GC Analysis of Phenols on SLB^®-5ms after SPME using 60 μm Carbowax^® Fiber

sample/matrix

Phenols at 25 ppb in 0.1M phosphate buffer, pH 2, with 25% NaCl, 9 mL in 10 mL screw cap vial

SPME fiber

60 μm Carbowax (PEG) (57354-U)

extraction

30 min direct immersion with agitation using CombiPal autosampler

desorption process

(30 min. direct immersion with agitation using CombiPal autosampler)

column

SLB-5ms, 30 m x 0.25 mm I.D., 0.5μm film

oven

50°C(2.0 min) to 160°C @ 10°C/min to 280°C @ 20°C/min

inj. temp.

Splitless/split with 0.75mm ID liner and Merlin Microseal

detector

ITMS m/z=45-275 @ 0.7 μsec per scan, transfer line 310°C

carrier gas

Helium, 1mL/min constant flow, 8.7 psi