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Relationships Between Dissolved Organic Matter Composition and Photochemistry in Lakes of Diverse Trophic Status

机译：不同营养状态湖泊中溶解性有机物组成与光化学的关系

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摘要

The North Temperate Lakes Long-Term Ecological Research site includes seven lakes in northern Wisconsin that vary in hydrology, trophic status, and landscape position. We examine the molecular composition of dissolved organic matter (DOM) within these lakes using Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS) and quantify DOM photochemical activity using probe compounds. Correlations between the relative intensity of individual molecular formulas and reactive species production demonstrate the influence of DOM composition on photochemistry. For example, highly aromatic, tannin-like formulas correlate positively with triplet formation rates, but negatively with triplet quantum yields, as waters enriched in highly aromatic formulas exhibit much higher rates of light absorption, but only slightly higher rates of triplet production. While commonly utilized optical properties also correlate with DOM composition, the ability of FT-ICR MS to characterize DOM subpopulations provides unique insight into the mechanisms through which DOM source and environmental processing determine composition and photochemical activity.
机译：北温带湖泊长期生态研究站点包括威斯康星州北部的七个湖泊，这些湖泊的水文，营养状况和景观位置各不相同。我们使用傅里叶变换离子回旋共振质谱（FT-ICR MS）检查这些湖泊中溶解有机物（DOM）的分子组成，并使用探针化合物定量DOM光化学活性。各个分子式的相对强度与反应物种的产生之间的相关性证明了DOM组成对光化学的影响。例如，高度芳香的单宁类配方与三重态形成速率正相关，而与三重态量子产率呈负相关，因为富含高度芳族配方的水显示出高得多的光吸收率，但三重态产生率仅稍高。尽管常用的光学特性也与DOM成分相关，但FT-ICR MS表征DOM亚群的能力提供了对DOM来源和环境加工决定组成和光化学活性的机制的独特见解。

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  • 来源
    《Environmental Science & Technology》 |2017年第17期|9624-9632|共9页
  • 作者

    Andrew C. Maizel; Jing Li; Christina K. Remucal;

  • 作者单位

    Department of Civil and Environmental Engineering, University of Wisconsin - Madison Madison, Wisconsin 53706, United States;

    Department of Civil and Environmental Engineering, University of Wisconsin - Madison Madison, Wisconsin 53706, United States;

    Department of Civil and Environmental Engineering, University of Wisconsin - Madison Madison, Wisconsin 53706, United States,Environmental Chemistry and Technology Program, University of Wisconsin - Madison Madison, Wisconsin 53706, 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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