Insecticide residue analyses in cucumbers sampled from Çanakkale open markets

Abstract

The aim of this study was to investigate four insecticide residues in cucumbers with the aid of QuEChERS 2007.1 method. For method verification assessment, pesticide-free cucumber matrix was spiked with 0.1, 1 and 10 times of MRL for each pesticide. The QuEChERS-LC-MS/MS analytical method revealed that the detection limits of the insecticides were below the MRLs and the overall recovery of method was 97.7%. These figures were within the SANTE recovery limits (60-140%) and the values specified for the repeatability (20%). Cucumbers were collected from six different stands (A-F) at Canakkale open markets for 6 weeks between 23 November and 28 December 2018. Residues of each sampling time and each stand were assessed. Acetamiprid residue of 257g and 236 ug/kg were detected in week 5 from stand B and in week 2 from stand E, respectively. These values are close to MRL (300 ug/kg). Formetanate hydrochloride residue of the week 3 from stand F (36.3 ug/kg) was more than MRL of 10 ug/kg. Pirimiphos methyl and chlorpyrifos residues were not detected in cucumbers. Theoretical maximum daily intake assessment showed that there was no chronic exposure risk for these four pesticides through cucumber consumption.