Abstract
ABSTRACT In this work a natural and costless adsorbent (Sesamum indicum seeds waste) was used for the accomplishment of a dispersive solid phase extraction procedure followed by dispersive liquid–liquid microextraction for the extraction and preconcentration of some phthalate esters and antioxidants in drinks and liquids prior to their determination by gas chromatography–flame ionisation detection. Under the optimum conditions, limits of detection and quantification were achieved in the ranges of 0.67–1.24 and 2.21–4.11 µg L–1, respectively. The obtained relative standard deviations for the solutions with a concentration of 30 µg L–1 with respect to each analyte were in the ranges of 3.8–5.7% for intra– (n = 6) and 4.7–8.1% for inter–day (n = 4) precisions. The enrichment factors for the analytes were computed to be in the range of 205–235. The efficiency of the method was evaluated by analysing different drinks and liquids as real samples.
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