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Uranium (Ⅵ) transport in saturated heterogeneous media: Influence of kaolinite and humic acid

机译:饱和非均质介质中的铀(Ⅵ)传输:高岭石和腐殖酸的影响

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摘要

Natural aquifers typically exhibit a variety of structural heterogeneities. However, the effect of mineral colloids and natural organic matter on the transport behavior of uranium (U) in saturated heterogeneous media are not totally understood. In this study, heterogeneous column experiments were conducted, and the constructed columns contained a fast-flow domain (FFD) and a slow-flow domain (SFD). The effect of kaolinite, humic acid (HA), and kaolinite/HA mixture on U(VI) retention and release in saturated heterogeneous media was examined. Media heterogeneity significantly influenced U fate and transport behavior in saturated subsurface environment. The presence of kaolinite, HA, and kaolinite/HA enhanced the mobility of U in heterogeneous media, and the mobility of U was the highest in the presence of kaolinite/HA and the lowest in the presence of kaolinite. In the presence of kaolinite, there was no difference in the amount of U released from the FFD and SFD. However, in the presence of HA and kaolinite/HA, a higher amount of U was released from the FFD. The findings in this study showed that medium structure and mineral colloids, as well as natural organic matter in the aqueous phase had significant effects on U transport and fate in subsurface environment. (C) 2018 Elsevier Ltd. All rights reserved.
机译:天然含水层通常表现出多种结构异质性。但是,还没有完全了解矿物胶体和天然有机物对铀在饱和异质介质中的传输行为的影响。在这项研究中,进行了非均相色谱柱实验,构造的色谱柱包含快速流动域(FFD)和缓慢流动域(SFD)。检查了高岭石,腐殖酸(HA)和高岭石/ HA混合物对U(VI)在饱和异质介质中保留和释放的影响。在饱和的地下环境中,介质的异质性极大地影响了最终命运和运输行为。高岭石,HA和高岭石/ HA的存在增强了U在异质介质中的迁移率,并且在高岭石/ HA存在下U的迁移率最高而在高岭石存在下U的迁移率最低。在高岭石的存在下,FFD和SFD释放的U量没有差异。然而,在HA和高岭石/ HA的存在下,FFD释放出更高量的U。这项研究的结果表明,介质结构,矿物胶体以及水相中的天然有机物对地下环境中的U运移和结局具有重大影响。 (C)2018 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Environmental Pollution》 |2018年第9期|219-226|共8页
  • 作者单位

    China Agr Univ, Coll Resources & Environm Sci, Key Lab Plant Soil Interact,Minist Agr, Minist Educ,Key Lab Arable Land Conservat North C, Beijing 100193, Peoples R China;

    China Agr Univ, Coll Resources & Environm Sci, Key Lab Plant Soil Interact,Minist Agr, Minist Educ,Key Lab Arable Land Conservat North C, Beijing 100193, Peoples R China;

    China Agr Univ, Coll Resources & Environm Sci, Key Lab Plant Soil Interact,Minist Agr, Minist Educ,Key Lab Arable Land Conservat North C, Beijing 100193, Peoples R China;

    Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China;

    Guangzhou Univ, Sch Environm Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China;

    Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China;

    China Agr Univ, Dept Grassland Sci, Beijing 100193, Peoples R China;

    China Agr Univ, Beijing Key Lab Farmland Soil Pollut Prevent & Re, Coll Resources & Environm Sci, Beijing 100193, Peoples R China;

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

    Uranium (VI); Transport; Heterogeneous medium; Kaolinite; Humic acid;

    机译:铀;运输;非均质介质;高岭石;腐殖酸;
  • 入库时间 2022-08-17 13:25:53

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