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Analysis of Pesticide Residues in Apple by GC/MS using Agilent SampliQ QuEChERS Kits for Preinjection Cleanup

Abstract: The QuEChERS method, which stands for Quick, Easy, Cheap, Effective, Rugged and Safe was developed in 2003 by scientists at the USDA. This method was created to easily clean up and prepare food samples for multi-class, multi-residue pesticide analysis. This application note describes the use of the original, non-buffered QuEChERS method to prepare apple samples for residue analysis by gas chromatography/ mass spectrometry (GC/MS). Fifteen pesticides of different classes were studied. The experiments were done using Agilent QuEChERS extraction kits for 10-g samples and dispersive kits for 1-mL sample volumes. The analysis was done by GC/MS using selective ion monitoring (SIM) mode. The limit of quantitation for all the pesticides studied was 10 ng/g in apple using this method. At 200 ng/g, the recoveries ranged from 89% to 102%, and at 10 ng/g, the recoveries ranged from 72% to103%. The relative standard deviations associated with these recoveries were less than 11% in all cases.

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