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Interactions of Tc(IV) with Humic Substances

机译：Tc（IV）与腐殖质的相互作用

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摘要

To understand the key processes affecting 99Tc mobility in the subsurface and help with the remediation of contaminated sites, the binding constants of several humic substances (humic and fulvic acids) with Tc(lV) were determined, using a solvent extraction technique. The novelty of this paper lies in the determination of the binding constants of the complexes formed with the individual species TcO(OH)+ and TcO(OH)2 . Binding constants were found to be 6.8 and between 3.9 and 4.3, for log0lf_u andlogj81(_2(i, respectively; these values were little modified by a change of ionic strength, in most cases, between 0.1 and 1.0 M, nor were they by the nature and origin of the humic substances. Modeling calculations based on these show TcO(OH)~HA to be the predominant complex in a system containing 20 ppm HA and in the 4-6 pH range, whereas TcO(OH)2° and TcO(OH)2~HA are the major species, in the pH 6-8 range.
机译：为了了解影响地下99Tc流动性的关键过程并帮助修复受污染的位置，使用溶剂萃取技术确定了几种腐殖质（腐殖酸和富里酸）与Tc（IV）的结合常数。本文的新颖之处在于测定与单个物种TcO（OH）+和TcO（OH）2形成的复合物的结合常数。发现对数log0lf_u和logj81（_2（i）的结合常数分别为6.8和3.9至4.3;在大多数情况下，离子强度的变化对这些值几乎没有影响，在大多数情况下，在0.1至1.0 M之间;腐殖质的性质和来源，基于这些的建模计算表明，TcO（OH）〜HA是包含20 ppm HA且在4-6 pH范围内的系统中的主要络合物，而TcO（OH）2°和TcO （OH）2〜HA是主要种类，pH值为6-8。

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  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.2718-2724|共7页
  • 作者

    Mark A. Boggs; Travis Minton; Wenming Dong; Samuel Lomasney; Mohammed R. Islam; Baohua Gu; Nathalie A. Wall;

  • 作者单位

    Department of Chemistry, Washington State University, Pullman, Washington 99164-4630, United States;

    Department of Chemistry, Washington State University, Pullman, Washington 99164-4630, United States;

    Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States;

    Department of Chemistry, Washington State University, Pullman, Washington 99164-4630, United States;

    Department of Chemistry, Washington State University, Pullman, Washington 99164-4630, United States;

    Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States;

    Department of Chemistry, Washington State University, Pullman, Washington 99164-4630, 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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