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A comparison of two laboratories for the measurement of wood dust using button sampler and diffuse reflection infrared Fourier-transform spectroscopy (DRIFTS).

Authors
Chirila-MM; Sarkisian-K; Andrew-ME; Kwon-C-W; Rando-RJ; Harper-M
Source
Ann Occup Hyg 2015 Apr; 59(3):336-346
NIOSHTIC No.
20045444
Abstract
The current measurement method for occupational exposure to wood dust is by gravimetric analysis and is thus non-specific. In this work, diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) for the analysis of only the wood component of dust was further evaluated by analysis of the same samples between two laboratories. Field samples were collected from six wood product factories using 25-mm glass fiber filters with the Button aerosol sampler. Gravimetric mass was determined in one laboratory by weighing the filters before and after aerosol collection. Diffuse reflection mid-infrared spectra were obtained from the wood dust on the filter which is placed on a motorized stage inside the spectrometer. The metric used for the DRIFTS analysis was the intensity of the carbonyl band in cellulose and hemicellulose at approximately 1735 cm-1. Calibration curves were constructed separately in both laboratories using the same sets of prepared filters from the inhalable sampling fraction of red oak, southern yellow pine, and western red cedar in the range of 0.125-4 mg of wood dust. Using the same procedure in both laboratories to build the calibration curve and analyze the field samples, 62.3% of the samples measured within 25% of the average result with a mean difference between the laboratories of 18.5%. Some observations are included as to how the calibration and analysis can be improved. In particular, determining the wood type on each sample to allow matching to the most appropriate calibration increases the apparent proportion of wood dust in the sample and this likely provides more realistic DRIFTS results.
Keywords
Analytical-methods; Analytical-instruments; Measurement-equipment; Wood-dusts; Wood-products; Gravimetric-analysis; Spectrographic-analysis; Infrared-spectroscopy; Sampling; Sampling-equipment; Aerosols; Aerosol-sampling; Filters; Laboratories; Laboratory-testing; Performance-capability; Equipment-reliability; Carbonyls; Cellulose-fibers; Author Keywords: button sampler; diffuse reflection; DRIFTS; wood infrared spectrum; wood dust
Contact
Martin Harper, Exposure Assessment Branch, National Institute for Occupational Safety and Health, Morgantown, WV 26505, USA
CODEN
AOHYA3
Publication Date
20150401
Document Type
Journal Article
Email Address
mharper@cdc.gov
Fiscal Year
2015
NTIS Accession No.
NTIS Price
Identifying No.
M122014
Issue of Publication
3
ISSN
0003-4878
NIOSH Division
HELD
Priority Area
Manufacturing
Source Name
Annals of Occupational Hygiene
State
WV; LA
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