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首页> 外文期刊>Environmental Science & Technology >Fluorescence Spectroscopy Reveals Ubiquitous Presence of Oxidized and Reduced Quinones in Dissolved Organic Matter
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Fluorescence Spectroscopy Reveals Ubiquitous Presence of Oxidized and Reduced Quinones in Dissolved Organic Matter

机译：荧光光谱显示溶解的有机物中普遍存在氧化和还原的醌类

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摘要

Excitation-emission matrixes(EEMs)of 379 dissolved organic matter(DOM)samples from diverse aquatic environments were modeled by parallel factor analysis(PARAFAC).Thirteen components likely representing groups of similarly fluorescing moieties were found to explain the variation in this data set.Seven of the thirteen components were identified as quinone-like based on comparison of their excitation and emission spectra to spectra of model quinones.These quinone-like fluorophores were found to vary in redox state and degree of conjugation.Two components were identified as amino acid-like based on comparison to tyrosine and tryptophan fluorescence spectra.The other four components are not yet associated with any class of molecules.The quinone-like fluorophores account for about 50% of the fluorescence for every sample analyzed,showing that quinone-like fluorophores are an important and ubiquitous fluorescing moiety and in natural waters.Further,the distribution of the quinone-like fluorophores was evaluated as a function of environmental and laboratory redox gradients.Under reducing conditions,the contribution of the reduced quinone-like fluorophores increased concurrent with a decrease in the oxidized quinone-like fluorophores,indicating that DOM fluorescence is a function of redox state of quinone-like moieties.Lastly,a ratio of two quinone-like fluorophores was found to explain the variation in the fluorescence index.These results provide new insight into the redox reactivity of DOM and have implications for the application of fluorescence spectroscopy as a tool to characterize DOM.
机译：通过并行因子分析（PARAFAC）对来自不同水生环境的379种溶解有机物（DOM）样品的激发-排放矩阵（EEM）进行建模，发现了13个可能代表相似荧光部分组的组分来解释此数据集的变化。通过将13种成分的激发和发射光谱与模型醌的光谱进行比较，鉴定出13种成分为醌样，发现这些醌类荧光团的氧化还原状态和共轭程度不同，两种成分被鉴定为氨基酸。根据与酪氨酸和色氨酸荧光光谱比较得出的类似物。其他四个组分尚未与任何种类的分子缔合。醌类荧光团占每个分析样品中荧光的约50％，表明醌类荧光团是重要且普遍存在的发荧光部分，在自然水中也是如此。醌类氟化合物的分布在还原条件下，还原的醌型荧光团的贡献增加，而氧化的醌型荧光团减少，这表明DOM荧光是氧化还原态的函数。最后，发现两种醌类荧光团的比率可以解释荧光指数的变化。这些结果为DOM的氧化还原反应性提供了新的见识，并为将荧光光谱作为一种工具应用于表征DOM。

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  • 来源
    《Environmental Science & Technology》 |2005年第21期|p.8142-8149|共8页
  • 作者

    ROSE M.CORY; DIANE M.MCKNIGHT;

  • 作者单位

    The Institute of Arctic and Alpine Research and Civil and Environmental Engineering,University of Colorado,Boulder,Colorado;

    The Institute of Arctic and Alpine Research and Civil and Environmental Engineering,University of Colorado,Boulder,Colorado;

  • 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 环境化学;
  • 关键词

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