Field testing of new aerosol sampling method with a porous curved surface as onlet.
Hauck-BC; Grinshpun-SA; Reponen-A; Reponen-T; Willeke-K; Bornschein-RL
Am Ind Hyg Assoc J 1997 Oct; 58(10):713-719
A newly developed aerosol sampling method which uses a porous curved surface as the inlet was field tested side by side with a standard cassette filter sampler in indoor air environments contaminated with dust and fungal spores. A prototype of the button sampler was evaluated as a stationary sampling device in seven homes and a personal sampling device in two homes during environmental cleanup operations. For stationary sampling, the button sampler was operated at a flow rate of 10 liters per minute (l/min) and a suction velocity of 2.7 meters per second (m/sec). The standard stationary sampling cassette was operated at flow rates of 2 and 10l/min and suction velocities of 2.7 and 13m/sec. Personal breathing zone samples were obtained using the button sampler and the standard cassette. The filters were analyzed for total dust gravimetrically. The Collection of Airborne Microorganisms on Nuclepore Filters, Estimation, and Analysis technique was used to analyze fungal spores. Filter particle count distributions were determined using light microscopy. For most of the stationary measurements, good agreement was found between the total dust mass concentrations obtained with the button sampler and standard cassette. The fungal spore concentrations obtained with the button sampler and standard cassette were also highly correlated. Intersample variation in total dust and fungal spore concentrations was higher for the standard cassette than for the button sampler. The intersample variation of the standard cassette increased with decreasing flow rate. Particles were centrally clustered on the standard cassette filter and spread uniformly over the button sampler filter. For personal sampling measurements, the total dust concentrations obtained with the button sampler were in concordance with those obtained with the standard cassette. The authors conclude that the button sampling method offers a useful, precise technique for both personal and stationary exposure monitoring.
NIOSH-Publication; NIOSH-Cooperative-Agreement; Dust-sampling; Dust-samplers; Airborne-dusts; Air-filters; Sampling-equipment; Sampling-methods; Microscopic-analysis; Aerosol-sampling; Aerosol-particles; Gravimetric-analysis; Air-flow
American Industrial Hygiene Association Journal