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首页> 外文期刊>Environmental Science & Technology >Compositional Differences between Size Classes of Dissolved Organic Matter from Freshwater and Seawater Revealed by an HPLC-FTIR System
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Compositional Differences between Size Classes of Dissolved Organic Matter from Freshwater and Seawater Revealed by an HPLC-FTIR System

机译：HPLC-FTIR系统揭示的淡水和海水中溶解的有机物尺寸类别之间的组成差异

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摘要

The molecular complexity of dissolved organic matter (DOM) hinders its characterization. New approaches are thus needed for a better understanding of DOM reactivity and fate in aquatic systems. In this study, high-performance liquid chromatography (HPLC), using size-exclusion separation, was coupled with Fourier transform infrared spectroscopy (FTIR). A solvent-elimination interface was used to deposit DOM fractions onto a germanium disk that were then analyzed by FTIR. Samples included ultrafiltered DOM (UDOM) and fulvic acids from the St. Lawrence Estuary and its tributaries. Results showed significant compositional changes with molecular size and origin, especially in UDOM. Larger fractions of UDOM contained more carbohydrates, amides, aromatics/alkenes and aliphatics, while smaller fractions contained more carboxylate and OH groups. Small marine molecules (500-900 Da) were also enriched in sulfate groups that appeared bound to UDOM. Large marine molecules were the most amide-rich fractions. Fulvic acids were enriched in carboxylate and OH groups, showed little changes in composition, and appeared similar to small terrigenous (riverine) UDOM even in marine water. This work shows that an HPLC-FTIR system is a powerful and complementary tool in the characterization of DOM. The compositional changes observed may explain the reported contrasting reactivity and fate of DOM having different size and origin.
机译：溶解有机物（DOM）的分子复杂性阻碍了其表征。因此，需要新的方法来更好地了解水生系统中的DOM反应性和命运。在这项研究中，使用尺寸排阻分离的高效液相色谱（HPLC）与傅立叶变换红外光谱（FTIR）结合。使用溶剂消除界面将DOM馏分沉积到锗盘上，然后通过FTIR分析。样本包括超滤DOM（UDOM）和来自圣劳伦斯河口及其支流的富里酸。结果显示，随着分子大小和来源的变化，成分发生了显着变化，尤其是在UDOM中。 UDOM的较大部分包含更多的碳水化合物，酰胺，芳烃/烯烃和脂肪族化合物，而较小的部分则包含更多的羧酸根和OH基。海洋中的小分子（500-900 Da）也富含似乎与UDOM结合的硫酸盐基团。海洋中的大分子是酰胺含量最高的部分。黄腐酸富含羧酸根和OH基，组成变化很小，甚至在海水中也类似于小型陆生（河流）UDOM。这项工作表明，HPLC-FTIR系统是表征DOM的功能强大且互补的工具。观察到的成分变化可以解释所报道的具有不同大小和来源的DOM的对比反应性和结局。

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  • 来源
    《Environmental Science & Technology》 |2012年第3期|p.1700-1707|共8页
  • 作者

    Christian Landry; Luc Tremblay;

  • 作者单位

    Department of Chemistry and Biochemistry, Universite de Moncton, Moncton, New Brunswick, Canada E1A 3E9;

    Department of Chemistry and Biochemistry, Universite de Moncton, Moncton, New Brunswick, Canada E1A 3E9;

  • 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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