a multi residue gc-ms method for determination of 12 pesticides in cucumber

cucumber is one of the main vegetables in iranian food basket. a wide range of pesticides are used for crops protection during the cultivation of vegetables such as cucumber due to heavy pest infestation. analysis of pesticide residues in food and other environmental commodities have become essential requirement for consumers, producers, and food quality control authorities. this study was aimed at determination of pesticides residues in cucumber as a main vegetable in iranian food basket. a reliable, rapid and accurate method based on spiked calibration curves and modified quechers sample preparation was developed for determination of 14 pesticide residues in cucumber by gas chromatography-mass spectrometry (gc/ms). the use of spiked calibration standards for constructing the calibration curve substantially reduced adverse matrix-related effects. the recovery of pesticides at 5 concentration levels (n=3) was in the range of 80.6-112.3. the method was proved to be repeatable with rsd lower than 20%. the limits of detection and quantification for all pesticides were