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Field comparison of air sampling methods for monomeric and polymeric 1,6-hexamethylene diisocyanate.

Authors
Thomasen-JM; Fent-KW; Reeb-Whitaker-C; Whittaker-SG; Nylander-French-LA
Source
J Occup Environ Hyg 2011 Mar; 8(3):161-178
NIOSHTIC No.
20038608
Abstract
This study was to critically compared 13 different air samplers for their ability to monitor air exposures to monomeric and polymeric 1,6-hexamethylene diisocyanate (HDI) in the automotive refinishing industry. Using both fast- and slow-drying clearcoat, we tested the following types of samplers: single- and dual-stage 37-mm polypropylene (PP) and polystyrene (PS) samplers (open- and closed-face), IOM (with plastic and stainless steel inserts), OSHA42, IsoChek, and WA-DOSH samplers. Midget impingers with frit were used as reference samplers. We observed the PP, PS, and IOM samplers to measure greater levels of HDI monomer and biuret when a fast-drying clearcoat was applied compared with a slow-drying clearcoat. When a slow-drying clearcoat was applied, the open-face PP and PS samplers measured significantly more monomeric and polymeric HDI (2-fold; p < 0.003) than the closed-face PP and PS samplers. We determined that significantly more monomeric and polymeric HDI were measured by impingers (1.3-1.9-fold) compared with single-stage PP/PS (N = 59), dual-stage PP/PS (N = 59), or IOM (N = 24) samplers. However, when stratified by cassette characteristics, the open-face single-stage PP and PS samplers performed equally to the impingers for HDI monomer when a fast-drying clearcoat was applied, and for all analytes when a slow-drying clearcoat was applied. Significantly higher HDI monomer concentrations (1.2-3.1-fold; p = 0.001) were measured with OSHA42 compared with the impinger. The IsoChek did not detect HDI monomer, and of the three samplers analyzed by laboratories other than UNC (i.e., OSHA42, IsoChek, and WA-DOSH), the WA-DOSH was in the best agreement with the impingers. The influence of clearcoat drying time on the sampler's ability to measure monomeric and polymeric HDI emphasizes the importance of the speciation of diisocyanates in chemical analysis and the careful consideration for the selection of the air sampler to be used when measuring exposures during automotive spray painting.
Keywords
Air-samplers; Air-monitoring; Air-quality-monitoring; Monitoring-systems; Monomers; Polymers; Cyanates; Automotive-industry; Propylenes; Styrenes; Impingers; Analytical-instruments; Spray-painting; Measurement-equipment; Analytical-chemistry; Exposure-assessment; Author Keywords: 1,6-hexamethylene diisocyanate (HDI); air sampling; inhalation exposure; polyisocyanate; sampling method
Contact
Leena A. Nylander-French, Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill, CB #7431, Rosenau Hall, Chapel Hill, NC 27599-7431, USA
CODEN
JOEHA2
CAS No.
822-06-0; 108-19-0
Publication Date
20110301
Document Type
Journal Article
Email Address
leena french@unc.edu
Funding Type
Grant
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T42-OH-008673
Issue of Publication
3
ISSN
1545-9624
Source Name
Journal of Occupational and Environmental Hygiene
State
NC; WA
Performing Organization
University of North Carolina, Chapel Hill, North Carolina
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