Abstract
The technique of stir bar sorptive extraction is used for the determination of polycyclic aromatic hydrocarbons (PAH) in aqueous samples. The PAHs are extracted with 10-mm stir bars (Gerstel Twister) coated with 0.5 mm polydimethylsiloxane and analyzed with a gas chromatography–mass spectrometry system. The influence of methanol and hyamine addition to the samples for preventing wall effects is investigated at 100 ng/l. The results indicate improved sensitivity using hyamine addition to the samples. The optimal extraction time was found to be between 3 and 4 h. The reproducibility of the method, as determined by nine replicate measurements, is between 5 and 15% at 10 ng/l and between 3 and 9% at 50 ng/l. Carry-over, which was evaluated at 500 ng/l by desorbing the same Twister three times, seems to be negligible for most of the compounds. In worst cases, carry-over of up to 7% was found for indeno[1,2,3]pyrene, dibenz[ a, h]anthracene, and benzo[ g, h, i]perylene. The technique shows excellent linearities for 5 point calibrations. Detection limits are between 0.1 and 2 ng/l.
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