Determination of toluene-2,4-diisocyanate in environmental and workplace air by sampling onto Tenax-TA followed by thermal desorption and capillary gas chromatography using flame ionisation and ion-trap detection

摘要: Abstract This work describes a method for the determination of low levels toluene-2,4-diisocyanate (TDI) in workplace air. Perkin-Elmer ATD-400 adsorbent tubes containing 200 mg Tenax-TA (80–100 mesh) were used with low-flow personal sampling pumps. Following period sampling, sealed and returned to laboratory analysis within 24 h. The TDI content was determined by thermal desorption followed capillary column gas chromatography simultaneous FID-ITD detection. analytical run time less than 30 min. Based on nominal 1-1 air sample volume, detection limit as 0.001 μg TDI.