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Issue 1, 2012
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Evaluating portable infrared spectrometers for measuring the silica content of coal dust

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Abstract

Miners face a variety of respiratory hazards while on the job, including exposure to silica dust which can lead to silicosis, a potentially fatal lung disease. Currently, field-collected filter samples of silica are sent for laboratory analysis and the results take weeks to be reported. Since the mining workplace is constantly moving into new and often different geological strata with changing silica levels, more timely data on silica levels in mining workplaces could help reduce exposures. Improvements in infrared (IR) spectroscopy open the prospect for end-of-shift silica measurements at mine sites. Two field-portable IR spectrometers were evaluated for their ability to quantify the mass of silica on filter samples loaded with known amounts of either silica or silica-bearing coal dust (silica content ranging from 10–200 μg/filter). Analyses included a scheme to correct for the presence of kaolin, which is a confounder for IR analysis of silica. IR measurements of the samples were compared to parallel measurements derived using the laboratory-based U.S. Mine Safety and Health Administration P7 analytical method. Linear correlations between Fourier transform infrared (FTIR) and P7 data yielded slopes in the range of 0.90–0.97 with minimal bias. Data from a variable filter array spectrometer did not correlate as well, mainly due to poor wavelength resolution compared to the FTIR instrument. This work has shown that FTIR spectrometry has the potential to reasonably estimate the silica exposure of miners if employed in an end-of-shift method.

Graphical abstract: Evaluating portable infrared spectrometers for measuring the silica content of coal dust

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Publication details

The article was received on 18 Aug 2011, accepted on 10 Nov 2011 and first published on 01 Dec 2011


Article type: Paper
DOI: 10.1039/C1EM10678C
Citation: J. Environ. Monit., 2012,14, 48-55
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    Evaluating portable infrared spectrometers for measuring the silica content of coal dust

    A. L. Miller, P. L. Drake, N. C. Murphy, J. D. Noll and J. C. Volkwein, J. Environ. Monit., 2012, 14, 48
    DOI: 10.1039/C1EM10678C

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