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Updated: May 27, 2026

Determination of 45 Pesticides in Avocado Varieties by the QuEChERS Method and Gas Chromatography-Tandem Mass Spectrometry
Published on: December 8, 2023
Multi-class pesticide analysis in human hair by gas chromatography tandem (triple quadrupole) mass spectrometry with
Guillaume Salquèbre1, Claude Schummer, Maurice Millet
1Laboratory of Analytical Human Biomonitoring-CRP-Santé, Université du Luxembourg, Luxembourg, Luxembourg.
Abstract:
A method for the simultaneous detection and quantification of 22 pesticides from different chemical classes was developed using solid-phase microextraction (SPME) and gas chromatography tandem (triple quadrupole) mass spectrometry. Pesticides were extracted from 50mg of pulverized hair with acetonitrile. The extract was submitted to two successive steps of direct immersion-SPME at 30°C and 90°C or to a liquid injection without SPME in order to obtain optimized conditions for each of the 22 analytes investigated. Validation parameters were significantly influenced by both the injection mode (SPME vs liquid injection) and the temperature of SPME. Limits of quantification ranged from 0.05 pg mg(-1) for trifluralin to 10 pg mg(-1) for pentachlorophenol. The application of the validated method to the analysis of samples collected from non-occupationally exposed volunteers demonstrated the presence of pesticides in all the samples tested. Altogether, 13 different analytes were detected at concentration above the limit of quantification.
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