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Determination of Organophosphorus and Triazine Pesticides in Olive Oil by On-Line Coupling Reversed-Phase Liquid Chromatography/Gas Chromatography with Nitrogen-Phosphorus Detection and an Automated Through-Oven Transfer Adsorption-Desorption Interface

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A method is described for the simultaneous determination of organophosphorus and triazine pesticides in olive oil, whereby reversed-phase liquid chromatography (LC) is coupled to gas chromatography by means of an automated through-oven transfer adsorption-desorption (TOTAD) interface. The olive oil needs to be filtered only before it is loaded into the liquid chromatograph, where preseparation of the pesticide residues from the other olive oil components is carried out by using methanol–water as the eluant. The LC fraction containing the pesticides is automatically transferred to the gas chromatograph by using the TOTAD interface, which almost totally eliminates the solvent, so that water-sensitive detectors such as the nitrogen-phosphorus detector can be used. Detection limits range from 0.07 to 0.38 μg/L for organophosphorus pesticides and from 6.0 to 7.0 μg/L for triazines. The results were compared with those obtained by flame ionization detection.

Document Type: Research Article

Affiliations: 1: Universidad de Castilla-La Mancha, Escuela Técnica Superior de Ingenieros Agrónomos, Campus Universitario s/n, 02071 Albacete, Spain. 2: Universidad de Castilla-La Mancha, Escuela Universitaria de Magisterio de Albacete, Departamento de Química-Física, Campus Universitario s/n, 02071 Albacete, Spain.

Publication date: 2005-07-01

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  • The Journal of AOAC INTERNATIONAL publishes refereed papers and reviews in the fields of chemical, biological and toxicological analytical chemistry for the purpose of showcasing the most precise, accurate and sensitive methods for analysis of foods, food additives, supplements and contaminants, cosmetics, drugs, toxins, hazardous substances, pesticides, feeds, fertilizers and the environment available at that point in time. The scope of the Journal includes unpublished original research describing new analytical methods, techniques and applications; improved approaches to sampling, both in the field and the laboratory; better methods of preparing samples for analysis; collaborative studies substantiating the performance of a given method; statistical techniques for evaluating data. The Journal will also publish other articles of general interest to its audience, e.g., technical communications; cautionary notes; comments on techniques, apparatus, and reagents.
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