...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Effects of Manganese Oxide on Arsenic Reduction and Leaching from Contaminated Floodplain Soil
【24h】

Effects of Manganese Oxide on Arsenic Reduction and Leaching from Contaminated Floodplain Soil

机译：氧化锰对洪泛区土壤砷还原和淋溶的影响

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

Reductive release of the potentially toxic metalloid As from Fe(III) (oxyhydr)oxides has been identified as an important process leading to elevated As porewater concentrations in soils and sediments. Despite the ubiquitous presence of Mn oxides in soils and their oxidizing power toward As(III), their impact on interrelated As, Fe, and Mn speciation under microbially reducing conditions remains largely unknown. For this reason, we employed a column setup and X-ray absorption spectroscopy to investigate the influence of increasing birnessite concentrations (molar soil Fe-to-Mn ratios: 4.8, 10.2, and 24.7) on As speciation and release from an As-contaminated floodplain soil (214 mg As/kg) under anoxic conditions. Our results show that birnessite additions significantly decreased As leaching. The reduction of both As and Fe was delayed, and As(III) accumulated in bimessite-rich column parts, indicating the passivation of birnessite and its transformation products toward As(III) oxidation and the precipitation of Fe(III)(oxyhydr)oxides. Microbial Mn reduction resulted in elevated soil pH values, which in turn lowered the microbial activity in the bimessite-enriched soil. We conclude that in Mn-oxide-rich soil environments undergoing redox fluctuations, the enhanced As adsorption to newly formed Fe(III) (oxyhydr)oxides under reducing conditions leads to a transient stabilization of As.
机译：从Fe（III）（羟基）氧化物中还原有毒的准金属As被认为是导致土壤和沉积物中As孔隙水浓度升高的重要过程。尽管土壤中普遍存在Mn氧化物及其对As（III）的氧化能力，但在微生物还原条件下，它们对相关的As，Fe和Mn形态的影响仍然未知。因此，我们采用了色谱柱设置和X射线吸收光谱技术，研究了增加的水钠锰矿浓度（土壤中铁锰比（摩尔比）：4.8、10.2和24.7）对砷形态和从砷污染中释放的影响。缺氧条件下的洪泛区土壤（214 mg As / kg）。我们的结果表明，水钠锰矿的添加显着降低了As的浸出。 As和Fe的还原都被延迟了，As（III）富集在Bimessite的柱部分中，表明水钠锰矿及其转化产物对As（III）氧化的钝化和Fe（III）（羟基）氧化物的沉淀。 。微生物Mn的降低导致土壤pH值升高，进而降低了富生物的土壤的微生物活性。我们得出结论，在经历氧化还原波动的富锰氧化物土壤环境中，在还原条件下增强的As对新形成的Fe（III）（羟基）氧化物的吸附会导致As的瞬时稳定。

著录项

  • 来源
    《Environmental Science & Technology》 |2016年第17期|9251-9261|共11页
  • 作者

    Katrin Ehlert; Christian Mikutta; Ruben Kretzschmar;

  • 作者单位

    Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, CHN, ETH Zurich, 8092 Zurich, Switzerland;

    Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, CHN, ETH Zurich, 8092 Zurich, Switzerland,Section for Environmental Chemistry and Physics, Department of Plant and Environmental Sciences, University of Copenhagen, DK-1871 Frederiksberg C, Denmark;

    Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, CHN, ETH Zurich, 8092 Zurich, Switzerland;

  • 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