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首页> 外文期刊>Chemosphere >Influence of competing inorganic cations on the ion exchange equilibrium of the monovalent organic cation metoprolol on natural sediment
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Influence of competing inorganic cations on the ion exchange equilibrium of the monovalent organic cation metoprolol on natural sediment

机译：竞争性无机阳离子对天然沉积物中单价有机阳离子美托洛尔离子交换平衡的影响

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摘要

The aim of this study was to systematically investigate the influence of the mono- and divalent inorganic ions Na~+ and Ca~(2+) on the sorption behavior of the monovalent organic cation metoprolol on a natural sandy sediment at pH = 7. Isotherms for the beta-blocker metoprolol were obtained by sediment-water batch tests over a wide concentration range (1-100000 μg L~(-1)). Concentrations of the competing inorganic ions were varied within freshwater relevant ranges. Data fitted well with the Freundlich sorption model and resulted in very similar Freundlich exponents (n = 0.9), indicating slightly non-linear behavior. Results show that the influence of Ca~(2+) compared to Na~+ is more pronounced. A logarithmic correlation between the Freundlich coefficient K_(Fr) and the concentration or activity of the competing inorganic ions was found allowing the prediction of metoprolol sorption on the investigated sediment at different electrolyte concentrations. Additionally, the organic carbon of the sediment was completely removed for investigating the influence of organic matter on the sorption of metoprolol. The comparison between the experiments with and without organic carbon removal revealed no significant contribution of the organic carbon fraction (0.1%) to the sorption of metoprolol on the in this study investigated sediment. Results of this study will contribute to the development of predictive models for the transport of organic cations in the subsurface.
机译：这项研究的目的是系统地研究一价和二价无机离子Na〜+和Ca〜（2+）对pH = 7的天然沙质沉积物上一价有机阳离子美托洛尔的吸附行为的影响。 β-受体阻滞剂美托洛尔在宽浓度范围（1-100000μgL〜（-1））下通过沉淀-水分批试验获得。竞争性无机离子的浓度在与淡水有关的范围内变化。数据与Freundlich吸附模型非常吻合，并得出非常相似的Freundlich指数（n = 0.9），表明存在轻微的非线性行为。结果表明，与Na〜+相比，Ca〜（2+）的影响更为明显。发现Freundlich系数K_（Fr）与竞争性无机离子的浓度或活性之间存在对数关系，从而可以预测在不同电解质浓度下美托洛尔在被研究沉积物中的吸附情况。另外，为了研究有机物对美托洛尔吸附的影响，沉淀物中的有机碳被完全去除。在有和没有去除有机碳的实验之间的比较表明，在本研究的沉积物中，有机碳部分（0.1％）对美托洛尔的吸附没有显着贡献。这项研究的结果将有助于开发地下有机阳离子运输的预测模型。

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  • 来源
    《Chemosphere》 |2013年第6期|1945-1951|共7页
  • 作者

    Anne Niedbala; Mario Schaffer; Tobias Licha; Karsten Noedler; Hilmar Boernick; Hans Ruppert; Eckhard Worch;

  • 作者单位

    Ceoscience Centre, University of Goettingen, Goldschmidtstr. 3, 37077 Gottingen, Germany;

    Ceoscience Centre, University of Goettingen, Goldschmidtstr. 3, 37077 Gottingen, Germany;

    Ceoscience Centre, University of Goettingen, Goldschmidtstr. 3, 37077 Gottingen, Germany;

    Ceoscience Centre, University of Goettingen, Goldschmidtstr. 3, 37077 Gottingen, Germany;

    Institute of Water Chemistry, Dresden University of Technology, 01062 Dresden, Germany;

    Ceoscience Centre, University of Goettingen, Goldschmidtstr. 3, 37077 Gottingen, Germany;

    Institute of Water Chemistry, Dresden University of Technology, 01062 Dresden, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    metoprolol; competitive sorption; organic cation; ion exchange; geosorbent; freundlich isotherm;

    机译：美托洛尔竞争吸附有机阳离子离子交换;吸附剂等温等温线;

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