Poster ID:1142421234

Detrmination of Light Isocyanates Produced by Thermal Degradation of Polyurethanes using LC/MS

click image to enlarge Detrmination of Light Isocyanates Produced by Thermal Degradation of Polyurethanes using LC/MS


Author:John White

Abstract/Description:
MDHS 25/3 was developed for the analysis of the most common di-isocyanates and as routinely used will probably not be able to determine the "light" NCO. The work presented here describes the extension of MDHS 25/3 to include the use of triple quadrupole mass spectro-metric detection (MS) so enabling the determination of the "light" isocyanates. Acceptable recoveries and limits of detection (LOD) were obtained for samplers spiked with 11, derivat-ized, mono- and di-isocyanates using a combined selected ion monitoring mode (SIM) and multiple reaction mode (MRM) screening MS method (recoveries 89 114%, LOD 0.4 46 ng NCO/ml depending on NCO). Of particular interest are isocyanic acid, methyl NCO and ethyl NCO and an MRM method was developed specifi-cally for these compounds (recoveries 93 108%, LOD ~ 3 ng NCO/ml). These methods were then applied to samples obtained from the pyrolysis of various polyurethane products (foams, paints etc) and spot-welding of painted car parts and examples of this work are given.

Poster presented at:
3rd National Meeting on Environmental Mass Spectrometry - 2006


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