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首页> 外文期刊>Environmental Science & Technology >On Source Identification and Alteration of Single Diesel and Wood Smoke Soot Particles in the Atmosphere; An X-Ray Microspectroscopy Study
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On Source Identification and Alteration of Single Diesel and Wood Smoke Soot Particles in the Atmosphere; An X-Ray Microspectroscopy Study

机译：大气中单柴油和木柴烟尘颗粒物的来源识别和改变； X射线显微光谱研究

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摘要

Diesel and wood combustion are major sources of carbonaceous particles in the atmosphere. It is very hard to distinguish between the two sources by looking at soot particle morphology, but clear differences in the chemical structure of single particles are revealed by C(1s) NEXAFS (near edge X-ray absorption fine structure) microspectroscopy. Soot from diesel combustion has a dominant spectral signature at ～285 eV from aromatic π-bonds, whereas soot from wood combustion has the strongest signature at ～287 eV from phenolic carbon bonds. To investigate if it is possible to use these signatures for source apportionment purposes, we collected atmospheric samples with either diesel or wood combustion as a dominant particle source. No spectra obtained from the atmospheric particles completely matched the emission spectra. Especially particles from the wood dominated location underwent large modifications; the phenolic spectral signature at ～287 eV is greatly suppressed and surpassed by the peak attributed to the aromatic carbon groups at ~285 eV. Comparison with spectra from diesel soot samples experimentally aged with ozone show that very fast modification of the carbon structure of soot particles occurs as soon as they enter the atmosphere. Source attribution of single soot particles with microspectroscopy is thus hardly possible, but NEXAFS remains a powerful tool to study aging effects.
机译：柴油和木材燃烧是大气中碳质颗粒的主要来源。通过观察煤烟颗粒的形态很难区分这两种来源，但是C（1s）NEXAFS（近边缘X射线吸收精细结构）显微光谱揭示了单个颗粒化学结构的明显差异。柴油燃烧产生的烟灰在芳香族π键的〜285 eV处具有主要的光谱特征，而木材燃烧产生的烟灰在酚醛碳键的〜287 eV处具有最强的光谱特征。为了研究是否可以将这些特征用于来源分配，我们收集了以柴油或木材燃烧为主要颗粒来源的大气样品。从大气颗粒获得的光谱没有完全匹配发射光谱。特别是来自木材占主导地位的位置的颗粒进行了较大的修改； 〜287 eV处的酚谱特征被大大抑制，并被〜285 eV处的芳族碳基团峰所超越。与通过臭氧进行实验老化的柴油机烟尘样品的光谱比较表明，烟尘颗粒一旦进入大气，就会非常快速地改变其碳结构。因此，用光谱法很难确定单个烟灰颗粒的来源，但NEXAFS仍然是研究老化效应的有力工具。

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  • 来源
    《Environmental Science & Technology》 |2009年第14期|5339-5344|共6页
  • 作者

    M. G. C. VERNOOIJ; M. MOHR; G. TZVETKOV; V. ZELENAY; T . HUTHWELKER; R . KAEGI; R. GEHRIG; B. GROBETY;

  • 作者单位

    Empa, Swiss Federal Laboratories for Materials Testing and Research, Feuerwerkerstrasse 39, Than, CH-3602, Switzerland;

    Empa, Swiss Federal Laboratories for Materials Testing and Research, Feuerwerkerstrasse 39, Than, CH-3602, Switzerland;

    Paul Scherrer Institut, Swiss Federal Institute of Aquatic Science and Technology;

    Paul Scherrer Institut, Swiss Federal Institute of Aquatic Science and Technology;

    Paul Scherrer Institut, Swiss Federal Institute of Aquatic Science and Technology;

    EAWAG, Swiss Federal Institute of Aquatic Science and Technology;

    Empa, Swiss Federal Laboratories for Materials Testing and Research, Feuerwerkerstrasse 39, Than, CH-3602, Switzerland;

    University of Tribourg, Environmental Mineralogy;

  • 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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