American Industrial Hygiene Conference and Exposition, May 8-13, 2004, Atlanta, Georgia. Fairfax, VA: American Industrial Hygiene Association, 2004 May; :52-53
Particle size distributions in the inhalable size range collected by different personal samplers for wood dust were compared. Samples were collected over a short sampling period (<2 hours) on PVC filters, removed, suspended, and re-deposited evenly on a MCE filter, which was then cleared, and portions examined by optical microscopy. The aerodynamic equivalent diameter (AED) of particles was calculated from their dimensions, shape factor, and density. This method is particularly appropriate to wood-dust particles which are generally large and close to rectangular prisms in shape. Personal samples were collected using the traditional 37-mm closed-face polystyrene/acrylonitrile cassette (CFC), the Institute of Occupational Medicine (IOM) inhalable sampler, and the Button sampler developed by the University of Cincinnati. Total mass concentration results from the method described above were in approximately the same ratios as those from traditional long-term gravimetric samples, but about an order of magnitude higher. The particulate mass appears to be concentrated in the range 10-70 um AED, but with contributions from particles larger than 100 um AED in 65% of the IOM samples, 42% of the CFC samples, and 32% of the Button samples. Where present, these "ultra-large" particles dominated the mass collected, contributing an average 53% (range 10-95%), but significant differences were still found even after accounting for their effect. The IOM and CFC samplers appeared to operate in accordance with previous laboratory studies, as they both collected similar quantities of particles at the smaller size-ranges, up to about 30-40 Um AED, and for larger size-ranges the CFC collection was reduced compared to the IOM. The Button sampler collected significantly less than the IOM at most particle sizes. The Button sampler appears to sample less than the CFC at smaller particle diameters, consistent with some, but not all, relevant laboratory studies.
American Industrial Hygiene Conference and Exposition, May 8-13, 2004, Atlanta, Georgia