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
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.