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首页> 外文期刊>Environmental Science & Technology >Speciation of Arsenic, Chromium, and Vanadium in Red Mud Samples from the Ajka Spill Site, Hungary
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Speciation of Arsenic, Chromium, and Vanadium in Red Mud Samples from the Ajka Spill Site, Hungary

机译：匈牙利Ajka泄漏场的红色泥样中砷，铬和钒的形态

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摘要

Results are presented from X-ray absorption spectroscopy based analysis of As, Cr, and V speciation within samples of bauxite ore processing residue (red mud) collected from the spill site at Ajka, Western Hungary. Cr K-edge XANES analysis found that Cr is present as Cr~(3+) substituted into hematite, consistent with TEM analysis. V K-edge XANES spectra have E_(1/2) position and pre-edge features consistent with the presence of V~(5+) species, possibly associated with Ca-aluminosilicate phases. As K-edge XANES spectra identified As present as As~(5+). EXAFS analysis reveals arsenate phases in red mud samples. When alkaline leachate from the spill site is neutralized with HC1, 94% As and 71% V are removed from solution during the formation of amorphous Al-oxyhydroxide. EXAFS analysis of As in this precipitate reveals the presence of arsenate Al-oxyhydroxide surface complexes. These results suggest that in the circumneutral pH, oxic conditions found in the Toma and Upper Marcal catchments, incorporation and sorption, respectively, will restrict the environmental mobility of Cr and As. V is inefficiently removed from solution by neutralization, therefore, the red mud may act as a source of mobile V~(5+) where the red mud deposits are not removed from affected land.
机译：结果是通过X射线吸收光谱法得出的，该结果基于从匈牙利西部Ajka泄漏场收集的铝土矿加工残渣（红泥）样品中的As，Cr和V形态分析。 Cr K-edge XANES分析发现Cr以Cr〜（3+）取代赤铁矿存在，与TEM分析一致。 V K边缘XANES光谱具有E_（1/2）位置和前边缘特征，与V〜（5+）物种的存在相一致，可能与Ca-铝硅酸盐相有关。作为K边缘XANES光谱鉴定为As〜（5+）。 EXAFS分析揭示了赤泥样品中的砷相。当泄漏点的碱性渗滤液用HCl中和时，在形成无定形氢氧化铝时会从溶液中去除94％的As和71％的V。对该沉淀物中As的EXAFS分析表明，存在砷酸铝羟基氧化物表面复合物。这些结果表明，在环境pH值下，托马和上马卡尔集水区的有氧条件，结合和吸附分别限制了Cr和As的环境迁移。 V通过中和不能有效地从溶液中去除，因此，赤泥可以作为流动V〜（5+）的来源，在该处，未从受影响的土地上去除赤泥沉积物。

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  • 来源
    《Environmental Science & Technology》 |2012年第6期|p.3085-3092|共8页
  • 作者

    Ian T. Burke; William M. Mayes; Caroline L. Peacock; Andrew P. Brown; Adam P. Jarvis; Katalin Gruiz;

  • 作者单位

    Earth Surface Science Institute, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, U.K.;

    Centre for Environmental and Marine Sciences, University of Hull, Scarborough, YO11 3AZ, U.K.;

    Earth Surface Science Institute, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, U.K.;

    School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, U.K.;

    School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, U.K.;

    Department of Applied Biotechnology and Food Science, Budapest University of Technology and Economics, 1111 Budapest, St. Gellert sq. 4, Hungary;

  • 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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