Flyash-like Particles in the Eruption Cloud from Sakurajima Volcano

Abstract

Airborne flyash-like spherical particles were measured in eruption cloud from Sakurajima volcano in Kyushu on 1st and 3rd September 1979. Sampling was made by a portable dust sampler with Whatman glass-fiber and polycarbonate filter, and observed by SEM after carbon-gold processing.
Spherical particles of 2-5μm diameter with variety of surface shape were shown: spheres coated with other mineral materials and submicron fine coalescence, and plain flyash-like spheres. These inhalable particles were relevant to be suggested to the carrier particles permitting penetration into the alveolar region and enhancement of inhalation hazard affected by other toxic material absorbed on their surface.