摘要
Part physical and chemical characteristics of dust aerosol were determined for samples collected from Otindag Sandland of China in spring, 2001. Number con- centration, mass concentration, chemical element concentra- tion and size distribution of aerosol particles with 0.5 μ m < Dp < 100.0 μ m were examined. The average number and mass concentrations of aerosols were 274.8 cm-3 and 0.54 mg/m3 for the field period respectively, and 31.4 cm-3 and 0.07 mg/m3 for the non-dusty days. PM10 played a dominant role in the aerosol mass concentrations. The particles with Dp < 8.0 μ m accounted for about 93.7% of total aerosol number loading in dusty days. The particle size distributions of aero- sols were characterized by bi-modal logarithm normal func- tion in heavy and moderate dusty days, and mono-modal in windblown and non-dusty days. Crustal elements such as Al, Fe, etc. in aerosols almost originated from soils. Pollutant elements of S, Pb, etc. associated with aerosols were affected by remote anthropogenic pollutant sources in upwind regions. Mo, V and Co in aerosols were possibly from other dust sources other than local soils. The aerosols over Otindag Sandland consisted of particles from local soils, upwind pol- lutant sources and other dust sources.
Abstract Part physical and chemical characteristics of dust aerosol weredetermined for samples collected from Gtindag Sandland of China in spring, 2001. Numberconcentration, mass concentration, chemical element concentration and size distribution of aerosolparticles with 0.5 mu m< D_p < 100.0mu m were examined. The average number and mass concentrationsof aerosols were 274.8 cm^(-3) and 0.54 mg/m for the field period respectively, and 31.4' cm^（-3）and 0.07 mg/m^3 for the non-dusty days. PM10 played a dominant role in the aerosol massconcentrations. The particles with D_p < 8.0 mu m accounted for about 93.7 percent of total aerosolnumber loading in dusty days. The particle size distributions of aerosols were characterized bybi-modal logarithm normal function in heavy and moderate dusty days, and mono-modal in windblown andnon-dusty days. Crustal elements such as Al, Fe, etc. in aerosols almost originated from soils.Pollutant elements of S, Pb, etc. associated with aerosols were affected by remote anthropogenicpollutant sources in upwind regions. Mo, V and Co in aerosols were possibly from other dust sourcesother than local soils. The aerosols over Otindag Sandland consisted of particles from local soils,upwind pollutant sources and other dust sources.
基金
supported by the National Natural Science Foundation of China(Grant No.49790020).
