Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/18711
Title: Efficacy evaluation of low-concentration of ozonated water in removal of residual diazinon, parathion, methyl-parathion and cypermethrin on vegetable
Authors: Wu, JG
Luan, TG
Lan, CY
Lo, WH 
Chan, GYS 
Keywords: Cypermethrin
Diazinon
Methyl-parathion
Ozonated water
Parathion
Pesticide
Vegetable
Issue Date: 2007
Publisher: Elsevier Sci Ltd
Source: Journal of food engineering, 2007, v. 79, no. 3, p. 803-809 How to cite?
Journal: Journal of Food Engineering 
Abstract: The present study investigated the degradation of four pesticides by low-concentration of dissolved ozone in order to establish the effect of operational parameters. The results indicated that dissolved ozone (initial concentration of 1.4 mg/l) was effective to oxidize 60-99% of 0.1 mg/l aqueous diazinon, parathion, methyl-parathion and cypermethrin shortly within 30 min. The feasibilities of applying low dissolved levels of ozone in water (1.4-2.0 mg/l) to remove the target pesticides residing on vegetable surface (Brassica rapa) were studied. Ozonated water was mostly effective in cypermethrin removal (>60%). The efficacy highly depended on the dissolved ozone levels. Higher temperature enhanced the efficacy in pesticide removal; however, the solubility of ozone in water is inversely proportional to temperature. The maximal efficacy for diazinon removal was detected to be at 15-20 °C. Major limitation factors for residual pesticide removal are temperature, concentration of ozone gas applied and concentration of dissolved ozone established.
URI: http://hdl.handle.net/10397/18711
DOI: 10.1016/j.jfoodeng.2006.02.044
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