Abstract
Mine-mouth power plants near the rich coal deposits of the eastern Transvaal supply most of the electricity used in the Republic of South Africa. Their emissions of particulate matter are a significant fraction of the total from all sources in the region and may be partly the cause of visibility degradation, especially in the dry winter months. A study in the vicinity of seven plants was conducted during November and December 1980 in order to demonstrate the usefulness of cascade impactors, time sequence streaker filter samplers, and elemental analysis by particle-induced x-ray emission (PIXE) for characterizing coal combustion aerosol at a nonurban site where relatively few nearby industrial or natural aerosol sources were present. Particle size analysis indicated a distribution of elements on the particles from principally coarse to principally fine (submicrometer diameter) in the sequence Ti, Al, Ca, Fe, Mn, Cr, Zn, K, Si, and S, apparently reflecting a progression of element volatility during combusti...
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