NDLI: Evaluation of the NIOSH draft method 5525 for determination of the total reactive isocyanate group (TRIG) for aliphatic isocyanates in autobody repair shops

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Journal of Environmental Monitoring Vol - 4 Issue - 2

Journal of Environmental Monitoring Vol - 4 Issue - 1

Journal of Environmental Monitoring Vol -3

Journal of Environmental Monitoring Vol -2

Evaluation of the NIOSH draft method 5525 for determination of the total reactive isocyanate group (TRIG) for aliphatic isocyanates in autobody repair shops

Content Provider	Royal Society of Chemistry (RSC)
Author	Bello, D. Woskie, S. R. Streicher, R. P.
Copyright Year	2002
Abstract	This paper evaluates the performance of the NIOSH draft method 5525 for analysis of monomeric and TRIG aliphatic isocyanates in autobody repair shops. It was found that an optimized pH gradient enhanced noticeably the resolution and, therefore, identification of aliphatic isocyanates. Samples proved to be very stable for at least a year when stored at −13 °C in the freezer, and no major stability problems were found for the MAP reagent. The detector response factor RSD for selected MAP ureas was 40% in the fluorescence (FLD), 3% in the UV at 254 nm (UV254), and 1% in the UV at 370 nm (UV370). The mean FLD/UV254 and UV254/UV370 detector response ratios of standards were 31.7 (RSD = 37.8) and 17.1 (RSD = 5.4), respectively. The FLD/UV254 ratio in bulks varied from 0.41 to 1.97 times the HDI monomer ratio. The mean UV254/UV370 ratio in bulks was 16.1 (range 14.1 to 19.2, N = 38). Mean (range) recovery of 92 (91.2–93.2)% was found for the N3300 (isocyanurate) spiked on 25 mm quartz fiber filters in the range 0.07 to 2.2 µg NCO ml−1. Mean (range) recovery for impingers was 100.7 (91.7–106.0)% for N3300 in the concentration range of 0.018 to 2.5 µg NCO ml−1 and 81.0 (76.1–89.1)% for IPDI in the concentration range of 0.016 to 1.87 µg NCO ml−1. Analytical method precision was 3.4% and mean bias 7.4% (range = 0–25%). The NIOSH draft method 5525 provides flexibility, enhanced sensitivity and specificity, powerful resolution, and very small compound-to-compound variability in the UV254, resulting in a more reliable identification and quantification of aliphatic isocyanates.
Starting Page	351
Ending Page	360
Page Count	10
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	4
Issue Number	3
Journal	Journal of Environmental Monitoring
DOI	10.1039/b110613a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	NIOSH NCO National Institute for Occupational Safety and Health NBA draft Aliphatic compound PH Reagent Fluorescence Monomer Cyanuric acid
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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