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NH_3中和酸性物质SO_4^(2-),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NO_x、NH_4^+为主的无机氮和以吡啶氮为主的有机氮。
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 SO4^2- 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.
作者
陈婧
陈东梁
许声弟
张东胜
杨剑锋
徐鹏
CHEN Jing CHEN DongLiang XU ShengDi ZHANG DongSheng YANG JyanFeng XU Peng(College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029 School of Safety Engineering, China University of Mining and Technology, Beijing 100083 CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100090, China)
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2017年第2期1-7,共7页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
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
关键词
沉降颗粒
元素成分
化学状态
X射线光电子能谱(XPS)
deposition particles
elemental composition
chemical state
X-ray photoelectron spectroscopy（XPS）
