Semivolatiles in water

sample/matrix

water spiked with PAHs and phthalates at 50 ppb

SPME fiber

polydimethylsiloxane, 7 μm (57302)

extraction

direct immersion in water, 15 min (rapid stirring)

column

5% Phenyl Polysiloxane, 30 m × 0.25 mm I.D., 0.25 μm (Supelco equivalent, SLB-5ms, 28471-U)

oven

60 °C (3 min), 10 °C/min to 320 °C

inj. temp.

280 °C

detector

MS, scan range m/z = 45-465 at 0.6 sec/scan

carrier gas

helium, 40 cm/sec at 60 °C