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

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...

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Bibliographic Details
Published in:Analytica chimica acta 1995-04, Vol.304 (3), p.323-332
Main Authors: Martínez, R.Carabias, Gonzalo, E.Rodríguez, Fernández, E.Hernández, Méndez, J.Hernández
Format: Article
Language:English
Subjects:
Biological and medical sciences
Flow injection
Food industries
Fundamental and applied biological sciences. Psychology
General aspects
Liquid chromatography
Membrane extraction
Methods of analysis, processing and quality control, regulation, standards
Oils
Triazines
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Summary: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.
ISSN:0003-2670
1873-4324
DOI:10.1016/0003-2670(94)00661-5