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首页> 外文期刊>Environmental Science & Technology >Direct Hydrodynamic Radius Measurement on Dissolved Organic Matter in Natural Waters Using Diffusion NMR
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Direct Hydrodynamic Radius Measurement on Dissolved Organic Matter in Natural Waters Using Diffusion NMR

机译:使用扩散NMR直接测量天然水中溶解有机物的流体动力学半径

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摘要

Dissolved organic matter from natural waters is a complex mixture of various chemical components, which play vital roles in many environmental processes such as the global carbon cycle and the fate of many key anthropogenic pollutants. Despite its environmental significance, dissolved organic matter in natural form has never been studied using nuclear magnetic resonance based hydrodynamic radius measurements due to its extremely low concentration (e.g., a few mg/L) in natural waters. In this study, NMR-based hydrodynamic radius measurements were performed directly on unconcentrated pond, river, and sea waters. The key chemical components of the dissolved organic matters from different sources were identified as carbohydrates, carboxyl-rich alicyclic molecules, and aliphatic molecules. By using the Stokes-Einstein-Sutherland equation, the average hydrodynamic radii of the three key components were calculated.
机译:天然水中溶解的有机物是各种化学成分的复杂混合物,在许多环境过程中发挥着至关重要的作用,例如全球碳循环和许多主要人为污染物的命运。尽管具有环境重要性,但由于天然水中的溶解有机物浓度极低(例如几毫克/升),因此从未使用基于核磁共振的水动力半径测量方法研究过天然形式的溶解有机物。在这项研究中,基于NMR的流体动力学半径测量直接在未浓缩的池塘,河流和海水中进行。来自不同来源的溶解有机物的关键化学成分被确定为碳水化合物,富含羧基的脂环族分子和脂肪族分子。通过使用Stokes-Einstein-Sutherland方程,计算了三个关键部件的平均流体动力学半径。

著录项

  • 来源
    《Environmental Science & Technology》 |2012年第3期|p.1675-1680|共6页
  • 作者

    Gang Zheng; William S. Price;

  • 作者单位

    Nanoscale Organization and Dynamics Group, School of Science and Health, University of Western Sydney, Penrith NSW 2751, Australia;

    Nanoscale Organization and Dynamics Group, School of Science and Health, University of Western Sydney, Penrith NSW 2751, Australia;

  • 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
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