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首页> 外文期刊>Environmental Science & Technology >Molecular Characterization of Nitrogen-Containing Organic Compounds in Humic-like Substances Emitted from Straw Residue Burning
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Molecular Characterization of Nitrogen-Containing Organic Compounds in Humic-like Substances Emitted from Straw Residue Burning

机译:秸秆残渣燃烧排放的腐殖质类物质中含氮有机化合物的分子表征

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摘要

The molecular composition of humic-like substances (HULIS) in different aerosol samples was analyzed using an ultrahigh-resolution mass spectrometer to investigate the influence of biomass burning on ambient aerosol composition. HULIS in background aerosols were characterized with numerous molecular formulas similar to biogenic secondary organic aerosols. The abundance of nitrogen-containing organic compounds (NOC), including nitrogen-containing bases (N-bases) and nitroaromatics, increased dramatically in ambient aerosols affected by crop residue burning in the farm field. The molecular distribution of N-bases in these samples exhibited similar patterns to those observed in smoke particles freshly emitted from lab-controlled burning of straw residues but were significantly different with those observed from wood burning. Signal intensity of the major N-bases correlated well with the atmospheric concentrations of potassium and levoglucosan. These N-bases can serve as molecular markers distinguishing HULIS from crop residue burning with from wood burning. More nitroaromatics were detected in ambient aerosols affected by straw burning than in fresh smoke aerosols, indicating that many of them are formed in secondary oxidation processes as smoke plumes evolve in the atmosphere. This study highlights the significant contribution of crop residue burning to atmospheric NOC. Further study is warranted to evaluate the roles of NOC on climate and human health.
机译:使用超高分辨率质谱仪分析了不同气溶胶样品中的类腐殖质(HULIS)的分子组成,以研究生物质燃烧对环境气溶胶组成的影响。背景气溶胶中的HULIS具有许多类似于生物成因的有机有机气溶胶的分子式。受农田中农作物残渣燃烧影响的周围气溶胶中,含氮有机化合物(NOC)(包括含氮碱(N-碱)和硝基芳族化合物)的含量急剧增加。这些样品中N碱的分子分布与在实验室控制的秸秆残渣燃烧过程中新鲜散发的烟雾颗粒中观察到的模式相似,但与木材燃烧过程中观察到的明显不同。主要N碱基的信号强度与钾和左旋葡聚糖的大气浓度密切相关。这些N碱基可作为分子标记,将HULIS与作物残渣燃烧与木材燃烧区分开。在受秸秆燃烧影响的环境气溶胶中检测到的硝基芳族化合物比在新鲜烟雾气溶胶中检测到的硝基芳族化合物更多,这表明它们中的许多是在二次氧化过程中形成的,这是由于烟羽在大气中扩散所致。这项研究强调了作物残渣燃烧对大气NOC的重大贡献。有必要进行进一步的研究来评估NOC在气候和人类健康中的作用。

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  • 来源
    《Environmental Science & Technology》 |2017年第11期|5951-5961|共11页
  • 作者单位

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering and , Peking University, Beijing 100871, China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering and , Peking University, Beijing 100871, China,Beijing Innovation Center for Engineering Sciences and Advanced Technology, Peking University, Beijing 100871, China;

    Division of Environment and '''Department of Chemistry, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering and , Peking University, Beijing 100871, China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering and , Peking University, Beijing 100871, China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering and , Peking University, Beijing 100871, China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering and , Peking University, Beijing 100871, China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering and , Peking University, Beijing 100871, China;

    Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering and , Peking University, Beijing 100871, China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering and , Peking University, Beijing 100871, China;

    Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China;

    Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China;

  • 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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