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首页> 外文期刊>Environmental Science & Technology >Electron Energy-Loss Safe-Dose Limits for Manganese Valence Measurements in Environmentally Relevant Manganese Oxides
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Electron Energy-Loss Safe-Dose Limits for Manganese Valence Measurements in Environmentally Relevant Manganese Oxides

机译：与环境有关的锰氧化物中锰价的电子能量损失安全剂量限值

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摘要

Manganese (Mn) oxides are among the strongest mineral oxidants in the environment and impose significant influence on mobility and bioavailability of redox-active substances, such as arsenic, chromium, and pharmaceutical products, through oxidation processes. Oxidizing potentials of Mn oxides are determined by Mn valence states (2+, 3+, 4+). In this study, the effects of beam damage during electron energy-loss spectroscopy (EELS) in the transmission electron microscope have been investigated to determine the "safe dose" of electrons. Time series analyses determined the safe dose fluence (electronsm~2) for todorokite (10~6 em~2), acid birnessite (10~5), triclinic bimessite (10~4), randomly stacked birnessite (10~3), and δ-MnO_2 (<10~3) at 200 kV. The results show that meaningful estimates of the mean Mn valence can be acquired by EELS if proper care is taken.
机译：锰（Mn）氧化物是环境中最强的矿物氧化剂之一，并且通过氧化过程对氧化还原活性物质（如砷，铬和药品）的迁移率和生物利用度产生重大影响。 Mn氧化物的氧化电位由Mn价态（2+，3+，4+）确定。在这项研究中，已经研究了透射电子显微镜中电子能量损失谱（EELS）期间电子束损伤的影响，以确定电子的“安全剂量”。时间序列分析确定了白云母（10〜6 e / nm〜2），酸水钠锰矿（10〜5），三斜斜二水母（10〜4），无规叠水钠锰矿（10〜 3）和δ-MnO_2（<10〜3）在200 kV下。结果表明，如果采取适当的措施，EELS可以获取有意义的平均Mn价估计。

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  • 来源
    《Environmental Science & Technology》 |2012年第2期|p.970-976|共7页
  • 作者

    Kenneth J. T. Livi; Brandon Lafferty; Mengqiang Zhu; Shouliang Zhang; Anne-Claire Galliot; Donald L. Sparks;

  • 作者单位

    The High-Resolution Analytical Electron Microbeam Facility of the Integrated Imaging Center Departments of Earth and Planetary Sciences and Biology, Johns Hopkins University, Baltimore, Maryland 21218, United States;

    Plant and Soil Sciences, University of Delaware, Newark, Delaware 19717-1303, United States,U.S. Army Engineer Research & Development Center, 3909 Halls Ferry Road, Vicksburg, Mississippi 39180, United States;

    The High-Resolution Analytical Electron Microbeam Facility of the Integrated Imaging Center Departments of Earth and Planetary Sciences and Biology, Johns Hopkins University, Baltimore, Maryland 21218, United States;

    Texas Material Institute, University of Texas, Austin, Texas 78712, United States;

    Institut des Materiaux Jean Rouxel (IMN), Universite de Nantes, CNRS, 2 rue de la Houssiniere, BP 32229, 44322 Nantes Cedex 3, France;

    Plant and Soil Sciences, University of Delaware, Newark, Delaware 19717-1303, 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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