Gasoline in arson samples

SPME fiber

polydimethylsiloxane phase fiber, 100 μm headspace sampling (20 min) 10 sec desorption (splitless mode) (57300-U)

column

100% methyl polysiloxane, 30 m × 0.25 mm I.D., 0.25 μm (Supelco equivalent, Equity-1, 28046-U)

oven

35 °C (2 min) to 220 °C at 10 °C/min, hold 2 min, to 300 °C at 30 °C/min, hold 5 min

inj. temp.

splitless (closed 3 min), 220 °C (2 mm I.D. injector liner)

detector

FID, 300 °C

carrier gas

helium, 1 mL/min (split 50:1)