Field Evaluation of Solvent-Free Sampling with Di-n-butylamine for the Determination of Airborne Monomeric and Oligomeric 1,6-Hexamethylene Diisocyanate
AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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During this study, a field evaluation of a new sampling method using di-n-butylamine for the determination of airborne monomeric and oligomeric 1,6-hexamethylene diisocyanate HDI was performed. The Supelco ASSET EZ4-NCO Dry Sampler was compared to the Omega Specialty Instrument Co. ISO-CHEK sampler. Three specific questions were addressed 1 can HDI oligomers be quantified using HPLC-MS 2 do ASSET and ISO-CHEK samplers collect equivalent HDI monomer oligomer concentrations and 3 what is the relative cost of ASSET samplers verse ISO-CHEK. Side-by-side HDI air sampling was conducted during polyurethane spray painting operations. ASSET samplers were analyzed by HPLC-MS for HDI monomer and oligomers, including biuret and isocyanurate. The ASSET sampler collected significantly higher levels of HDI monomers, indicating ISO-CHEK samplers potentially underestimate true monomer exposures. HDI oligomer results were inconclusive. Finally, the analytical cost for the ASSET sampler was determined to be 50 percent less than ISO-CHEK resulting in a cost savings of 32 K over 5 years.