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首页> 外文期刊>Environmental Science & Technology >Fe and Mn Oxidation States by TEM-EELS in Fine-Particle Emissions from a Fe-Mn Alloy Making Plant
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Fe and Mn Oxidation States by TEM-EELS in Fine-Particle Emissions from a Fe-Mn Alloy Making Plant

机译：TEM-EELS在铁锰合金制造厂细颗粒排放中的铁和锰氧化态

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摘要

Fine particles were sampled both inside the chimneys and in the near-field of an Fe-Mn-alloy manufacturing plant. The transfer from one point to another point in the environment, as well as the bioavailability and toxicity of these two metals, depend above all on their speciation. The oxidation states of iron and manganese in the collected particles were determined by using transmission electron microscopy coupled with electron energy-loss spectroscopy (TEM-EELS). The mineralogical identity of these metal-rich particles was determined by selected area electron diffraction (SAED) coupled with energy-dispersive X-ray spectroscopy (EDX). This study shows that both iron and manganese in metallic particles are prone to oxidation reactions via gas/particle conversion mechanisms, which take place in the flue gases within the smoke stacks. This phenomenon is more pronounced for the smallest Fe-rich particles. However, no further change of oxidation state of the two elements was observed in the near-field of the plant, after emission into the atmosphere (within ＜2000 m of the smoke stacks). The oxidation states of iron and manganese remain mainly between +Ⅱ and +Ⅲ, which is probably due to short residence time of these particles in the pollution plume.
机译：在烟囱内部和Fe-Mn合金制造厂的近场中都采样了细颗粒。从环境中的一个点到另一个点的转移以及这两种金属的生物利用度和毒性首先取决于它们的形态。通过使用透射电子显微镜和电子能量损失谱仪（TEM-EELS）来确定收集的颗粒中铁和锰的氧化态。这些富金属颗粒的矿物学特征是通过选择区域电子衍射（SAED）结合能量色散X射线光谱（EDX）来确定的。这项研究表明，金属颗粒中的铁和锰都容易通过气体/颗粒转化机制发生氧化反应，这种反应发生在烟囱内的烟道气中。对于最小的富铁颗粒，这种现象更为明显。但是，在排放到大气中（烟囱＜2000 m以内）后，在工厂的近场中未观察到这两种元素的氧化态进一步变化。铁和锰的氧化态主要保持在+Ⅱ和+Ⅲ之间，这可能是由于这些颗粒在污染羽流中的停留时间短所致。

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  • 来源
    《Environmental Science & Technology》 |2013年第19期|10832-10840|共9页
  • 作者

    Helene Marris; Karine Deboudt; Pascal Flament; Bernard Grobety; Reto Giere;

  • 作者单位

    Universite du Littoral Cote d'Opale, Laboratoire de Physico-Chimie de l'Atmosphere (LPCA), Bailment MREI2, 189A avenue Maurice Schumann, 59140 Dunkerque, France;

    Universite du Littoral Cote d'Opale, Laboratoire de Physico-Chimie de l'Atmosphere (LPCA), Bailment MREI2, 189A avenue Maurice Schumann, 59140 Dunkerque, France;

    Universite du Littoral Cote d'Opale, Laboratoire de Physico-Chimie de l'Atmosphere (LPCA), Bailment MREI2, 189A avenue Maurice Schumann, 59140 Dunkerque, France;

    Department of Geosciences, University of Fribourg, Ch. du Musee 6, CH-1700 Fribourg, Switzerland;

    Institut fuer Geo- und Umweltnaturwissenschaften, Albert-Ludwigs-Universitat, Albertrasse 23b, D-79104 Freiburg, 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);
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