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Membrane extraction-preconcentration cell coupled on-line to flow-injection and liquid chromatographic systems. Determination of triazines in oils

✍ Scribed by R.Carabias Martínez; E.Rodríguez Gonzalo; E.Hernández Fernández; J.Hernández Méndez

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 847 KB
Volume: 304
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(94)00661-5

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✦ Synopsis

This study was initiated to investigate the potential of on-line liquid-liquid extraction with membrane barriers coupled to liquid chromatographic systems for the fully automated purification and enrichment of complex samples containing very low analyte concentrations. As an illustration, a routine method was developed for the detection of residues of triazine herbicides in oils using a hydrophobic porous membrane. The proposed extraction-preconcentration method with spectrophotometric detection permits the determination of total triazines in samples of corn and sunflower oils. Furthermore, the results obtained on performing the coupling to a liquid chromatographic system show that the procedure permits the automatic extraction, isolation and determination of individual triazines in complex matrices such as corn, sunflower and olive oils.

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