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首页> 外文期刊>Environmental Science & Technology >Electron Transfer Budgets and Kinetics of Abiotic Oxidation and Incorporation of Aqueous Sulfide by Dissolved Organic Matter
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Electron Transfer Budgets and Kinetics of Abiotic Oxidation and Incorporation of Aqueous Sulfide by Dissolved Organic Matter

机译：溶解性有机物的非生物氧化和水合硫化物的电子转移预算和动力学

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摘要

The reactivity of natural dissolved organic matter toward sulfide and has not been well studied with regard to electron transfer, product formation, and kinetics. We thus investigated the abiotic transformation of sulfide upon reaction with reduced and nonreduced Sigma-Aldrich humic acid (HA), at pH 6 under anoxic conditions. Sulfide reacted with nonreduced HA at conditional rate constants of 0.227- 0.325 h~(-1). The main transformation products were elemental S (S~0) and thiosulfate (S_2O_3~(2-)), yielding electron accepting capacities of 2.82-1.75 μmol e~- (mg C)~(-1). Native iron contents in the HA could account for only 6-9% of this electron transfer. About 22-37% of S reacted with the HA to form organic S (S_(org)). Formation of S_(org) was observed and no inorganic transformation products occurred for reduced HA. X-ray absorption near edge structure spectroscopy supported S_(org) to be mainly zerovalent, such as thiols, organic di- and polysulfides, or heterocycles. In conclusion, our results demonstrate that HA can abiotically reoxidize sulfide in anoxic environments at rates competitive to sulfide oxidation by molecular oxygen or iron oxides.
机译：天然溶解的有机物对硫化物的反应性，尚未就电子转移，产物形成和动力学进行很好的研究。因此，我们在缺氧条件下，在pH为6的条件下，与还原的和未还原的Sigma-Aldrich腐植酸（HA）反应，研究了硫化物的非生物转化。硫化物与未还原的HA以条件速率常数0.227- 0.325 h〜（-1）反应。主要的转化产物是元素S（S〜0）和硫代硫酸盐（S_2O_3〜（2-）），电子接受能力为2.82-1.75μmole〜-（mg C）〜（-1）。 HA中的天然铁含量仅占该电子转移的6-9％。大约22-37％的S与HA反应形成有机S（S_（org））。观察到S_（org）的形成，并且对于还原的HA没有发生无机转化产物。近边缘结构光谱的X射线吸收支持S_（org）主要为零价，例如硫醇，有机二硫化物和多硫化物或杂环。总之，我们的结果表明，HA可以在缺氧环境中以与分子氧或氧化铁的硫化物氧化竞争的速率非生物地再氧化硫化物。

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  • 来源
    《Environmental Science & Technology》 |2015年第9期|5441-5449|共9页
  • 作者

    Zhi-Guo Yu; Stefan Peiffer; Joerg Goettlicher; Klaus-Holger Knorr;

  • 作者单位

    Limnological Research Station & Department of Hydrology, University of Bayreuth, Universitaetsstrasse 30, 95447 Bayreuth, Germany,Hydrology Group, Institute of Landscape Ecology, University of Muenster, Heisenbergstrasse 2, 48149 Muenster, Germany;

    Limnological Research Station & Department of Hydrology, University of Bayreuth, Universitaetsstrasse 30, 95447 Bayreuth, Germany;

    ANKA Synchrotron Radiation Facility, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany;

    Limnological Research Station & Department of Hydrology, University of Bayreuth, Universitaetsstrasse 30, 95447 Bayreuth, Germany,Hydrology Group, Institute of Landscape Ecology, University of Muenster, Heisenbergstrasse 2, 48149 Muenster, Germany;

  • 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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