In order to investigate dissipation behaviour of fenitrothion, dimethoate, chlorpyrifos and pirimiphos-ethyl during infusion process, pesticide-free dried thyme and stinging nettle leaves were spiked with the pesticides. Infusions were prepared according to the usual process of infusion preparation. The effect of infusion process on the transfer of the pesticides from the spiked herbs leaves into brew was examined at intervals of 5, 10, 15 and 20 min. Residues were determined using gas chromatograph equipped with a flame ionization detector. The decrease in pesticide levels during infusion was found to be statistically significant (P < 0.05). Transfer of residues decreased considerably with infusion time. The carryover of the residues of dimethoate, which has the highest water solubility, into the infusions was the greatest. Satisfactory relationships were found between water solubility (W s ) and partition coefficient (K ow ) of the pesticides with the transfer of pesticides to brewed teas.
In this study, drying kinetics of chlorpyrifos, diazinon, dimethoate and methidathion pesticides on grape samples were determined. Grapes were dried under two conditions: by sunlight (for 21 days) and in a ventilated oven at different temperatures (at 50 °C for 72 hrs, at 60 °C for 60 hrs, at 70 °C for 48 hrs, at 80°C for 36 hrs). During sun drying, half-lives of chlorpyrifos, diazinon and methidathion were 5.64, 6.42 and 5.25 days, respectively. The data for dimethoate did not fit 0 th ,, 1 st and 2 nd order kinetics. During oven-drying, the pesticides followed the first order kinetic model. When the temperature increased, degradation of pesticides raised.
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