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

sample/matrix

Triazine herbicides at 2 ppb in 0.1M phosphate buffer, pH 7, 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 program

desorption process

2 min at 250°C, splitless for 0.75 min then opened

column

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

oven

60°C(1 min) to 150°C @ 25°C/min to 230°C @ 5°C/min (0.5 min)

inj. temp.

Splitless/split with 0.75mm ID liner and Merlin Microseal

detector

ITMS m/z=150-250 @ 0.5 μsec per scan, transfer line 310°C

carrier gas

Helium, 1mL/min constant flow