关键词: 沙尘天气, 地球化学元素, 浓度, 富集因子

Abstract: Sand aerosols are sampled during April and May,1996,on both side of Helan mountain:Jilantai meteorological station,inner mongolia(West side) and Yinchuan airport,Ningxia(east side).The 35 chemical elements are analysed by using neutron activated methed(NA),and the element concentration features of sand aerosol are reported in this paper.It shows that the concentration of crust elements increases when sand and dust weather occurs,and the concentration increases with the increasing sandstorm intensity.The value of crust elements as a reference material and geochemistry classification are discussed.The enrichment factor of sand aerosol which relate to crust and loess is the highest for absorbent sulphate and sedimental elements.The enrichment factor of mainly absorbent element is also high under dust and sand weather conditions.

Key words: dust and sand weather, geochemical element, concentration, enrichment factor