VJOLLCA VLADI1*, FATOS HARIZAJ2, VALDETE VORPSI2, MAGDALENA CARA3
1Food Safety and Veterinary Institute. Tirana, Albania.
2Faculty of Agriculture and Environment, AUT, Department of Plant Production, Tirana, Albania
3Faculty of Agriculture and Environment, AUT, Department of Plant Protection, Tirana, Albania
*Corresponding authore-mail: firstname.lastname@example.org
A liquid chromatographic (LC) method using UV detection was used to study the degradation of imidacloprid in tomatoes grown in greenhouses. A liquid-liquid extraction with acetonitrile/methanol (60/40, v/v) and a cleanup step with Florisil were combined with LC to isolate, recover, and quantities the pesticide. Average recoveries obtained at spike levels of 0.03 and 0.40 mg/kg were 93.2-94.7%. Determination limits were 0.012 mg/kg. The experiment was conducted in the greenhouses located in Durres. Treatment was performed using Confidor20 EC (Imidacloprid), an insecticide with a systemic action. The aim was to confirm the residue of Imidacloprid in tomatoes and to find the decline curve after the last application in minimal and maximal concentration, 0.25% and 0.5% respectively. Samples of tomato fruits were taken in an interval of 1, 3, 5, 7 days after the application. The degradation of Imidacloprid, in maximal concentration exceeds the allowed limit of 7 days, this is day of PHI, thus influencing harvest and marketing.
Key words:Imidacloprid, Greenhouse Tomato, Pesticide Residues .