|Generation of Sulfuric Acid Aerosols for Health Effect Studies.
Liu, Benjamin Y. H. ;
Levi., Jak ;
|Minnesota Univ., Minneapolis. Particle Technology Lab.;Environmental Sciences Research Lab., Research Triangle Park, N.C.
Air pollution ;
Sulfuric acid ;
Aerosol generators ;
Laboratory equipment ;
Laboratory animals ;
Design criteria ;
Performance evaluation ;
Particle size distribution ;
Air pollution effect(Animals) ;
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A generator has been developed and constructed for producing sulfuric acid aerosols at 330 liters per minute to an animal exposure chamber of 330 liters internal volume. Sulfuric acid concentrations in the chamber range from 0.13 to 1.3 mg/cu m. Geometrical mean volume diameters of the aerosol range from 0.04 to 0.15 micrometers, and the geometrical standard deviation of the aerosol is about 1.6. The generator operates by atomizing a sulfuric acid solution to form a poly-disperse spray. The droplets are then vaporized in a tube-furnace and the vapor injected into filtered air at room temperature to form a high concentration of small sulfuric acid particles. The aerosol generating system has been evaluated by means of several techniques. Particle size distribution was measured by an Electrical Aerosol Analyzer. Four independent techniques were used to measure the aerosol concentration: an Electrical Aerosol Analyzer, a Quartz-Crystal Aerosol Mass Monitor, filter collection and weighing, and chemical analysis of collected particle samples. Good agreement was found.