Determination of benzene, toluene, ethylbenzene and xylenes in soils by multiple headspace solid-phase microextraction

  1. Ezquerro, O. 1
  2. Ortiz, G. 1
  3. Pons, B. 1
  4. Tena, M.T. 1
  1. 1 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

Revista:
Journal of Chromatography A

ISSN: 0021-9673

Año de publicación: 2004

Volumen: 1035

Número: 1

Páginas: 17-22

Tipo: Artículo

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DOI: 10.1016/J.CHROMA.2004.02.030 PMID: 15117069 SCOPUS: 2-s2.0-1842556195 WoS: WOS:000220790800003 GOOGLE SCHOLAR

Otras publicaciones en: Journal of Chromatography A

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Resumen

Multiple headspace-solid phase microextraction (MHS-SPME) is a recently developed technique for the quantification of analytes in solid samples that avoids the matrix effect. This method implies several consecutive extractions from the same sample. In this way, the total area corresponding to complete extraction can be directly calculated as the sum of the areas of each individual extraction when the extraction is exhaustive, or through a mathematical equation when it is not exhaustive. In this paper, the quantitative determination of benzene, toluene, ethylbenzene and xylene isomers (BTEX) in a certified soil (RTC-CRM304, LGC Promochem) and in a contaminated soil by multiple HS-SPME coupled to a gas chromatography-flame ionisation detector (GC-FID) is presented. BTEX extraction was carried out using soil suspensions in water at 30°C with a 75μm carboxen-polydimethylsiloxane (CAR-PDMS) fibre and calibration was carried out using aqueous BTEX solutions at 30°C for 30min with the same fibre. BTEX concentration was calculated by interpolating the total peak area found for the soils in the calibration graphs obtained from aqueous solutions. The toluene, ethylbenzene, o-xylene and m,p-xylene concentrations obtained were statistically equal to the certified values. © 2004 Elsevier B.V. All rights reserved.