Quartz in coal dust deposited on internal surface of respirable size selective samplers.
Soo-J-C; Lee-T; Kashon-M; Kusti-M; Harper-M
J Occup Environ Hyg 2014 Dec; 11(12):D215-D219
The objective of the present study is to quantify quartz mass in coal dust deposited on internal cassette surface of respirable size-selective samplers. Coal dust was collected with four different respirable size-selective samplers (10 mm Dorr-Oliver nylon, SKC Aluminum, BGI4L, and GK2.69 cyclones) with two different cassette types (polystyrene and static-dissipative polypropylene cassettes). The coal dust was aerosolized in a calm air chamber by using a fluidized bed aerosol generator without neutralization under the assumption that the procedure is similar to field sampling conditions. The mass of coal dust was measured gravimetrically and quartz mass was determined by Fourier transform infrared spectroscopy according to NIOSH Manual of Analytical Method 7603. The mass fractions of the total quartz sample on the internal cassette surface are significantly different between polystyrene and static-dissipative cassettes for all cyclones (p<0.05). No consistent relationship between quartz mass on cassette internal surface and coal dust filter mass was observed. The BGI4L cyclone showed larger (but not significantly) and the GK2.69 cyclone showed significantly lower (p<0.05) internal surface deposit quartz mass fraction for polystyrene cassettes compared to other cyclones. This study confirms previous observations that the interior surface deposits in polystyrene cassettes attached to cyclone pre-selectors can be a substantial part of the sample, and therefore need to be included in any analysis for accurate exposure assessment. On the other hand, the research presented here supports the position that the internal surface deposits in static-dissipative cassettes used with size-selective cyclones are negligible and that it is only necessary to analyze the filter catch.
Coal-dust; Quartz-dust; Respirable-dust; Samplers; Sampling; Sampling-equipment; Aerosol-generators; Aerosol-particles; Cyclone-air-samplers; Gravimetric-analysis; Gravimetry; Analytical-Method; Spectroscopes; Exposure-assessment; Surface-properties; Filters; Analytical-instruments; Analytical-processes; Equipment-design
Mining: Oil and Gas Extraction
Journal of Occupational and Environmental Hygiene