LAUSR

BACKGROUND Treatment by ozone water is an emerging technology for the degradation of pesticide residues in vegetables. The ozone dissolved in water generates hydroxyl radicals (·OH), which are highly effective in decomposing organic substances, such as malathion and carbosulfan. RESULTS In this study, it was found that washing pak choi with 2.0 mg/L ozone water for 30 min resulted in 58.3 and 38.2% degradation of the malathion and carbosulfan contents, and the degradation rates of these pure pesticides were 83.0% and 66.3%, respectively. In addition, the "first + first"-order reaction kinetic model was found to predict the trend in the pesticide content during ozone water treatment. Based on investigations by gas chromatography-mass spectrometry combined with the structures of the pesticides, the generated by-products were identified. More specifically, the ozonation-based degradation of carbosulfan generated carbofuran and benzofuranol, while malathion produced succinic acid and phosphoric acid. Although some new harmful compounds were formed during degradation of the parent pesticides, these were only present in trace quantities, and were transient intermediates that eventually disappeared during the reaction. CONCLUSION Our results therefore indicate that ozone water treatment technology for pesticide residue degradation is worthy of popularization and application. This article is protected by copyright. All rights reserved.