Abstract
Summary The aim of this study was to evaluate the usefulness of the QuEChERS (quick, easy, cheap, effective, rugged and safe) sample preparation technique in conjunction with gas chromatography with electron capture and nitrogen phosphorus detection (GC‐ECD/NPD – gas chromatography with electron capture and nitrogen phosphorus detection) for the analysis of pesticide residues in peppermint. Validation experiments were carried out for 14 compounds at two spiking levels of 0.01 and 0.1 mg/kg. The obtained results were highly satisfactory and compliant with the criteria recommended by the European Union document SANCO/10684/2009 (recently superseded by SANCO/12684/2011). The compounds showed recoveries in the range of 70–120% and repeatability (relative standard deviation) equal to or less then 20%. The QuEChERS allowed to obtain high quality pesticide residue results with a reduced number of analytical steps and a lower glassware and solvent consumption compared with used previously method.
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