A method has been developed to generate monodisperse aerosol particles that consist of compounds that are sparingly soluble and non-volatile. A polydisperse dry bulk sample was initially separated into a narrow particle size range with a centrifugal air classifier. Monodisperse aerosol was then generated by atomizing an aqueous slurry that contained the pre-separated sparingly soluble material. Aerosol generated by this new method was compared with aerosol generated by ultrasonic nebulization. Monodisperse CaCO3 (sparingly soluble and non-volatile) aerosol was produced via atomization while Na2CO3 (soluble) aerosol was generated with ultrasonic nebulization. Particle size distributions of both aerosols were determined by an optical particle counter. The mass mean particle size and geometric standard deviation of the CaCO3 aerosol were 3.3 μm, and 1.57, respectively. The Na2CO3 aerosol's mass mean particle size and geometric standard deviation were 3.1 μm and 1.26, respectively. These results indicate that monodisperse aerosol particles that consist of sparingly soluble and non-volatile material can be generated reliably and on a continuous basis. These results are valid for aerosol particles with diameters between 0.3 and 10.0 μm.
ASJC Scopus subject areas
- Environmental Engineering
- Environmental Chemistry
- Waste Management and Disposal