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Wood dust sampling: field evaluation of personal samplers when large particles are present.

Lee T, Harper M, Slaven JE, Lee K, Rando RJ, Maples EH - Ann Occup Hyg (2010)

Bottom Line: Geometric mean (geometric standard deviation) and arithmetic mean (standard deviation) of wood dust were 0.98 mg m(-3) (3.06) and 2.12 mg m(-3) (7.74), respectively.One percent of the samples exceeded 15 mg m(-3), 6% exceeded 5 mg m(-3), and 48% exceeded 1 mg m(-3).Statistical evaluation of the nonsimilar sampler pair results produced a finding of no significant difference between any pairing of sampler type.

View Article: PubMed Central - PubMed

Affiliation: Exposure Assessment Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV 26505, USA. fwc8@cdc.gov

ABSTRACT
Recent recommendations for wood dust sampling include sampling according to the inhalable convention of International Organization for Standardization (ISO) 7708 (1995) Air quality--particle size fraction definitions for health-related sampling. However, a specific sampling device is not mandated, and while several samplers have laboratory performance approaching theoretical for an 'inhalable' sampler, the best choice of sampler for wood dust is not clear. A side-by-side field study was considered the most practical test of samplers as laboratory performance tests consider overall performance based on a wider range of particle sizes than are commonly encountered in the wood products industry. Seven companies in the wood products industry of the Southeast USA (MS, KY, AL, and WV) participated in this study. The products included hardwood flooring, engineered hardwood flooring, door skins, shutter blinds, kitchen cabinets, plywood, and veneer. The samplers selected were 37-mm closed-face cassette with ACCU-CAP™, Button, CIP10-I, GSP, and Institute of Occupational Medicine. Approximately 30 of each possible pairwise combination of samplers were collected as personal sample sets. Paired samplers of the same type were used to calculate environmental variance that was then used to determine the number of pairs of samples necessary to detect any difference at a specified level of confidence. Total valid sample number was 888 (444 valid pairs). The mass concentration of wood dust ranged from 0.02 to 195 mg m(-3). Geometric mean (geometric standard deviation) and arithmetic mean (standard deviation) of wood dust were 0.98 mg m(-3) (3.06) and 2.12 mg m(-3) (7.74), respectively. One percent of the samples exceeded 15 mg m(-3), 6% exceeded 5 mg m(-3), and 48% exceeded 1 mg m(-3). The number of collected pairs is generally appropriate to detect a 35% difference when outliers (negative mass loadings) are removed. Statistical evaluation of the nonsimilar sampler pair results produced a finding of no significant difference between any pairing of sampler type. A practical consideration for sampling in the USA is that the ACCU-CAP™ is similar to the sampler currently used by the Occupational Safety and Health Administration for purposes of demonstrating compliance with its permissible exposure limit for wood dust, which is the same as for Particles Not Otherwise Regulated, also known as inert dust or nuisance dust (Method PV2121).

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The box plot of wood dust mass concentration (milligrams per cubic meter) by different samplers without outliers. The horizontal lines in the box plot from bottom to top indicate 10th, 25th, 50th (median), 75th, and 90th percentiles. The circles indicate the 5th (lower circle) and 95th (upper circle) percentiles. N is the number of samples for each sampler, and the total sample number is 888 when all samplers combined.
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fig3: The box plot of wood dust mass concentration (milligrams per cubic meter) by different samplers without outliers. The horizontal lines in the box plot from bottom to top indicate 10th, 25th, 50th (median), 75th, and 90th percentiles. The circles indicate the 5th (lower circle) and 95th (upper circle) percentiles. N is the number of samples for each sampler, and the total sample number is 888 when all samplers combined.

Mentions: The box plot for wood dust mass concentration collected by each sampler at the seven different wood product industries with total sample number (N) is shown in Fig. 3. The median mass concentration of wood dust for ACCU-CAP™, Button, CIP10-I, GSP, and IOM samplers were 0.90, 0.87, 1.08, 0.95, and 1.06, respectively. The mass concentrations of wood dust collected by ACCU-CAP™ ranged from 0.02 to 195 mg m−3 with GM (GSD) of 1.03 mg m−3 (3.25). The mass concentrations of wood dust collected by Button sampler ranged from 0.03 to 7.68 mg m−3 with GM (GSD) of 0.88 mg m−3 (2.64). The mass concentrations of wood dust collected by CIP10-I sampler ranged from 0.02 to 49.5 mg m−3 with GM (GSD) of 1.01 mg m−3 (3.46). The mass concentrations of wood dust collected by GSP ranged from 0.07 to 29.9 mg m−3 with GM (GSD) of 0.90 mg m−3 (2.94) mg m−3. The mass concentrations of wood dust collected by IOM sampler (filter plus cassette) ranged from 0.14 to 38.7 mg m−3 with GM (GSD) of 1.28 mg m−3 (2.80). The mass concentrations from all five different samplers were not statistically significant different (P > 0.05). GM (GSD) of the IOM sampler with filter-only analysis was 1.06 mg m−3 (2.92) and the range of the concentration was between 0.04 and 37.39 mg m−3. The GM and arithmetic mean difference between the concentrations from IOM samples weighing the filter-only and samples weighing both the filter plus cassette were 0.28 and 0.24 mg m−3, respectively. The two groups are not significantly different (P = 0.78) and the filter-only concentrations were not statistically different from the other samplers.


