Application of a polysiloxane-based extraction method combined with column liquid chromatography to determine polycyclic aromatic hydrocarbons in ... [An article from: Analytica Chimica Acta]

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Description:
Silicone rods with a diameter of 1mm and 10mm long were used to extract polycyclic aromatic hydrocarbons (PAHs) from water samples and for the rapid screening of highly contaminated waste material. The rods were placed in a 15ml glass vial for the extraction of the analytes, which involved shaking (300min^-^1) the sample for 3h. After extraction the rods were placed into 250@ml inserts of 2ml vials filled with 100@ml of an acetonitrile-water mixture (4:1) and desorption was performed with sonication for 10min. Then the PAHs were determined using LC and fluorescence detection. Recoveries of the rod extraction ranged between 62 and 97% and the detection limits were between 0.1 and 1.2ngl^-^1. These results are comparable with those of stir bar sorptive extraction (SBSE). Although the rods are reusable, their low price means they can be discarded if contaminated, eliminating the need for expensive cleaning. One disadvantage compared to SBSE is the longer extraction time needed to reach equilibrium.