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首页> 外文期刊>Environmental Science & Technology >Formation of Binary and Ternary Colloids and Dissolved Complexes of Organic Matter, Fe and As
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Formation of Binary and Ternary Colloids and Dissolved Complexes of Organic Matter, Fe and As

机译：二元和三元胶体的形成以及有机物，铁和砷的溶解复合物

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摘要

Natural organic matter can change As speciation via redox reactions and complexation influencing its mobility and toxicity. Here we show that binary and ternary colloids and dissolved complexes of As(V), Fe and organic matter (OM) form at environmentally relevant conditions and analyzed these colloids/ complexes using ATR-FTIR- and Moessbauer-spectroscopy. Dissolved Fe-OM complexes and ferrihydrite-OM colloids were formed by reacting OM with ferrihydrite (Fe(OH)_3). Moessbauer-spectroscopy showed that 95% of the Fe in the Fe-OM fraction were present as ferrihydrite-OM colloids while the remaining 5% were in the dissolved fraction. In As(V) plus Fe-OM systems (containing both dissolved and colloidal Fe-OM), 3.5-8 μg As(V)/mg OC was bound to the Fe-OM complexes/ colloids compared to <0.015 μg As(V)/mg OC in As-OM systems (without Fe). Upon filtration of As-Fe-OM complexes/ colloids with a 3 kDa filter, ～6% As was found in the dissolved fraction and ～94% As in colloidal Fe-OM. This suggests that As(V) is associated with Fe-OM mainly via ferrihydrite-OM colloids but to a small extent also in dissolved Fe-OM complexes via Fe-bridging. Since As-contaminated soils and aquifers contain Fe(III) minerals and OM, colloids of As with OM-loaded ferrihydrite and complexes of As with dissolved Fe-OM have to be considered when studying As transport.
机译：天然有机物可以通过氧化还原反应和络合形式改变形态，从而影响其流动性和毒性。在这里，我们显示了在与环境相关的条件下，As（V），Fe和有机物（OM）形成了二元和三元胶体以及溶解的络合物，并使用ATR-FTIR和Moessbauer光谱分析了这些胶体/络合物。通过使OM与水铁矿（Fe（OH）_3）反应形成溶解的Fe-OM络合物和水铁矿-OM胶体。 Moessbauer光谱显示，Fe-OM级分中95％的铁以水铁矿-OM胶体的形式存在，而其余5％则存在于溶解级分中。在As（V）加上Fe-OM系统（包含溶解的Fe-OM和胶态的Fe-OM）中，与<0.015μgAs（V）相比，3.5-8μgAs（V）/ mg OC与Fe-OM复合物/胶体结合）/ mg As-OM系统中的OC（不含Fe）。用3 kDa滤器过滤As-Fe-OM复合物/胶体后，在溶解级分中发现〜6％的As，在胶体Fe-OM中发现的〜94％As。这表明As（V）主要通过水铁矿-OM胶体与Fe-OM缔合，但在少量情况下也通过Fe桥联在溶解的Fe-OM络合物中。由于被As污染的土壤和含水层含有Fe（III）矿物和OM，因此在研究As运移时，必须考虑As与OM负载的水铁矿的胶体以及As与溶解的Fe-OM的配合物。

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  • 来源
    《Environmental Science & Technology》 |2010年第12期|P.4479-4485|共7页
  • 作者

    PRASESH SHARMA; rnJOHANNES OFNER; ANDREAS KAPPLER;

  • 作者单位

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

    rnAtmospheric Chemistry Research Laboratory, University of Bayreuth, Germany;

    rnGeomicrobiology, Center for Applied Geosciences, University of 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);
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