title: A variable feed rate mechanism for fluidized bed asbestos generators.
abstract: A simple and inexpensive dust feed mechanism has been designed for use with a two-phase fluidized bed generator (FBG). The mechanism is especially useful for generating asbestos aerosols, but may be used with other dusts as well. Using this system, a steady state concentration (39.1 fibers/cc greater than 5 microns in length +/- 6.2%) of asbestos aerosol was maintained in an inhalation chamber for five hours. In addition, FBG output concentration was easily adjusted and quickly equilibrated (within 10 minutes). The system provides a good technique for generating asbestos aerosols for day-long animal exposures.
authors.forename: R G
authors.initials: RG
authors.lastname: Sussman
authors.forename: J M
authors.initials: JM
authors.lastname: Gearhart
authors.forename: M
authors.initials: M
authors.lastname: Lippmann
mesh_terms: D000336:Aerosols; D001194:Asbestos; D017638:Asbestos, Crocidolite; D004391:Dust; D004864:Equipment and Supplies
chemical_list: D000336:Aerosols; D004391:Dust; D017638:Asbestos, Crocidolite; D001194:Asbestos