A multiple hollow fibre liquid-phase microextraction method for the determination of halogenated solvent residues in olive oil

The present paper describes a method based on the extraction of analytes by multiple hollow fibre liquid-phase microextraction and detection by ion-trap mass spectrometry and electron capture detectors after gas chromatographic separation. The limits of detection are in the range of 0.13–0.67 μg kg−1, five orders of magnitude lower than those reached with the European Commission Official method of analysis, with three orders of magnitude of linear range (from the quantification limits to 400 μg kg−1 for all the analytes) and recoveries in fortified olive oils in the range of 78–104 %. The main advantages of the analytical method are the absence of sample carryover (due to the disposable nature of the membranes), high enrichment factors in the range of 79–488, high throughput and low cost. The repeatability of the analytical method ranged from 8 to 15 % for all the analytes, showing a good performance.This work was supported by the projects P08-FQM-3554 and P09-FQM-4659 from "Consejeria de Innovacion, Ciencia y Empresa" (Andalusian Government) and the project CTM2009-12858-C02-01 from the "Ministerio de Ciencia e Innovacion". J. Manso thanks the Consejeria de Innovacion Ciencia y Empresa for a predoctoral scholarship