Determination of pesticides phosalone and diazinon in pistachio using ion mobility spectrometry

Abstract

Diazinon and phosalone are two pesticides widely used in agriculture and gardening. Because the residues of these pesticides in fruits, vegetable, and environment are dangerous for human and domestic animal health, their determination in different samples is of importance. In this work, ion mobility spectrometry in positive mode was used for determination of residues of diazinon and phosalone in pistachio. The calibration curves for these pesticides were obtained using standard solutions. The detection limits of diazinon and phosalone measured by ion mobility were 0.1 and 0.5 ppm, respectively. The pistachio samples were prepared from market and a garden near Qazvin (Iran). The measurements showed that there is no detectable phosalone in the samples, however, diazinon was detected in the pistachio of the garden. The diazinon residues in the opened- and closed-shell pistachios one day after spraying were 0.071 and 0.008 mg/kg, respectively. After 5 days, the diazinon residues reach 0.004 and 0.006 mg/kg, respectively.