Effects of ozone concentration in combination with ultrasound irradiation on the reduction of residual daizinon and chlorpyrifos on tomato (Solanum Lycopersicum L.)

The effect of ultrasound –ozone treatment on the degradation of diazinon and chlorpyrifos in polluted tomatoes was investigated. In this paper, a self-designed system coupling ultrasound (US) with ozone generator was used in order to study the effects of the combination of ultrasound and ozone treatment on the removal of residual diazinon and chloropyrifos on tomatoes. The samples were exposed to certain concentrations of ozone (۱ and ۲ ppm) and ultrasound radiations (۴۰ and ۷۰ kHz) and with various exposure times (۵, ۱۷.۵, ۳۰ minutes) in order to evaluate the combined effects of ozone concentrations and ultrasound frequencies on the degradation of diazinon and chlorpyrifos. Then, the remained-pesticide residues concentrations were determined with High Performance Liquid Chromatography (HPLC). Results indicated that after ۳۰ min, the most removal of diazinon and chlorpyrifos residues were ۸۸.۶% and ۹۲%, respectively at the frequency of ۷۰ kHz and the ozone exposure of ۲ ppm. Ultrasonic irradiation in combined with ozone had a synergistic effect in reducing residual diazinon and chlorpyrifos with the highest rate occurring for ۳۰ min. The present study showed that ultrasonic irradiation and ozone exposure could be applied to reduce the residual diazinon and chlorpyrifos in order to achieve the standards for pesticide residue limits.

کلیدواژه ها:

Pesticide ، Ozone ، Ultrasound ، Diazinon ، Chlorpyrifos ، Tomato