摘要
用Streaker时间顺序采样器在火力发电厂附近连续收集大气气溶胶样品.这些样品在2X1.7MV串列加速器上用2.5MeV的质子进行PIXE分析,得到了大气气溶胶粗、细颗粒物中21个元素浓度及其对时间的短时变化,显示了主要污染源方向的信息.结果表明,元素Si,K,Zn和As的浓度高于北京城区冬天的水平,Br/Pb的比值为0.16(n=44),高于一般地区.
Aerosol samples were collected using time sequencing sampler Streaker proving two size fractions for 2. 5-10um and <2. 5um on a continuous time for one week during the period of Apr. 11 to Apr. 17,1990 in the vicinity of the coal-fired power station. Particle induced X-ray emission (PIXE) technique was used to analyze the samples which were bombarded with 2. 5 MeV protons from the 2×1- 7MV tandem accelerator at the Beijing normal univesity. The concentrations of up to 21 elements-. Al, As, Br, Ca, Cl, Co, Cr, Cu, Fe, K, Mg,-Mn, Ni, P, Pb, S, Se, Si, Ti, V and Zn were measured in coarse and fine particles of atmospheric aerosols. The variations in the elemental concentrations with time ajid wind direction were observed as will as some information of the pollution sources and their orientation were obtained from the variations. The elemental concentrations for Si, K, Zn and As in aerosols of the vicinity of the station are higher than that in winter of Beijing downtown area. Concentration ratio for Br to Pb is 0. 16.
出处
《环境化学》
CAS
CSCD
北大核心
1996年第6期505-509,共5页
Environmental Chemistry
基金
国际原子能机构资助
