Page:NIOSH Manual of Analytical Methods - 2549.pdf/8

 VOLATILE ORGANIC COMPOUNDS (SCREENING): METHOD 2549, Issue 1, dated 15 May 1996 - Page 8 of 8

ATD conditions: Tube desorption temperature: 300 C Tube desorption time: 10 min. Valve/transfer line temperatures: 150 C Focusing trap: Carbopack B/Carboxen 1000, 60/80 mesh, held at 27 C during tube desorption Focusing trap desorption temperature: 300 C Desorption flow: 50-60 mL/min. Inlet split: off Outlet split: 20 mL/min. Helium: 10 PSI GC conditions: DB-1 fused silica capillary column, 30 meter, 1-µm film thickness, 0.25-mm I.D. Temperature program: Initial 35 C for 4 minutes, ramp to 100 C at 8 /min., then ramp to 300 C at 15 /min, hold 1-5 minutes. Run time: 27 min. MSD conditions: Transfer line: 280 C Scan 20-300 amus, EI mode EMV: set at tuning value Solvent delay: 0 min. for field samples; if a solvent-spiked tube is analyzed, a solvent delay may be necessary to prevent MS shutdown caused by excessive pressure.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 5/15/96