A Comparison of Two Sampling Methods for the Detection of Airborne Methylene Bisphenyl Diisocyanate

The purpose of this study was to determine if there was a significant difference between two readily available sampling methodologies for airborne methylene bisphenyl diisocyanate (MDI), which is an essential precursor in the spray-on truck bed lining industry. Seventy-two personal airborne samples...

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Bibliographic Details
Published in:	Journal of occupational and environmental hygiene Vol. 10; no. 4; pp. 213 - 221
Main Authors:	Schaeffer, Joshua W., Sargent, Layne Marie, Sandfort, Delvin R., Brazile, William J.
Format:	Journal Article
Language:	English
Published:	Philadelphia, PA Taylor & Francis Group 01-04-2013 Taylor & Francis Taylor & Francis LLC
Subjects:	Air Pollutants - analysis Air. Soil. Water. Waste. Feeding Airborne particulates Analysis of Variance Bedding Biological and medical sciences Comparative studies Environment. Living conditions Environmental Monitoring - methods field desorbed Human exposure Isocyanates - analysis Laboratories laboratory desorbed MDI Medical sciences Occupational Exposure - analysis Occupational health Public health. Hygiene Public health. Hygiene-occupational medicine Sampling techniques spray-on truck bed liner United States United States Occupational Safety and Health Administration United States > US Colorado USA, Colorado Work place Methodology Samplings spray-on truck bed liner Concentration measurement laboratory desorbed Health and environment MDI Organic diisocyanate field desorbed Aerosols Detection Sampling Comparative study
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Summary:	The purpose of this study was to determine if there was a significant difference between two readily available sampling methodologies for airborne methylene bisphenyl diisocyanate (MDI), which is an essential precursor in the spray-on truck bed lining industry. Seventy-two personal airborne samples of MDI were collected and analyzed from nine spray-on truck bed liner businesses in northern Colorado. Wide ranges of exposure concentrations were encountered during the spray-on application, including concentrations that exceeded the OSHA permissible exposure limit. The highest airborne MDI concentration measured was 690 ppb. A statistically significant difference between field-desorbed and laboratory-desorbed methods was determined. The field-desorbed sampling methodology yielded consistently higher MDI concentrations than the laboratory-desorbed sampling methodology, which suggests that immediate desorption minimizes isocyanate loss and potential underestimations. Results from the analysis of variance also indicated that different facility factors and environmental conditions within each company, such as the use of ventilation or humidity level, affected the MDI concentrations, indicating the potential for better mitigation of exposures using the hierarchy of controls.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1545-9624 1545-9632
DOI:	10.1080/15459624.2013.766546