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Mining Publication: Deposition Uniformity of Coal Dust on Filters and its Effect on the Accuracy of FTIR Analyses for Silica
Keywords: Coal dust Filtration systems Silica dust Silicosis
Original creation date: July 2013
Authors: AL Miller, PL Drake, NC Murphy, E Cauda, RF LeBouf, G Markevicius
Peer Reviewed Journal Article - July 2013
Download PDF Document (0.60 MB)
NIOSHTIC2 Number: 20042844
Aerosol Sci Tech 2013 Jul; 47(7):724-733
Miners are exposed to silica-bearing dust which can lead to silicosis, a potentially fatal lung disease. Currently, airborne silica is measured by collecting filter samples and sending them to a laboratory for analysis. Since this may take weeks, a field method is needed to inform decisions aimed at reducing exposures. This study investigates a field-portable Fourier transform infrared (FTIR) method for end-of-shift (EOS) measurement of silica on filter samples. Since the method entails localized analyses, spatial uniformity of dust deposition can affect accuracy and repeatability. The study, therefore, assesses the influence of radial deposition uniformity on the accuracy of the method. Using laboratory-generated Minusil and coal dusts and three different types of sampling systems, multiple sets of filter samples were prepared. All samples were collected in pairs to create parallel sets for training and validation. Silica was measured by FTIR at nine locations across the face of each filter and the data analyzed using a multiple regression analysis technique that compared various models for predicting silica mass on the filters using different numbers of "analysis shots." It was shown that deposition uniformity is independent of particle type (kaolin vs. silica), which suggests the role of aerodynamic separation is negligible. Results also reflected the correlation between the location and number of shots versus the predictive accuracy of the models. The coefficient of variation (CV) for the models when predicting mass of validation samples was 4%-51% depending on the number of points analyzed and the type of sampler used, which affected the uniformity of radial deposition on the filters. It was shown that using a single shot at the center of the filter yielded predictivity adequate for a field method, (93% return, CV approximately 15%) for samples collected with 3-piece cassettes.
Cover image for Deposition Uniformity of Coal Dust on Filters and its Effect on the Accuracy of FTIR Analyses for SilicaPeer Reviewed Journal Article - July 2013
Download PDF Document (0.60 MB)
NIOSHTIC2 Number: 20042844
Aerosol Sci Tech 2013 Jul; 47(7):724-733
See Also
Analysis of the Silica Percent in Airborne Respirable Mine Dust Samples from U.S. Operations
Control of Respirable Dust
Evaluating Portable Infrared Spectrometers for Measuring the Silica Content of Coal Dust
Examination of a Newly Developed Mobile Dry Scrubber (DS) for Coal Mine Dust Control Applications
Exposure Monitoring of Dust and Toxic Substances
Investigation into Dust Exposures and Mining Practices in Mines in the Southern Appalachian Region
Key Design Factors of Enclosed Cab Dust Filtration Systems
Laboratory Evaluation of a Canopy Air Curtain for Controlling Occupational Exposures of Roof Bolters
Silica...It's Not Just Dust
Technology News 528 - Recirculation Filter Is Key to Improving Dust Control in Enclosed Cabs
Workplace Solutions: Reducing Hazardous Dust in Enclosed Operator Cabs During Construction
Page last reviewed: December 9, 2014
Page last updated: December 9, 2014
Content source: National Institute for Occupational Safety and Health, Mining Program
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