Simultaneous Analysis of Cypermethrin and Fenvalerate Residues in Tomato after Field Treatment by Gas Chromatography

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Date
2015-06-15
Authors
Mahgoub Ibrahim Shinger, Elhassan
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UOFK
Abstract
Abstract In this study simultaneous determination of cypermethrin and fenvalerate residues in tomato fruit (Lycopesicon esculentum) grown in The Sudan, in Elmahas Kutranj eastern Khartoum area was carried out using gas chromatography with electron capture detector . The method was linear in the range of 0.075 – 0.009 mg/ml and 0.75 – 0.037 mg/ml for cypermethrin and fenvalerate respectively. The limit of detection and limit of quantification were found to be 0.003, 0.01 mg/ml and 0.014, 0.047 mg/ml for cypermethrin and fenvalerate, respectively. The recoveries of cypermethrin and fenvalerate spiked to tomato were 97% ± 7.5 and 99.5 % ± 1.8, respectively. The kinetic study of the degradation of both pesticides was performed and the ultimate evaluation of the kinetic data revealed a first order kinetics with respect to their degradation in tomato fruit and an explanation was put forward to account for the results. Formulation of cypermethrin and fenvalerate were analyzed, different solvents were tested. The cleanest extract and the best recoveries were found using cyclohexane as partitioning solvent.
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Simultaneous Analysis of Cypermethrin and Fenvalerate Residues in Tomato after Field Treatment by Gas Chromatography
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