关键词: 大气气溶胶;粒径分布;质子X荧光分析;南极长城站

Abstract:

The atmospheric aerosol samples have been taken by a 8-stage cascade impactor sampler over the Antarctic Great Wall Station during Jan. 8 to Feb. 19, 1987. the PIXE analysis was carried out on the 1.7×2 MV tandem accelerator at Beijing Normal University in november of 1987. As a result, the size distribution of mass concentration of 18 elements was obtained. The enrichment factors of various elements in the atmospheric aerosol re lative to the earth crust and the sea water with the salinity 35.0‰ were calculated. The en richment factors of the element Mn, Fe, Si, Ti and Pb arc approximate to 1 relative to the earth crust, thus it indicates that these elements mainly come from soil, the common charac teristic of size distribution is that the concentrations increase after larger than 8Um the enrichment factors of the element K,Ca,Cl,S, Sr, and Br are approximate to 1 relative to the sea water, which indicates that these element mainly come from the marine aerosol, they mainly distribute in the range of 1-8μm; the enrichment factor of various elements on the stage 0 (particle size less than 0.25μm) relatively grow larger, which means that the contri bution of anthropogenic, pollution become larger. According to the analyzing on the characteristic of size distribution of the aerosol mass concentration over the Antarctic Great Wall Station we suggest that the anthropogenic comtaminants of super-fine size are mainly transmitted from the other distant coninents.