Comparison of different fibers for the solid-phase microextraction of phthalate esters from water

Solid-phase microextraction (SPME) coupled to gas chromatography–mass spectrometry (GC–MS) has been applied to determine six phthalate esters and one adipate ester in water. The SPME parameters were optimized for several commercially available fibers. A 65-μm polydimethylsiloxane-divinylbenzene (PDMS-DVB) was the fiber selected and was applied to analysis of water from the Ebro river and the industrial port of Tarragona. The studied compounds were found at concentrations ranging from 0.4 μg l−1 for di-n-butyl phthalate ester (DnBP) to 3.2 μg l−1 for bis(2-ethylhexyl) phthalate ester (DEHP). The linear range for real samples was from 0.1 to 10 μg l−1 for most phthalates, and the limits of detection of the method were between 3 and 30 ng l−1. Repeatability and reproducibility between days (n=5) for 1 μg l−1 samples were below 13 and 18%, respectively.