Abstract
The conventional QuEChER method (easy, fast, effective, inexpensive, safe and rugged) was used and studied 323 pesticide residues in most common cereals in Iran. Dispersive solid-phase extraction (D-SPE) and clean up by primary-secondary amines (PSA) were used to complement the extraction of acetonitrile-based sample. This study demonstrates the validity of the QuEChERS method in three rice, wheat and corn matrices. The blank samples were spiked with a solution of 300 pesticides at 0.005–0.750 mg kg− 1 level (GC-MS) and 23 pesticides at level 0005–0.2 mg kg− 1 (HPLC-UV). In addition, linearity, recovery, limit of detection, quantification, matrix effects, inter-day and intra-day precision were evaluated. About 70–120% have been recorded to recover most compounds and less than 20 % Precision. The limits of detection (LOD) for pesticide residues was in the range of 0.0025–0.005 for GC-MS method and for pesticides analyzed by HPLC-UV was in the range of 0.003–0.027 mg kg-1.
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