EFFECT OF DRYING PROCESS ON PESTICIDE RESIDUES IN GRAPES

Bu çalışmada üzümlerde bulunan chlorpyrifos, diazinon, dimethoate ve methidathion pestisitlerininkurutma kinetikleri belirlenmiştir. Güneşte ve farklı sıcaklılarda (50°C'de 72 saat, 60°C'de 60 saat,70°C'de 48 saat, 80°C'de 36 saat süre ile) hava akımlı etüvde kurutma işlemi olmak üzere iki farklı kurutmaişlemi uygulanmıştır. Güneşte kurutma işleminde chlorpyrifos, diazinon ve methidathion pestisitlerininyarılanma ömürleri sırasıyla 5.64, 6.42 ve 5.25 gün olarak bulunmuştur. Dimethoate verileri 0., 1. ve 2.derece kinetik uyumu göstermemiştir. Sıcaklık yükseldikçe pestisitlerin parçalanması artmıştır. Dimethoate,diazinon, chlorpyrifos ve methidathionun aktivasyon enerjileri sırasıyla 42.02, 42.18, 42.01 ve 41.08J/mol olarak hesaplanmıştır.

KURUTMA İŞLEMİNİN ÜZÜMLERDE BULUNAN PESTİSİTLER ÜZERİNE ETKİSİ

In this study, drying kinetics of chlorpyrifos, diazinon, dimethoate and methidathion pesticides ongrape 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 48hrs, at 80°C for 36 hrs). During sun drying, half-lives of chlorpyrifos, diazinon and methidathion were5.64, 6.42 and 5.25 days, respectively. The data for dimethoate did not fit 0th,, 1stand 2ndorder kinetics.During oven-drying, the pesticides followed the first order kinetic model. When the temperatureincreased, degradation of pesticides raised. The activation energies of dimethoate, diazinon, chlorpyrifosand methidathion were calculated as 42.02, 42.18, 42.01 and 41.08 J/mol, respectively.

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