...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Arsenic(Ⅴ) Incorporation in Vivianite during Microbial Reduction of Arsenic(Ⅴ)-Bearing Biogenic Fe(Ⅲ) (Oxyhydr)oxides
【24h】

Arsenic(Ⅴ) Incorporation in Vivianite during Microbial Reduction of Arsenic(Ⅴ)-Bearing Biogenic Fe(Ⅲ) (Oxyhydr)oxides

机译：含砷（Ⅴ）的生物源性Fe（Ⅲ）（羟基）氧化物的微生物还原过程中砷（Ⅴ）掺入Vivianite中

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The dissolution of arsenic-bearing iron(Ⅲ) (oxyhydr)oxides during combined microbial iron(Ⅲ) and arsenate(Ⅴ) reduction is thought to be the main mechanism responsible for arsenic mobilization in reducing environments. Besides its mobilization during bioreduction, arsenic is often resequestered by newly forming secondary iron(Ⅱ)-bearing mineral phases. In phosphate-bearing environments, iron(Ⅱ) inputs generally lead to vivianite precipitation. In fact, in a previous study we observed that during bioreduction of arsenate(Ⅴ)-bearing biogenic iron(Ⅲ) (oxyhydr)oxides in phosphate-containing growth media, arsenate(Ⅴ) was immobilized by the newly forming secondary iron(Ⅱ) and iron(Ⅱ)/iron(Ⅲ)mineral phases, including vivianite. In the present study, changes in arsenic redox state and binding environment in these experiments were analyzed. We found that arsenate(Ⅴ) partly replaced phosphate in vivianite, thus forming a vivianite-symplesite solid solution identified as Fe_3(PO_4)_(1.7)(AsO_4)_(0.3)·8H_2O. Our data suggests that in order to predict the fate of arsenic during the bioreduction of abiogenic and biogenic iron(Ⅲ) (oxyhydr)oxides in arsenic-contaminated environments, the formation of symplesite-vivianite minerals needs to be considered. Indeed, such mineral phases could contribute to a delayed and slow release of arsenic in phosphate-bearing surface and groundwater environments.
机译：人们认为，在微生物还原铁和还原砷的过程中，含砷铁氧化物的溶解是造成还原环境中砷动员的主要机理。除生物还原过程中的动员外，砷还经常与新形成的含铁（Ⅱ）的次生矿物相重聚。在含磷酸盐的环境中，铁（Ⅱ）的输入通常会导致堇青石沉淀。实际上，在先前的研究中，我们观察到在含磷酸盐的生长培养基中对含砷酸根（Ⅴ）的生铁（Ⅲ）（羟基）氧化物的生物还原过程中，砷酸（Ⅴ）被新形成的次级铁（Ⅱ）固定化了。铁（Ⅱ）/铁（Ⅲ）矿相，包括堇青石。在本研究中，分析了这些实验中砷氧化还原状态和结合环境的变化。我们发现，砷酸盐（Ⅴ）部分取代了堇青石中的磷酸盐，从而形成了确定为Fe_3（PO_4）_（1.7）（AsO_4）_（0.3）·8H_2O的堇青石-对称的固溶体。我们的数据表明，为了预测砷污染环境中生源性和生源性氧化铁（Ⅲ）（羟基）氧化物的生物还原过程中砷的命运，需要考虑形成人造辉石矿物。的确，此类矿物质相可能会导致含磷地表和地下水环境中砷的延迟和缓慢释放。

著录项

  • 来源
    《Environmental Science & Technology》 |2016年第5期|2281-2291|共11页
  • 作者

    E. Marie Muehe; Guillaume Morin; Lukas Scheer; Pierre Le Pape; Imene Esteve; Birgit Daus; Andreas Kappler;

  • 作者单位

    Geomicrobiology, Center for Applied Geosciences, University of Tuebingen, Tuebingen, Germany,Environmental Soil Biogeochemistry, Earth System Science, Stanford University, Stanford, California 94305, United States;

    Environmental Mineralogy, Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie (IMPMC), UMR7590 - CNRS -UPMC, 75252, Paris cedex 05, France;

    Geomicrobiology, Center for Applied Geosciences, University of Tuebingen, Tuebingen, Germany;

    Environmental Mineralogy, Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie (IMPMC), UMR7590 - CNRS -UPMC, 75252, Paris cedex 05, France;

    Environmental Mineralogy, Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie (IMPMC), UMR7590 - CNRS -UPMC, 75252, Paris cedex 05, France;

    UFZ - Helmholtz Centre for Environmental Research, Department Analytical Chemistry, Leipzig, Germany;

    Geomicrobiology, Center for Applied Geosciences, University of Tuebingen, Tuebingen, Germany;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号