Published: Jan 2011
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Micro-vacuum and wipe sampling methods are routinely used to measure surface dust contamination in both occupational and environmental settings. Both methods are subject to variability in their efficiency of dust collection resulting primarily from textural surface characteristics and dust loading. As part of a study to determine contamination levels of asbestos and other World Trade Center related contaminants in the wall cavity of a high-rise office building, paired samples were collected from 15 locations. The surface type of 14 locations was concrete-masonry block; the remaining surface type was a polyvinyl chloride coating. Micro-vacuum wipe pairs were obtained from the same wall component at contiguous locations. A template was used to ensure that equal 100-cm2 areas were consistently sampled. Micro-vacuum and wipe samples were collected and analyzed for asbestos using ASTM Methods D5756 and D6480, respectively. The average surface concentration reported by the micro-vacuum samples was numerically higher than the wipe samples, but the difference was not statistically significant (
asbestos, settled dust, surface sampling, wipe, micro-vacuum
Kominsky, John R.
Vice President, Environmental Quality Management, Inc., Cincinnati, OH
Millette, James R.
Executive Director, MVA, Inc., Duluth, GA