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首页> 外文期刊>Journal of Contaminant Hydrology >Influence of mineral colloids and humic substances on uranium(Ⅵ) transport in water-saturated geologic porous media
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Influence of mineral colloids and humic substances on uranium(Ⅵ) transport in water-saturated geologic porous media

机译：矿物胶体和腐殖质对水饱和地质多孔介质中铀（Ⅵ）迁移的影响

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摘要

Mineral colloids and humic substances often co-exist in subsurface environment and substantially influence uranium (U) transport. However, the combined effects of mineral colloids and humic substances on U transport are not clear. This study is aimed at quantifying U transport and elucidating geochemical processes that control U transport when both mineral colloids and humic acid (HA) are present U-spiked solutions/suspensions were injected into water-saturated sand columns, and U and colloid concentrations in column effluent were monitored. We found that HA promoted U transport via (ⅰ) formation of aqueous U-HA complexes, and (ⅱ) competition against aqueous U for surface sites on transport media. Illite colloids had no influence on U transport at pH 5 in the absence of HA due to low mobility of the colloids. At pH 9, U desorbed from mobile illite and the presence of illite decreased U transport At pH 5, high U transport occurred when both illite colloids and HA were present which was attributed to enhanced U adsorption to illite colloids via formation of ternary illite-HA-U surface complexes, and enhanced illite transport due to HA attachment to illite and transport media. This study demonstrates that the combined effects of mineral colloids and HA on contaminant transport is different from simple addition of the individual effect.
机译：矿物胶体和腐殖质通常在地下环境中共存，并严重影响铀（U）的运输。但是，尚不清楚矿物胶体和腐殖质对U转运的综合作用。这项研究旨在量化U运移，并阐明在存在矿胶和腐殖酸（HA）的情况下控制U运移的地球化学过程，将U掺入溶液/悬浮液注入饱和水的沙柱中，并将U和胶体浓度注入柱中监测废水。我们发现，HA通过（ⅰ）形成水性U-HA复合物促进了U转运，并且（ⅱ）与U水溶液竞争了转运介质上的表面位点。在没有HA的情况下，伊利石胶体对pH在5的U转运没有影响，因为胶体的迁移率低。在pH 9时，U从活动伊利石中解吸，伊利石的存在降低了U的迁移。在pH 5时，当同时存在伊利石胶体和HA时，发生了较高的U迁移，这归因于三元伊利石-HA形成的U对伊利石胶体的吸附增加-U表面复合物，并由于HA与伊利石和运输介质的附着而增强了伊利石运输。这项研究表明，矿物胶体和HA对污染物迁移的联合作用不同于简单添加单个作用。

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  • 来源
    《Journal of Contaminant Hydrology》 |2014年第12期|76-85|共10页
  • 作者

    Qing Wang; Tao Cheng; Yang Wu;

  • 作者单位

    Environmental Science Program, Faculty of Science, Memorial University, St. John's, Newfoundland and Labrador A1B 3X7, Canada;

    Department of Earth Sciences, Memorial University, St. John's, Newfoundland and Labrador A1B 3X5, Canada;

    Department of Earth Sciences, Memorial University, St. John's, Newfoundland and Labrador A1B 3X5, Canada;

  • 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 transport; Mineral colloids; Humic acid; Adsorption; Column experiments;

    机译：铀运输;矿物胶体;腐植酸;吸附;柱实验;

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