Wood dust sampling: field evaluation of personal samplers when large particles are present.

Lee T, Harper M, Slaven JE, Lee K, Rando RJ, Maples EH - Ann Occup Hyg (2010)

The box plot of wood dust mass concentration (milligrams per cubic meter) by different samplers without outliers. The horizontal lines in the box plot from bottom to top indicate 10th, 25th, 50th (median), 75th, and 90th percentiles. The circles indicate the 5th (lower circle) and 95th (upper circle) percentiles. N is the number of samples for each sampler, and the total sample number is 888 when all samplers combined.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3037778&req=5

fig3: The box plot of wood dust mass concentration (milligrams per cubic meter) by different samplers without outliers. The horizontal lines in the box plot from bottom to top indicate 10th, 25th, 50th (median), 75th, and 90th percentiles. The circles indicate the 5th (lower circle) and 95th (upper circle) percentiles. N is the number of samples for each sampler, and the total sample number is 888 when all samplers combined.
Mentions: The box plot for wood dust mass concentration collected by each sampler at the seven different wood product industries with total sample number (N) is shown in Fig. 3. The median mass concentration of wood dust for ACCU-CAP™, Button, CIP10-I, GSP, and IOM samplers were 0.90, 0.87, 1.08, 0.95, and 1.06, respectively. The mass concentrations of wood dust collected by ACCU-CAP™ ranged from 0.02 to 195 mg m−3 with GM (GSD) of 1.03 mg m−3 (3.25). The mass concentrations of wood dust collected by Button sampler ranged from 0.03 to 7.68 mg m−3 with GM (GSD) of 0.88 mg m−3 (2.64). The mass concentrations of wood dust collected by CIP10-I sampler ranged from 0.02 to 49.5 mg m−3 with GM (GSD) of 1.01 mg m−3 (3.46). The mass concentrations of wood dust collected by GSP ranged from 0.07 to 29.9 mg m−3 with GM (GSD) of 0.90 mg m−3 (2.94) mg m−3. The mass concentrations of wood dust collected by IOM sampler (filter plus cassette) ranged from 0.14 to 38.7 mg m−3 with GM (GSD) of 1.28 mg m−3 (2.80). The mass concentrations from all five different samplers were not statistically significant different (P > 0.05). GM (GSD) of the IOM sampler with filter-only analysis was 1.06 mg m−3 (2.92) and the range of the concentration was between 0.04 and 37.39 mg m−3. The GM and arithmetic mean difference between the concentrations from IOM samples weighing the filter-only and samples weighing both the filter plus cassette were 0.28 and 0.24 mg m−3, respectively. The two groups are not significantly different (P = 0.78) and the filter-only concentrations were not statistically different from the other samplers.

Bottom Line: Geometric mean (geometric standard deviation) and arithmetic mean (standard deviation) of wood dust were 0.98 mg m(-3) (3.06) and 2.12 mg m(-3) (7.74), respectively.One percent of the samples exceeded 15 mg m(-3), 6% exceeded 5 mg m(-3), and 48% exceeded 1 mg m(-3).Statistical evaluation of the nonsimilar sampler pair results produced a finding of no significant difference between any pairing of sampler type.

View Article: PubMed Central - PubMed

Affiliation: Exposure Assessment Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV 26505, USA. fwc8@cdc.gov

ABSTRACT
Recent recommendations for wood dust sampling include sampling according to the inhalable convention of International Organization for Standardization (ISO) 7708 (1995) Air quality--particle size fraction definitions for health-related sampling. However, a specific sampling device is not mandated, and while several samplers have laboratory performance approaching theoretical for an 'inhalable' sampler, the best choice of sampler for wood dust is not clear. A side-by-side field study was considered the most practical test of samplers as laboratory performance tests consider overall performance based on a wider range of particle sizes than are commonly encountered in the wood products industry. Seven companies in the wood products industry of the Southeast USA (MS, KY, AL, and WV) participated in this study. The products included hardwood flooring, engineered hardwood flooring, door skins, shutter blinds, kitchen cabinets, plywood, and veneer. The samplers selected were 37-mm closed-face cassette with ACCU-CAP™, Button, CIP10-I, GSP, and Institute of Occupational Medicine. Approximately 30 of each possible pairwise combination of samplers were collected as personal sample sets. Paired samplers of the same type were used to calculate environmental variance that was then used to determine the number of pairs of samples necessary to detect any difference at a specified level of confidence. Total valid sample number was 888 (444 valid pairs). The mass concentration of wood dust ranged from 0.02 to 195 mg m(-3). Geometric mean (geometric standard deviation) and arithmetic mean (standard deviation) of wood dust were 0.98 mg m(-3) (3.06) and 2.12 mg m(-3) (7.74), respectively. One percent of the samples exceeded 15 mg m(-3), 6% exceeded 5 mg m(-3), and 48% exceeded 1 mg m(-3). The number of collected pairs is generally appropriate to detect a 35% difference when outliers (negative mass loadings) are removed. Statistical evaluation of the nonsimilar sampler pair results produced a finding of no significant difference between any pairing of sampler type. A practical consideration for sampling in the USA is that the ACCU-CAP™ is similar to the sampler currently used by the Occupational Safety and Health Administration for purposes of demonstrating compliance with its permissible exposure limit for wood dust, which is the same as for Particles Not Otherwise Regulated, also known as inert dust or nuisance dust (Method PV2121).

Show MeSH
Related in: MedlinePlus