GAS-CHROMATOGRAPHY OF 4,4'-DIPHENYLMETHANE DIISOCYANATE IN THE WORKPLACE ATMOSPHERE

Citation
Gm. Deril et al., GAS-CHROMATOGRAPHY OF 4,4'-DIPHENYLMETHANE DIISOCYANATE IN THE WORKPLACE ATMOSPHERE, Journal of chromatography, 718(1), 1995, pp. 141-146
Citations number
24
Categorie Soggetti
Chemistry Analytical","Biochemical Research Methods
Journal title
Volume
718
Issue
1
Year of publication
1995
Pages
141 - 146
Database
ISI
SICI code
Abstract
A sensitive gas chromatographic procedure for the determination of 4,4 '-diphenylmethane diisocyanate concentration in air is described. Trap s containing 20-40-mesh silica gel coated with phosphoric acid are use d. After the aspiration of the air, the silica gel is eluted with sodi um hydroxide in methanol. The amine formed is then separated with a ga s chromatograph and measured with a nitrogen-phosphorus detector. This can be performed in 7 min. Virtually no breakthrough occurs if an air concentration of up to 128 nmol in 20 1 is sampled. The detection lim it based on a 20-1 air sample is 0.7 mu g/m(3). Complete analysis requ ires about 30 min. The method was used to determine the concentration of 4,4'-diphenylmethane diisocyanate in working environments during sp raying operations.