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| 北京市局部大气沉降颗粒表面成分分析 | |
| 引用本文： | 陈婧,陈东梁,许声弟,张东胜,杨剑锋,徐鹏.北京市局部大气沉降颗粒表面成分分析[J].北京化工大学学报(自然科学版),2017,44(2):1-7. |
| 作者姓名： | 陈婧 陈东梁 许声弟 张东胜 杨剑锋 徐鹏 |
| 作者单位： | 北京化工大学机电工程学院,北京,100029;中国矿业大学安全工程学院,北京,100083;国家纳米科学中心中国科学院纳米技术标准化和测量重点实验室,北京,100190 |
| 基金项目： | 中国科学院仪器设备功能开发技术创新项目；北京高等学校青年英才计划项目（YETP0499）；北京市重点学科建设项目 |
| 摘 要： | 采用X射线光电子能谱（XPS）对大气沉降颗粒表面元素组成和元素的存在形式进行分析，发现其表面含有Al、Ca、Si等地壳元素和C、N、O等轻元素。Al、Si、Ca等地壳元素的原子数分数总和高达16.4%，表明大气颗粒物的沉降过程伴随着地壳元素的累积；元素S与N的原子数分数比值接近1，表明没有足够的碱性物质NH3中和酸性物质SO42-，沉降颗粒表面呈现酸性。结合高分辨率XPS图谱分析，发现沉降颗粒物表面的含碳物质以有机含碳化合物为主，同时存在少量的无定型碳；而氮元素则主要来源于以NOx、NH4+为主的无机氮和以吡啶氮为主的有机氮。 |
| 关 键 词： | 沉降颗粒 元素成分 化学状态 X射线光电子能谱(XPS) |
| 收稿时间： | 2016-09-02 |
Composition analysis of the surface of atmospheric deposition particles in Beijing |
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| CHEN Jing,CHEN DongLiang,XU ShengDi,ZHANG DongSheng,YANG JianFeng,XU Peng.Composition analysis of the surface of atmospheric deposition particles in Beijing[J].Journal of Beijing University of Chemical Technology,2017,44(2):1-7. | |
| Authors: | CHEN Jing CHEN DongLiang XU ShengDi ZHANG DongSheng YANG JianFeng XU Peng |
| Institution: | 1. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029; 2. School of Safety Engineering, China University of Mining and Technology, Beijing 100083; 3. CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100090, China |
| Abstract: | The chemical composition and chemical state of some elements in atmospheric deposition particles have been studied by X-ray photoelectron spectroscopy (XPS). It was found that the surface of atmospheric deposition particles contains crustal elements such as Al, Ca and Si and light elements such as C, N, and O. The atomic number fraction of Al, Si, and Ca (up to 16.4%) indicates that the settlement process of atmospheric particles is concomitant with the accumulation of crustal elements. The atomic number fraction ratio of S and N is close to 1, suggesting that there is insufficient alkaline NH3 to neutralize acidic SO42- and the surface of the deposition particles is acidic. High resolution XPS showed that organic hydrocarbons are the dominant carbon species in atmospheric deposition particles, and a small amount of amorphous carbon was also found; In addition, nitrogen occurs as inorganic nitrogen, which is mainly NOx and NH4+, and as organic nitrogen, which is mainly pyridine nitrogen. |
| Keywords: | deposition particles elemental composition chemical state X-ray photoelectron spectroscopy (XPS) |
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