title: Simultaneous determination of cypermethrin and fenvalerate residues in tomato by gas chromatography and their applications to kinetic studies after field treatment.
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.
authors: International University of Africa, Faculty of Science, Chemistry Department, Khartoum, Sudan.
authors: Mahgoub I
authors: MI
authors: Shinger
authors: Abdalla A
authors: AA
authors: Elbashir
authors: Hassan El-obid
authors: Hel-O
authors: Ahmed
authors: Hassan Y
authors: HY
authors: Aboul-Enein
mesh_terms: D002138:Calibration; D002849:Chromatography, Gas / Q000379:methods*; D007306:Insecticides / Q000032:analysis*; D007700:Kinetics; D057230:Limit of Detection; D018551:Solanum lycopersicum / Q000737:chemistry*; D009570:Nitriles / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D011722:Pyrethrins / Q000032:analysis*; D015203:Reproducibility of Results
chemical_list: D007306:Insecticides; D009570:Nitriles; D010573:Pesticide Residues; D011722:Pyrethrins; C017160:cypermethrin; C017690:fenvalerate