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首页> 外文期刊>Environmental Science & Technology >Binding of Hg' to High-Affinity Sites on Bacteria Inhibits Reduction to Hg° by Mixed Fe Phases
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Binding of Hg' to High-Affinity Sites on Bacteria Inhibits Reduction to Hg° by Mixed Fe Phases

机译：Hg“结合到细菌上的高亲和力位点抑制混合Fe相还原为Hg°

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Magnetite and green rust hare been shown to reduce aqueous Hg" to Hg°. In this study, we tested the ability of magnetite and green rust to reduce Hg" sorbed to 2 g-IT1 of biomass (Bacillus subtilis), at high (50μM) and low (S fM) Hg loadings and at pH 6.5 and S.0. At high Hg:biomass loading, where Hg" binding to biomass is predominantly through carboryi functional groups, Hg Lm-edge X-ray absorption spectroscopy showed reduction of Hg" to Hg° by magnetite. Reduction occurred within 2 h and 2 d at pH 6.5 and 5.0, respectively. At low Hg:biomass loading, where Hg" binds to biomass via sulfhydryl functional groups, Hg" was not reduced by magnetite at pH 6.5 or 5.0 after 2 months of reaction. Green rust, which is generally a stronger reductant than magnetite, reduced about 20% of the total Hg" bound to biomass via sulfhydryl groups to Hg° in 2 d These results suggest that He" binding to carboxyl groups does not significantly inhibit the reduction of Hg by magnetite. However, the binding of Hg to biomass via sulfhydryl groups severely inhibits the ability of mixed Fe" phases like magnetite and green rust to reduce Hg to Hg°. The mobility of heavy metal contaminants in aquatic and terrestrial environments is greatly influenced by their speciation, especially their oxidation state. In the case of Hg, reduction of Hg" to Hg° can increase Hg mobility because of the volatility of Hg°. Since Hg is typically present in aquatic and terrestrial systems at low concentrations, binding of Hg to high-affinity sites on bacteria could have important implications for the potential reduction of Hg" to Hg° and the overall mobility of Hg in biostimulated subsurface environments.
机译：磁铁矿和生铁锈可将Hg“减少到Hg°。在这项研究中，我们测试了磁铁矿和生铁锈将吸附在2 g-IT1生物量（枯草芽孢杆菌）上的Hg”减少的能力）和低（S fM）的Hg含量以及在pH 6.5和S.0下在高Hg：生物质负荷下，Hg“与生物质的结合主要是通过碳硼烷基官能团进行的，Hg Lm边缘X射线吸收光谱显示磁铁矿将Hg”还原为Hg°。在pH 6.5和5.0下分别在2 h和2 d内还原。在低的Hg：生物量负载下，其中Hg“通过巯基官能团结合到生物质上，反应2个月后，pH 6.5或5.0的磁铁矿不会还原Hg”。绿锈通常是比磁铁矿更强的还原剂，在2 d内通过硫氢基将结合到生物质的总Hg“减少约20％至Hg°。这些结果表明，He”与羧基的结合不会显着抑制Hg“的还原。汞被磁铁矿吸收。但是，汞通过硫氢基团与生物质的结合会严重抑制磁铁矿和生铁锈等混合Fe“相将汞还原为Hg°的能力。重金属污染物在水生和陆地环境中的迁移率受其形态的影响很大，在Hg的情况下，由于Hg°的挥发性，将Hg“还原为Hg°可以增加Hg的迁移率。由于汞通常以低浓度存在于水生和陆地系统中，因此汞与细菌上高亲和力位点的结合可能对汞在生物刺激的地下环境中的潜在减少量以及汞的整体迁移率具有重要意义。

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  • 来源
    《Environmental Science & Technology》 |2011年第22期|p.9597-9603|共7页
  • 作者

    Bhoopesh Mishra; Edward J. OLoughlin; Maxim I. Boyanov; Kenneth M. Kemner;

  • 作者单位

    Biosaences Division, Argonne National Laboratory, Argonne, Illinois 60439, United States;

    Biosaences Division, Argonne National Laboratory, Argonne, Illinois 60439, United States;

    Biosaences Division, Argonne National Laboratory, Argonne, Illinois 60439, United States;

    Biosaences Division, Argonne National Laboratory, Argonne, Illinois 60439, United States;

  • 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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