Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1171, Issue 1-2, Pages 1-7Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2007.09.039
Keywords
carbon nanotubes; pseudophase; liquid-liquid extraction; gas chromatography; BTEXS; olive oil
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BTEX-S compounds are widely distributed in the environment and can be present in different foodstuffs, including olive oil. Taking into account the risks of the exposure to these compounds, analytical methods for their determination in different matrices are mandatory. In this paper, the use of surfactant-coated multiwalled carbon nanotubes as additive in liquid-liquid extraction is applied for the determination of single-ring aromatic compounds in olive oil samples. After sample treatment, the aqueous extracts are subsequently analyzed by headspace/gas chromatography/mass spectrometry allowing the determination of BTEX-S within ca. 15 min. Each stage of the proposed LLE/HS/GC/MS configuration involves a selectivity enhancement avoiding the interference of other compounds of the sample matrix. Limits of detection were in the range 0.25 ng mL(-1) (obtained for ethylbenzene) and 0.43 ng mL(-1) (for benzene). The repeatability of the proposed method expressed as RSD varied between 1.9% (styrene) and 3.3 % (benzene) (n = 11). (c) 2007 Elsevier B.V. All rights reserved.
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