表面的反应性比Sb（V）高得多。有效地将锑酸盐还原为锑酸盐的停留时间不足目前阻碍了研究泥炭地中更高的锑去除率。总体而言，我们的发现暗示在泥炭地和其他高有机质环境中，Sb（III）与固体NOM的结合在减少条件下起着重要的螯合机制的作用。

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  • 来源
    《Environmental Science & Technology》 |2019年第18期|10792-10802|共11页
  • 作者

    Besold Johannes; Eberle Anne; Noel Vincent; Kujala Katharina; Kumar Naresh; Scheinost Andreas C.; Pacheco Juan Lezama; Fendorf Scott; Planer-Friedrich Britta;

  • 作者单位

    Bayreuth Univ Bayreuth Ctr Ecol & Environm Res BAYCEER Dept Environm Geochem D-95440 Bayreuth Germany;

    SLAC Natl Accelerator Lab Stanford Synchrotron Radiat Lightsource Menlo Pk CA 94025 USA;

    Univ Oulu Water Resources & Environm Engn Res Unit FI-90014 Oulu Finland;

    Stanford Univ Sch Earth Energy & Environm Sci Dept Geol Sci Stanford CA 94305 USA|Univ Vienna Ctr Microbiol & Environm Syst Sci Dept Environm Geosci A-1090 Vienna Austria;

    ESRF Rossendorf Beamline ROBL F-38043 Grenoble France|HZDR Inst Resource Ecol Bautzner Landstr 400 F-01328 Dresden France;

    Stanford Univ Sch Earth Energy & Environm Sci Dept Earth Syst Sci Stanford CA 94305 USA;

  • 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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