Microscopic and spectroscopic analysis of atmospheric iron-containing single particles in Lhasa,Tibet  

作　　者：Junyu Chen Daobin Zhang Yiran Fu Jinhu Wang Xiaomei Cui Ci-ren Qu-zong Qiangying Zhang Chan Jin Bu Duo 

机构地区：[1]School of Ecology and Environment,Tibet University,Lhasa 850000,China [2]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China [3]Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China

出　　处：《Journal of Environmental Sciences》2024年第7期40-50,共11页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.21677116);the environmental risk management and control of industrial solid waste recycling process in low temperature and low pressure with anoxic environment(No.2019YFC190410304);the Second Tibetan Plateau Scientific Expedition and Research Program(Nos.2019QZKK0603,2019QZKK0605);the Central Government Supports the Phased Achievement Funding of Local University Projects(ZCKJZ[2022]No.1,[2021]No.1,[2020]No.1 and[2019]No.44);the"High level talents"training program for Postgraduates of Tibet University,2021-GSP-B016。

摘　　要：The Tibetan Plateau,known as the“Third Pole”,is currently in a state of perturbation caused by intensified human activity.In this study,56 samples were obtained at the five sampling sites in typical area of Lhasa city and their physical and chemical properties were investigated by TEM/EDS,STXM,and NEXAFS spectroscopy.After careful examination of 3387single particles,the results showed that Fe should be one of the most frequent metal elements.The Fe-containing single particles in irregular shape and micrometer size was about7.8%and might be mainly from local sources.Meanwhile,the Fe was located on the subsurface of single particles and might be existed in the form of iron oxide.Interestingly,the core-shell structure of iron-containing particles were about 38.8%and might be present as single-,dual-or triple-core shell structure and multi-core shell structure with the Fe/Si ratios of 17.5,10.5,2.9 and 1.2,respectively.Meanwhile,iron and manganese were found to coexist with identical distributions in the single particles,which might induce a synergistic effect between iron and manganese in catalytic oxidation.Finally,the solid spherical structure of Fe-containing particles without an external layer were about 53.4%.The elements of Fe and Mn were co-existed,and might be presented as iron oxide-manganese oxide-silica composite.Moreover,the ferrous and ferric forms of iron might be co-existed.Such information can be valuable in expanding our understanding of Fe-containing particles in the Tibetan Plateau atmosphere.

关 键 词：Fe-containing single particle Irregular shape Core-shell structure Solid spherical structure Transmission electron microscopy Synchrotron X-ray microscopy 

分 类 号：X513[环境科学与工程—环境工程] P402[天文地球—大气物理学与大气环境]