تعيين باقيمانده حشره كش پريميفوس متيل در گندم انباري به روش نشانداركردن با كربن 14

Determination of Pirimiphos-Methyl Residue in Stored Wheat by 14C-Pirimiphos-Methyl Labeling

The 14C- labeled Pirimiphos-methyl with specific activity of 53.39 uCi/mg in combination with Non-labeled and pure pirimiphos-methyl were used on stored wheat with the concentration of 8.88 mg/kg. After treatment, the grains were stored in glass-containers with tight caps for 380 days at 5-30°C in such a climate as Karaj. Surface and extractable penetrated residues were measured at specific times [3].The14C-labelled Pirimiphos-methyl residue in stored-wheat reached to %82.02 of the applied dose after 380 days. During this period the surface residue decreased from %63 to %33, but the extractable residue increased from %32 to %49. This experiment shows that Pirimiphos-methyl residue penetrates from the surface to the body of the grain as time goes by. It was also indicated that Pirimiphos-methyl is rather persistent. Due to the fact that the maximum residue limit in stored grains is 10 mg/kg [8], therefore , higher dose application above this limit may leave non-tolerable residue amount in stored-wheat.