Degradation of cypermethrin, malathion and dichlorovos in water and on tea leaves with O₃/UV/TiO₂ treatment
2012
Lin, Li | Xie, Minnan | Liang, Yongmei | He, Yingqian | Sing Chan, Gilbert Yuk | Luan, Tiangang
The main aims of the present study were to study the efficacy and mechanisms of removing three pesticides (cypermethrin, malathion, dichlorovos) from fresh tea leaves and water by O₃/UV/TiO₂ treatment, and to explore the optimal conditions for the removal. The results indicated that the removal rates of pesticides on tea leaves were not affected by water pH, whereas the removal rates of pesticides from water were affected. Eliminating rates of cypermethrin and malathion from tea leaves by O₃/UV/TiO₂ were significantly higher than that by water rinsing treatment (PÂ <Â 0.05). The O₃/UV/TiO₂ treatment resulted in an 80% removal rate for cypermethrin (initial residue content 5.8Â mg/kg) and 78% for malathion (initial residue content 2.2Â mg/kg). It could be concluded that O₃/UV/TiO₂ treatment was especially effective for the removal of insoluble pesticides (e.g. cypermethrin) from tea leaves, with a 250% enhancement over the water rinsing treatment.
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