摘要：This study was conducted to determine the effect of ozonation at concentrations of 0.4 ppm on cypermethrin and chlorpyrifos pesticides residues reduction in spiked tomato fruits at different concentrations. The pesticide residues were extracted from homogenized tomato fruits with acetonitrile using QuEChERS method and the determination was carried out on GC-ECD using splitless injector and HP5 capillary column. The maximum reduction percentages of chlorpyrifos pesticide after 30 min exposure to ozone at concentration of 0.4 ppm of spiked tomato fruits with 0.05, 0.1, 0.5, 1.0 and 5.0 ppm were 97.9, 97.9, 95.3, 94.9 and 95.9%, respectively, while for cypermethrin pesticide at similar concentrations and conditions were 83.3, 82.8, 83.8, 84.9 and 87.3%, respectively. Results showed that chlorpyrifos pesticide degradation is more sensitive to ozonation than cypermethrin residues. The effect of ozonation at concentration of 0.4 ppm on degradation of chlorpyrifos and cypermethrin residues is time dependent, whenever the exposure time increased, the degradation of chlorpyrifos and cypermethrin residues also increased.
