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首页> 外文期刊>Environmental Science & Technology >Molecular Chemistry of Atmospheric Brown Carbon Inferred from a Nationwide Biomass Burning Event
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Molecular Chemistry of Atmospheric Brown Carbon Inferred from a Nationwide Biomass Burning Event

机译：从全国生物质燃烧事件中推断出大气中褐碳的分子化学

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摘要

Lag Ba'Omer, a nationwide bonfire festival in Israel, was chosen as a case study to investigate the influence of a major biomass burning event on the light absorption properties of atmospheric brown carbon (BrC). The chemical composition and optical properties of BrC chromophores were investigated using a high performance liquid chromatography (HPLC) platform coupled to photo diode array (PDA) and high resolution mass spectrometry (HRMS) detectors. Substantial increase of BrC light absorption coefficient was observed during the night-long biomass burning event. Most chromophores observed during the event were attributed to nitroaromatic compounds (NAC), comprising 28 elemental formulas of at least 63 structural isomers. The NAC, in combination, accounted for 50-80% of the total visible light absorption (>400 nm) by solvent extractable BrC. The results highlight that NAC, in particular nitrophenols, are important light absorption contributors of biomass burning organic aerosol (BBOA), suggesting that night time chemistry of •NO_3 and N_2O_5 with particles may play a significant role in atmospheric transformations of BrC. Nitrophenols and related compounds were especially important chromophores of BBOA. The absorption spectra of the BrC chromophores are influenced by the extraction solvent and solution pH, implying that the aerosol acidity is an important factor controlling the light absorption properties of BrC.
机译：选择了以色列全国篝火节Lag Ba'Omer作为案例研究，以研究主要生物质燃烧事件对大气棕碳（BrC）的光吸收特性的影响。 BrC发色团的化学组成和光学性质是使用与光电二极管阵列（PDA）和高分辨率质谱（HRMS）检测器耦合的高效液相色谱（HPLC）平台进行研究的。在整夜的生物质燃烧过程中观察到BrC光吸收系数的显着增加。事件中观察到的大多数发色团均归因于硝基芳族化合物（NAC），该化合物包含至少63个结构异构体的28个元素式。 NAC组合起来可吸收溶剂的BrC占总可见光吸收（​​> 400 nm）的50-80％。结果表明，NAC，尤其是硝基酚，是生物质燃烧有机气溶胶（BBOA）的重要光吸收贡献者，表明•NO_3和N_2O_5与颗粒的夜间化学作用可能在BrC的大气转化中起重要作用。硝基酚和相关化合物是BBOA的重要生色团。 BrC发色团的吸收光谱受萃取溶剂和溶液pH值的影响，表明气溶胶酸度是控制BrC吸光性能的重要因素。

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  • 来源
    《Environmental Science & Technology》 |2017年第20期|11561-11570|共10页
  • 作者

    Lin Peng; Bluvshtein Nir; Rudich Y.; Nizkorodov Sergey A.; Laskin Julia; Laskin Alexander;

  • 作者单位

    Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, United States;

    Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel;

    Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel;

    Department of Chemistry, University of California, Irvine, CA, United States;

    Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, United States,Department of Chemistry, Purdue University, West Lafayette, IN, United States;

    Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, United States,Department of Chemistry, Purdue University, West Lafayette, IN, 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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