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Effects of Fulvic Acid on Uranium(Ⅵ) Sorption Kinetics

机译：黄腐酸对铀（Ⅵ）吸附动力学的影响

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摘要

This study focuses on the effects of fulvic acid (FA) on uranium(Ⅵ) sorption kinetics to a silica sand. Using a tritium-labeled FA in batch experiments made it possible to investigate sorption rates over a wide range of environmentally relevant FA concentrations (0.37-23 mg L~(-1) TOC). Equilibrium speciation calculations were coupled with an evaluation of U(VI) and FA sorption rates based on characteristic times. This allowed us to suggest plausible sorption mechanisms as a function of solution conditions (e.g., pH, U(Ⅵ)/FA/surface site ratios). Our results indicate that U(Ⅵ) sorption onto silica sand can be either slower or faster in the presence of FA compared to a ligand-free system. This suggests a shift in the underlying mechanisms of FA effects on U(Ⅵ) sorption, from competitive sorption to influences of U(Ⅵ)-FA complexes, in the same system. Changes in metal sorption rates depend on the relative concentrations of metals, organic ligands, and mineral surface sites. Hence, these results elucidate the sometimes conflicting information in the literature about the influence of organic matter on metal sorption rates. Furthermore, they provide guidance for the selection of appropriate sorption equilibration times for experiments that are designed to determine metal distribution coefficients (K_d values) under equilibrium conditions.
机译：这项研究集中于黄腐酸（FA）对铀（Ⅵ）对硅砂的吸附动力学的影响。在批处理实验中使用a标记的FA可以研究在广泛的环境相关FA浓度（0.37-23 mg L〜（-1）TOC）范围内的吸附率。平衡形态计算与基于特征时间的U（VI）和FA吸附速率的评估相结合。这使我们能够提出可能的吸附机制，这是溶液条件的函数（例如pH，U（Ⅵ）/ FA /表面积比）。我们的结果表明，与不含配体的体系相比，在存在FA的情况下，U（Ⅵ）吸附到硅砂上的速度可能更快或更慢。这表明在同一系统中，FA对U（Ⅵ）吸附的潜在机理已从竞争性吸附转变为U（Ⅵ）-FA配合物的影响。金属吸附速率的变化取决于金属，有机配体和矿物表面部位的相对浓度。因此，这些结果阐明了有关有机物对金属吸附速率影响的文献中有时相互矛盾的信息。此外，它们为选择实验确定合适的吸附平衡时间提供了指导，这些实验旨在确定平衡条件下的金属分布系数（K_d值）。

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  • 来源
    《Environmental Science & Technology》 |2013年第12期|6214-6222|共9页
  • 作者

    Ruth M. Tinnacher; Peter S. Nico; James A. Davis; Bruce D. Honeyman;

  • 作者单位

    Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, Colorado 80401, United States,Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States;

    Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States;

    Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States;

    Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, Colorado 80401, United States;

  • 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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  • 正文语种 eng
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