Simplified method for testing personal inhalable aerosol samplers.
Witschger-O; Willeke-K; Grinshpun-SA; Aizenberg-V; Smith-J; Baron-PA
J Aerosol Sci 1998 Aug; 29(7):855-874
The presently available protocol for evaluating the performance of personal aerosol samplers according to the inhalable convention is difficult to satisfy as it requires a large cross-section wind tunnel. The present study was initiated to simplify and reduce the cost of the test method by mounting the test samplers on a small, stationary torso instead of a full-size rotating manikin. The simplified torso consisted of a rectangular three-dimensional body (33 cm wide, 21 cm deep, 21 cm high). Replicates of the personal inhalable aerosol sampler under consideration were attached in the center of each vertical face of the simplified torso representing the three principal sampling orientations (facing the wind, turned 90 degrees, and turned 180 degrees to the wind). When the samplers were mounted on a full-size manikin, the air flow in the vicinity of the manikin was found to depend on the sampler location, symmetry of the manikin, and position of the manikin's arms. On the simplified torso, the magnitude and direction of the air flow near the samplers were found to be comparable to that of the manikin. When subjected to nearly monodisperse aerosol flows (particle size of 70 m, wind velocity of 50 and 200 cm s-1), both methods yielded aerosol sampling efficiencies that were statistically not different at three major sampling orientations. The advantages of the simplified torso are that fewer measurements need to be made; a smaller, less expensive wind tunnel can be used for the testing; and interlaboratory variability of personal inhalable samplers' performance may be decreased.
Aerosol-particles; Aerosol-sampling; Aerosols; Viscosity; Sampling-equipment; Sampling-methods
Aerosol Research and Exposure Assessment Laboratory, Department of Environmental Health, University of Cincinnati Cincinnati, OH 45267-0056 U.S.A.
Journal of Aerosol Science