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首页> 外文期刊>Environmental Science & Technology >Electron-Donating Phenolic and Electron-Accepting Quinone Moieties in Peat Dissolved Organic Matter: Quantities and Redox Transformations in the Context of Peat Biogeochemistry
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Electron-Donating Phenolic and Electron-Accepting Quinone Moieties in Peat Dissolved Organic Matter: Quantities and Redox Transformations in the Context of Peat Biogeochemistry

机译：泥炭溶解有机物中的电子定性酚和电子接受醌部分：泥炭生物地球化学背景下的数量和氧化还原转化

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摘要

Electron-donating phenolic and electron-accepting quinone moieties in peat dissolved organic matter (DOM) are considered to play key roles in processes defining carbon cycling in northern peatlands. This work advances a flow-injection analysis system coupled to chronoamperometric detection to allow for the simultaneous and highly sensitive determination of these moieties in dilute DOM samples. Analysis of anoxic pore water and oxic pool water samples collected across an ombrotrophic bog in Sweden demonstrated the presence of both phenolic and quinone moieties in peat DOM. The pore water DOM had higher quantities of phenolic but not quinone moieties compared with commonly used model aquatic and terrestrial DOM isolates. Significantly lower phenol content in DOM from oxic pools than DOM from anoxic pore waters indicated oxidative DOM processing in the pools. Consistently, treatment of peat DOM with laccase, a phenol-oxidase, under oxic conditions resulted in an irreversible removal of phenols and reversible oxidation of hydroquinones to quinones. Electron transfer to peat DOM was fully reversible over an electrochemical reduction and subsequent O_(2)-reoxidation cycle, supporting that quinones in peat DOM serve as regenerable microbial electron acceptors in peatlands. The results advance our understanding of redox processes involving phenolic and quinone DOM moieties and their roles in northern peatland carbon cycling.
机译：泥炭溶解有机物（DOM）中的给电子酚和电子接受醌部分被认为在定义北部泥炭地碳循环的过程中起着关键作用。这项工作推动了与计时安培检测耦合的流动注射分析系统，以允许同时，高度灵敏地确定稀释的DOM样品中的这些部分。对瑞典整个营养养护区收集的缺氧孔隙水和含氧池水样品的分析表明，泥炭DOM中同时存在酚类和醌类部分。与常用的模型水生和陆生DOM分离物相比，孔隙水DOM具有较高的酚类含量但不包含醌部分。氧化池中DOM中的苯酚含量明显低于缺氧孔隙水中的DOM，这表明池中氧化DOM的处理能力。一致地，在有氧条件下用漆酶（一种酚氧化酶）处理泥炭DOM导致不可逆地除去苯酚并将对苯二酚可逆地氧化为醌。在电化学还原和随后的O_（2）-再氧化循环中，电子转移到泥炭DOM是完全可逆的，支持泥炭DOM中的醌可作为泥炭地中的可再生微生物电子受体。这些结果使我们对涉及酚和醌DOM部分的氧化还原过程及其在北部泥炭地碳循环中的作用有了更深入的了解。

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  • 来源
    《Environmental Science & Technology》 |2018年第9期|5236-5245|共10页
  • 作者

    Nicolas Walpen; Gordon J. Getzinger; Martin H. Schroth; Michael Sander;

  • 作者单位

    Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, Swiss Federal Institute of Technology (ETH), 8092 Zurich, Switzerland;

    Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, Swiss Federal Institute of Technology (ETH), 8092 Zurich, Switzerland;

    Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, Swiss Federal Institute of Technology (ETH), 8092 Zurich, Switzerland;

    Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, Swiss Federal Institute of Technology (ETH), 8092 Zurich, Switzerland;

  • 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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