摘要
本文用中子活化分析(INAA)和质子激发X荧光分析(PIXE)法,测定了华北清洁地区气溶胶样品中几十个元素的含量,对粗粒(10—2μm)和细粒(<2μm)两种颗粒物进行了平均元素浓度和富集因子的计算,基于对华北清洁地区获得的颗粒物数据以及不同来源气溶胶化学组成的讨论,得出华北清洁地区大气颗粒物的质量浓度要比城市地区小很多,细颗粒物的平均质量浓度比粗颗粒物的要高,华北清洁地区人为污染元素的粗细比率与城市地区的相比很低,大气污染物主要是由远距离输送来的.
The samples of fine and coarse particulate matter in air have been collected by Gent Stacked Filter Unit sampler at representative clean site of Huabei. Instrumental neutron activation analysis (INAA) and proton induced X-ray emission (PIXE) method were used to determine the elemental composition of the particulate matter. Average elemental con centrations and enrichment factors were calculated for the fine (<2μm) and coarse (10 -2μm) size fractions. According to concentration of the particulate matter obtained at one site of Huabei and the chemical constituents of the aerosols the different sources of them was discussed. The results show that the relative particulate mass and elemental concentrations of crustal and pollutant elements in the particulates collected over the rural are lower than urban. At rural site, the average particulate mass concentrations in fine fraction was larger than in coarse fraction, but at urban site a reverse trend was observed. It may be indicater that the rural aerosols mainly come from long-range transport of natural and anthropogenic pollutants, which transported from urban to rural area by wind.
出处
《环境化学》
CAS
CSCD
北大核心
1998年第1期38-44,共7页
Environmental Chemistry
基金
国际原子能机构资助项目
关键词
颗粒物
气溶胶
大气污染
particulate matter, aerosol, air pollution.
