Physicochemical characteristics of ambient particles settling upon leaf surfaces of urban plants in Beijing

查看全文 作　　者：WANG [1,2]Lei;LIU Lian-[1,2]you;GAO Shang-[1]yu;HASI [1,2]Eerdun;WANG [1]Zhi

机构地区：[1]College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China;[2]The College of Resoures Environment and Tourism, Capital Normal University, Beijing 100037, China

出　　处：《Journal of Environmental Sciences》索引2006年第18卷第5期,共6页

基　　金：The National Natural Science Foundation of China (No. 30570338); the Natural Science Foundation of Beijing (No. 6053026) andthe Ministry of Education, China(No. 20040027020). 摘　　要：Particulate pollution is a serious health problem throughout the world, exacerbating a wide range of respiratory and vascular illnesses in urban areas. Urban plants play an important role in reducing particulate pollution. Physicochemical characteristics of ambient particles settling upon leaf surfaces of eleven roadside plants at four sites of Beijing were studies. Results showed that density of particles on the leaf surfaces greatly varied with plant species and traffic condition. Fraxinus chinensis, Sophora japonica, Ailanthus altissima, Syringa oblata and Prunus persica had larger densities of particles among the tall species. Due to resuspension of road dust, the densities of particles of Euonymus japonicus and Parthenocissus quinquefolia with low sampling height were 2—35 times to other taller tree species. For test plant species, micro-roughness of leaf surfaces and density of particles showed a close correlation. In general, the larger micro-roughness of leaf surfaces is, the larger density of particles is. Particles settling upon leaf surfaces were dominantly PM10 (particulate matter less than 10 ?滋m in aerodynamic diameter; 98.4%) and PM2.5 (particulate matter less than 2.5 ?滋m in aerodynamic diameter; 64.2%) which were closely relative to human health. Constant elements of particles were C, O, K, Ca, Si, Al, Mg, Na, Fe, S, Cl and minerals with higher content were SiO2, CaCO3, CaMg(CO3)2, NaCl and 2CaSO4·H2O, SiO2. CaCO3 and CaMg(CO3)2 mainly came from resuspension of road dust. 2CaSO4·H2O was produced by the reaction between CaCO3 derived from earth dust or industrial emission and SO2, H2SO4 or sulfate. NaCl was derived from sea salt. 关键词：微粒物元素成分北京表皮矿物成分

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Physicochemical characteristics of ambient particles settling upon leaf surfaces of urban plants in Beijing

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