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Solid versus liquid particle sampling efficiency of three personal aerosol samplers when facing the wind.
Koehler KA; Anthony TR; Van Dyke M; Volckens J
Ann Occup Hyg 2012 Mar; 56(2):194-206
The objective of this study was to examine the facing-the-wind sampling efficiency of three personal aerosol samplers as a function of particle phase (solid versus liquid). Samplers examined were the IOM, Button, and a prototype personal high-flow inhalable sampler head (PHISH). The prototype PHISH was designed to interface with the 37-mm closed-face cassette and provide an inhalable sample at 10 l min(-1) of flow. Increased flow rate increases the amount of mass collected during a typical work shift and helps to ensure that limits of detection are met, particularly for well-controlled but highly toxic species. Two PHISH prototypes were tested: one with a screened inlet and one with a single-pore open-face inlet. Personal aerosol samplers were tested on a bluff-body disc that was rotated along the facing-the-wind axis to reduce spatiotemporal variability associated with sampling supermicron aerosol in low-velocity wind tunnels. When compared to published data for facing-wind aspiration efficiency for a mouth-breathing mannequin, the IOM oversampled relative to mannequin facing-the-wind aspiration efficiency for all sizes and particle types (solid and liquid). The sampling efficiency of the Button sampler was closer to the mannequin facing-the-wind aspiration efficiency than the IOM for solid particles, but the screened inlet removed most liquid particles, resulting in a large underestimation compared to the mannequin facing-the-wind aspiration efficiency. The open-face PHISH results showed overestimation for solid particles and underestimation for liquid particles when compared to the mannequin facing-the-wind aspiration efficiency. Substantial (and statistically significant) differences in sampling efficiency were observed between liquid and solid particles, particularly for the Button and screened-PHISH, with a majority of aerosol mass depositing on the screened inlets of these samplers. Our results suggest that large droplets have low penetration efficiencies through screened inlets and that particle bounce, for solid particles, is an important determinant of aspiration and sampling efficiencies for samplers with screened inlets.
Equipment reliability; Samplers; Sampling equipment; Inhalants; Performance capability; Aerosol sampling; Air samplers; Air sampling equipment; Air flow; Particle aerodynamics; Laboratory testing; Filtration; Air filters; Air contamination; Environmental pollution; Indoor air pollution; Exposure chambers; Exposure methods; Exposure assessment; Testing equipment; Aerosol particles; Particulate dust; Exposure limits; Equipment design; Gravimetry; Author Keywords: aerosols; dust sampling conventions; exposure assessment; gravimetric analysis; inhalable dust
John Volckens, Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, CO 80523-1681, USA
Grant; Cooperative Agreement
Grant-Number-R21-OH-009114; Cooperative-Agreement-Number-U54-OH-008085; B05222012 Grant-Number-T42-OH-008491
Issue of Publication
Agriculture, Forestry and Fishing
Annals of Occupational Hygiene
Colorado State University - Fort Collins
Page last reviewed: January 29, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division