Abstract
Airborne aerosol samples were collected on Nuclepore filters in the plume of a coal-fired power plant. Transmission and scanning electron microscopes were used to determine the concentration and size distribution of aerosols and an X-ray energy spectrometer was used to determine the elemental composition of individual particles. It was found that on a mass basis, only about 2% of the fly ash aerosol is water soluble. However, due to surface coating of insoluble fly ash particles with water soluble materials, the number of cloud condensation nuclei in a plume can be enhanced multifold over the background concentration. The passivation of the ice nucleation capability of fly ash can be alleviated by the evaporation of surface-deposited compounds.
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