期刊
CHEMOSPHERE
卷 76, 期 9, 页码 1308-1314出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2009.04.060
关键词
Ozone; Methyl parathion; Parathion; Diazinon; Intermediate
资金
- The Hong Kong Polytechnic University Sun Yat-sen University joint Research Grant
- PolyU Research Grant [A-PD94]
In the present study, organophosphorus pesticides (OPs) (diazinon, methyl parathion, and parathion) were oxidized by bubbling ozone into a glass reactor. OP residues were detected using HPLC and ozonation intermediates were identified using GC-MS. The degradation of OP's followed pseudo-first-order kinetics through direct ozone oxidation and indirect hydroxyl radical oxidation. Diazinon, based on its relatively higher degradation constant, was easily degraded by ozonation. Increasing the pH of the solution accelerated diazinon degradation, but little effect was observed for methyl parathion or parathion. Diazoxon, methyl paraoxon and paraoxon were identified as ozonation intermediates of diazinon, methyl parathion and parathion, respectively. The ozonation of the P=S group results in the formation of oxon intermediates, which suggests that ON with this group would be degraded in a similar manner to that seen for the ON tested in this study. Diazoxon was completely decomposed by ozonation in 30 min, while trace methyl paraoxon and paraoxon accumulated to different amounts when the solution pH was varied. The presence of oxon intermediates should be noted in OP removal by ozonation. (C) 2009 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据