Explosives in water

sample/matrix

50 ng/mL each explosive in water

SPME fiber

polydimethylsiloxane/divinylbenzene, 65 μm (57310-U)

extraction

immersion, 30 min

desorption process

5 min, 250 °C

column

14% cyanopropylphenyl polysiloxane, 30 m × 0.25 mm I.D., 0.25 μm (Supelco equivalent, Equity-1701, 28372-U)

oven

95 °C (3 min) to 182 °C at 8 °C/min (4 min) to 250 °C at 8 °C/min (6 min)

inj. temp.

split/splitless, 180 °C

detector

ECD, 250 °C

carrier gas

helium