Standard Methods 6040D: GC Analysis of Geosmin and 2-MIB on SLB^®-5ms after SPME using 50/30 μm DVB/Carboxen/PDMS Fiber

SPME fiber

2 cm Metal coated with 50/30 μm DVB/Carboxen/PDMS (57914-U)

extraction

headspace, 65 °C (30 min)

desorption process

260 °C for 3 min.

column

SLB-5ms, 30 m x 0.25 mm I.D., 0.25 μm (28471-U)

oven

60 °C (2 min), 8 °C/min to 200 °C

MSD interface

300 °C

scan range

SIM, m/z = 137, 124, 95, 112

carrier gas

helium, 1 mL/min constant

liner

0.75 mm I.D., SPME

sample

20/10 ppt odor compounds in 25 mL water + 25% NaCl