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羟基自由基对不同来源溶解性有机质(DOM)的氧化能力

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李宁, 乔显亮, 刘远, 周菲. 羟基自由基对不同来源溶解性有机质(DOM)的氧化能力[J]. 环境化学, 2015, 34(7): 1246-1251. doi: 10.7524/j.issn.0254-6108.2015.07.2014121707
引用本文: 李宁, 乔显亮, 刘远, 周菲. 羟基自由基对不同来源溶解性有机质(DOM)的氧化能力[J]. 环境化学, 2015, 34(7): 1246-1251. doi: 10.7524/j.issn.0254-6108.2015.07.2014121707
shu
LI Ning, QIAO Xianliang, LIU Yuan, ZHOU Fei. Oxidization of dissolved organic matters from different sources by hydroxyl radical[J]. Environmental Chemistry, 2015, 34(7): 1246-1251. doi: 10.7524/j.issn.0254-6108.2015.07.2014121707
Citation: LI Ning, QIAO Xianliang, LIU Yuan, ZHOU Fei. Oxidization of dissolved organic matters from different sources by hydroxyl radical[J]. Environmental Chemistry, 2015, 34(7): 1246-1251. doi: 10.7524/j.issn.0254-6108.2015.07.2014121707
shu

羟基自由基对不同来源溶解性有机质(DOM)的氧化能力

  • 1.

    大连理工大学环境学院, 工业生态与环境工程教育部重点实验室, 大连, 116024

  • 基金项目:

    国家自然科学基金项目(21277018,21137001)资助.

Oxidization of dissolved organic matters from different sources by hydroxyl radical

  • 1.

    Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China

  • Fund Project:

  • 摘要: 采用总有机碳分析仪、紫外-可见吸收光谱以及荧光激发-发射光谱(EEMs)对5种不同来源DOM与·OH的反应过程进行了表征,以考察DOM来源和类别对其与·OH反应的影响.结果表明,不同来源DOM与·OH 的反应能力存在显著差异,陆源DOM比水源DOM表现出更强的反应能力.DOM与·OH的反应表现为准一级动力学,以DOC变化表征的反应速率常数kDOC与DOM的芳香碳/脂肪碳的比值(Caro/Cali)有较好的相关性,说明芳香性碳可能是·OH的优先反应位点.以光吸收参数Absave表征的衰减速率常数与kDOC也表现出良好的相关性.因来源与类别的差异,不同DOM不仅初始的EEMs存在差别,而且·OH氧化过程中EEMs的变化也表现出显著的不同.
    Abstract: In this study, TOC analyzer, ultraviolet-visible absorption spectra and fluorescence excitation-emission matrices (EEMs) were used to characterize the reactions between ·OH and DOM from different sources. Terrestrial DOMs demonstrated higher reactivity with ·OH than aquatic DOMs. The reactions followed pseudo-first-order kinetics as characterized by DOC decline. The reaction rate constants kDOC related well to the ratio of aromatic carbon to aliphatic carbon to aliphatic carbon (Caro/Cali), which indicated that aromatic carbon might be the preferential reaction sites for ·OH, and the attenuation rate constants (kAbsave) characterized by light absorption parameter. Due to the difference in origin and type, various DOMs demonstrated not only different EEMs before oxidation, but also various change during the oxidation by ·OH.
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  • 收稿日期:  2014-12-17
  • 刊出日期:  2015-07-15
李宁, 乔显亮, 刘远, 周菲. 羟基自由基对不同来源溶解性有机质(DOM)的氧化能力[J]. 环境化学, 2015, 34(7): 1246-1251. doi: 10.7524/j.issn.0254-6108.2015.07.2014121707
引用本文: 李宁, 乔显亮, 刘远, 周菲. 羟基自由基对不同来源溶解性有机质(DOM)的氧化能力[J]. 环境化学, 2015, 34(7): 1246-1251. doi: 10.7524/j.issn.0254-6108.2015.07.2014121707
shu
LI Ning, QIAO Xianliang, LIU Yuan, ZHOU Fei. Oxidization of dissolved organic matters from different sources by hydroxyl radical[J]. Environmental Chemistry, 2015, 34(7): 1246-1251. doi: 10.7524/j.issn.0254-6108.2015.07.2014121707
Citation: LI Ning, QIAO Xianliang, LIU Yuan, ZHOU Fei. Oxidization of dissolved organic matters from different sources by hydroxyl radical[J]. Environmental Chemistry, 2015, 34(7): 1246-1251. doi: 10.7524/j.issn.0254-6108.2015.07.2014121707
shu

羟基自由基对不同来源溶解性有机质(DOM)的氧化能力

  • 1. 大连理工大学环境学院, 工业生态与环境工程教育部重点实验室, 大连, 116024
  • 收稿日期:  2014-12-17
基金项目:

国家自然科学基金项目(21277018,21137001)资助.

摘要: 采用总有机碳分析仪、紫外-可见吸收光谱以及荧光激发-发射光谱(EEMs)对5种不同来源DOM与·OH的反应过程进行了表征,以考察DOM来源和类别对其与·OH反应的影响.结果表明,不同来源DOM与·OH 的反应能力存在显著差异,陆源DOM比水源DOM表现出更强的反应能力.DOM与·OH的反应表现为准一级动力学,以DOC变化表征的反应速率常数kDOC与DOM的芳香碳/脂肪碳的比值(Caro/Cali)有较好的相关性,说明芳香性碳可能是·OH的优先反应位点.以光吸收参数Absave表征的衰减速率常数与kDOC也表现出良好的相关性.因来源与类别的差异,不同DOM不仅初始的EEMs存在差别,而且·OH氧化过程中EEMs的变化也表现出显著的不同.

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