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  • Title: Simultaneous determination of cypermethrin and fenvalerate residues in tomato by gas chromatography and their applications to kinetic studies after field treatment.
    Author: Shinger MI, Elbashir AA, Ahmed Hel-O, Aboul-Enein HY.
    Journal: Biomed Chromatogr; 2012 May; 26(5):589-93. PubMed ID: 21882207.
    Abstract:
    In this study simultaneous determination of cypermethrin and fenvalerate residues in tomato fruit (Lycopesicon esculentum) grown in Khartoum, Sudan, was carried out using gas chromatography with electron capture detector (GC-ECD). The method was linear in the ranges of 0.075-0.009 and 0.75-0.037 mg/mL for cypermethrin and fenvalerate, respectively. The limits of detection and quantification were found to be 0.003 and 0.01 mg/mL and 0.014, 0. 047 mg/mL for cypermethrin and fenvalerate, respectively. The recoveries of cypermethrin and fenvalerate spiked in 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 the tomato fruit; an explanation was put forward to account for the results.
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