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首页> 外文期刊>Geoderma: An International Journal of Soil Science >The effect of the ferrihydrite dissolution/transformation process on mobility of arsenic in soils: Investigated by coupling a two-step sequential extraction with the diffusive gradient in the thin films (DGT) technique
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The effect of the ferrihydrite dissolution/transformation process on mobility of arsenic in soils: Investigated by coupling a two-step sequential extraction with the diffusive gradient in the thin films (DGT) technique

机译：Ferrihydrite溶出/转化方法对土壤中砷的迁移率的影响：通过在薄膜（DGT）技术中与扩散梯度偶联的两步顺序提取研究

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摘要

Ferrihydrite has been prevalently used in soil remediation as an effective amendment for in situ immobilization of arsenic (As). However, its poorly crystalline structure is unstable and can pose the risk of re-releasing As into soil. In this study, sequential extraction was coupled with a newly-established method, chelex-metsorb diffusive gradient in thin films (DGT), to study the ferrihydrite transformation/dissolution process and its effect on the mobility of arsenic in soil. Experiments in this work found that high soil moisture (70% SWHC) with a low soil redox potential (Eh) can significantly increase the rate of the ferrihydrite transformation/dissolution process compared to 30% SWHC. Soils with low pH and high available iron (Fe) content may also accelerate ferrihydrite transformation/dissolution, while soils with high clay fraction and high soil total organic matter (STOM) may inhibit the process. The amount of arsenic adsorption can also affect ferrihydrite transformation, even exceeding the effect of soil pH and dissolved Fe. Arsenic release was clearly observed in all three soils across all treatments, and it was also affected by changes in soil redox potential. More arsenic was released at high soil moisture (70% SWHC) roughly 7-15 d after the release of Fe. In addition, a partial arsenic fraction was transformed, along with ferrihydrite, from a combined As (F1-As) amorphous phase to combined As (F2-As) well-crystallized phase. These results suggested that ferrihydrite transformation/dissolution can affect the mobility of arsenic and that this phenomenon is more extreme at higher soil moisture levels.
机译：Ferrihydrite已经普遍存在地用于土壤修复，作为原位固定化的有效修正砷（AS）。然而，它的结晶结构不稳定是不稳定的并且可以使重新释放到土壤中的风险构成。在该研究中，顺序提取与薄膜（DGT）中的新建立的方法，Chelex-Metsorb扩散梯度偶联，研究Ferrihydrite转化/溶出过程及其对土壤中砷的迁移率的影响。在这项工作中的实验发现，具有低土壤氧化还原电位（EH）的高土壤水分（70％SWHC）可以显着提高Ferrihydrite转化/溶解过程的速率与30％SWHC相比。具有低pH和高可用铁（Fe）含量的土壤也可能加速Ferrihydrite转化/溶解，而具有高粘土分数和高土壤总有机物质（STOM）的土壤可能会抑制该过程。砷吸附量也可以影响Ferrihydite转化，甚至超过土壤pH和溶解Fe的效果。在所有治疗中的所有三种土壤中都清楚地观察到砷释放，并且还受土壤氧化还原潜力的变化的影响。在Fe释放后，在高土壤水分（70％SWHC）下，在高土壤水分（70％SWHC）下释放更多砷。另外，将部分砷级分与Ferrihydite一起转化，从组合的As（F1-AS）非晶相中与（F2-AS）结晶相中组合。这些结果表明，Ferrihydrite转化/溶解会影响砷的迁移率，并且这种现象在较高的土壤水分水平下更为极端。

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  • 作者

    Zhang Tuo; Zeng Xibai; Zhang Hao; Lin Qimei; Su Shiming; Wang Yanan; Bai Lingyu; Wu Cuixia;

  • 作者单位

    Chinese Acad Agr Sci Minist Agr Key Lab Agroenvironm Inst Agr Environm &

    Sustainable Dev Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Minist Agr Key Lab Agroenvironm Inst Agr Environm &

    Sustainable Dev Beijing 100081 Peoples R China;

    Univ Lancaster Lancaster Environm Ctr Lancaster LA1 4YQ England;

    China Agr Univ Sch Resource &

    Environm Beijing 100094 Peoples R China;

    Chinese Acad Agr Sci Minist Agr Key Lab Agroenvironm Inst Agr Environm &

    Sustainable Dev Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Minist Agr Key Lab Agroenvironm Inst Agr Environm &

    Sustainable Dev Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Minist Agr Key Lab Agroenvironm Inst Agr Environm &

    Sustainable Dev Beijing 100081 Peoples R China;

    Chinese Acad Agr Sci Minist Agr Key Lab Agroenvironm Inst Agr Environm &

    Sustainable Dev Beijing 100081 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 土壤学;
  • 关键词

    Ferrihydrite; Soils; As; Transformation/dissolution; pH; DGT;

    机译：Ferrihydite;土壤;作为;转化/溶解;pH;DGT;

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