PIXE法を応用した大気エアロゾル粒子の特性化

抄録

To investigate the physical and chemical characteristics of atmospheric aerosols, three factors of size distribution, concentration and chemical composition are usually most important. Atmospheric aerosols were sampled by using a 12 stages Andersen sampler. Sampling was carried out once a month from July 1995 to June 1996. Sampled aerosols were separated into the soluble and insoluble components. The concentrations of 15 elements in both components were determined by a PIXE analysis. The mass size distribution of particulate matters (PM) was described by a bimodal distribution having one peak each in the fine and coarse fractions. The mass distribution of each element was illustrated in three types: mono-modal distribution having only one peak in the fine or coarse fraction and the bimodal distribution. The size distribution type of each element was estimated by the mass median diameter. The concentration ratio of the each element to PM in the coarse fraction was higher than that in the fine fraction. Solubility of all elements in the fine fraction was higher than that in the fine fraction. Enrichment factor of each element was calculated, and it is suggested that K, Ca, Ti, Mn, Fe in the coarse particles are originated from soil dusts.