RAMAN-SCATTERING AND CHARACTERIZATION OF ATMOSPHERIC AEROSOL-PARTICLES
RAMAN-SCATTERING AND CHARACTERIZATION OF ATMOSPHERIC AEROSOL-PARTICLES
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DOI：
10.1038/266708a0
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发表时间：
1977-01-01
期刊：
影响因子：
64.8
通讯作者：
NOVAKOV, T
中科院分区：
文献类型：
--
作者：
ROSEN, H;NOVAKOV, T
空气中的颗粒物在空气污染问题中起着重要作用。它们会造成酸雨、能见度降低，并且在一定尺寸范围内，它们会沉积在肺部，导致各种疾病。人们在使用湿化学、X 射线荧光、红外光谱和 ESCA 等技术分析这些颗粒物方面付出了相当大的努力。然而，许多颗粒物的化学形态和来源仍然存在很大的不确定性。我们在这里描述了通过拉曼光谱表征颗粒污染物的可行性的初步研究。我们相信这是将这种光谱技术应用于该研究领域的首次尝试。研究的样品包括柴油机尾气颗粒、汽车尾气颗粒（无铅燃料，无催化转化器）和一些环境空气样品。将这些样品的光谱与用作参考的多晶石墨和活性炭的光谱进行比较。我们的结果表明，与活性炭类似的物理结构至少是一种主要物种，并且可能是源富集样品和环境样品中的主要物种。这一观测结果对于大气化学、健康影响、天气变化以及气溶胶对反照率的影响可能非常重要。
AIRBORNE particulates have a major role in the air pollution problem. They are responsible for acid rain, reduced visibility, and, in certain size ranges, are deposited in the lungs where they can cause various disorders. Considerable effort has been expended in the analysis of these particulates using techniques such as wet chemistry, X-ray fluorescence, infrared spectroscopy and ESCA. Yet there are still great uncertainties as to the chemical form and origin of many of the particulate species. We describe here preliminary studies of the feasibility of characterising particulate pollutants by means of Raman spectroscopy. We believe that this is the first attempt to apply this spectroscopic technique in this area of research. The samples studied included diesel exhaust particles, automobile exhaust particles (unleaded fuel, no catalytic converter) and several ambient air samples. The spectra from these samples were compared with those of polycrystalline graphite and activated carbon which were used as references. Our results indicate that physical structures similar to activated carbon are at least a major species and may be the dominant species in both source-enriched and ambient samples. The implications of this observation could be quite important in terms of atmospheric chemistry, health effects, weather modifications and the effects of aerosols on the albedo.