Study on the effect of iron on PM10 formation and design of a particle-generating system using a cocentric diffusion burner flame

摘要

Iron pentacarbonyl was added to a cocentric diffusion burner flame burning a mixture of acetylene and ethylene in a co-flowing stream of air. Samples of aerosols and gaseous species were collected within the flames and above the flames with filters and a sampling bottle, and soot volume fraction through the flame was calculated with laser light extinction measurements. Aerosol was isokinetically collected in the inhalation chamber to measure particle concentration and size distribution.Laser extinction measurement showed that iron (Fe) gave an effect on soot formation process and scanning electron microscopy of the aerosol sample showed that soot particle size for the Fe-doped flame was relatively smaller than that of non-Fe-doped flame. Transmission electron microscopy results indicated that Fe species were separated from the soot at the downstream flame.Particles of the soot and Fe mixture could be generated continuously, and the concentration was kept constant under a given experimental condition using the cocentric diffusion flame burner. The mass loading variation for each target concentration (i.e., 100, 200, and 400 mug/m(3)) in the inhalation chamber was less than +/-5% during 10 hr. This particle-generating burner system could be used effectively for a bioassay test to evaluate risk assessment for particulate matter with aerodynamic diameter less than 10 mum (PM10).