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Oxidative Degradation of the Herbicide Dicamba Induced by Zerovalent Iron
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 Title & Authors
Oxidative Degradation of the Herbicide Dicamba Induced by Zerovalent Iron
Lee, Kyung-Hwan; Kim, Tae-Hwa; Kim, Jang-Eok;
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 Abstract
Dicamba(3,6-dichloro-2-methoxybenzoic acid) is used to control for pre and post-emergence of annual and perennial broad-leaf weeds. It is very soluble in water and highly mobile, acidic herbicide. So it is easily moved and detected in groundwater. Zerovalent iron(ZVI) has been used for the reductive degradation of certain compounds through amination of nitro-substituted compounds and dechlorination of chloro-substituted compounds. In this study, we investigated the potential of ZVI for the oxidative degradation of dicamba in water. The degradation rate of dicamba by ZVI was more rapidly increased in pH 3.0 than pH 5.0 solution. The degradation percentage of dicamba was increased with increasing amount of ZVI from 0.05% to 1.0%(w/v) and reached above 90% within 3 hours of reaction. As a result of identification by GC-MS after derivatization with diazomethane, we obtained three degradation products of dicamba by ZVI. They were identified 4-hydroxy dicamba or 5-hydroxy dicamba, 4,5-dihydroxy dicamba and 3,6-dichloro-2-methoxyphenol. 4-Hydroxy dicamba or 5-hydroxy dicamba and 4,5-dihydroxy dicamba are hydroxylation products of dicamba. 3,6-dichloro-2-methoxyphenol is hydroxyl group substituted compound instead of carboxyl group in dicamba. We also confirmed the same degradation products of dicamba in the Fenton reaction which is one of oxidation processes using ferric sulfate and hydrogen peroxide. But we could not find out the dechlorinated degradation products of dicamba by ZVI.
 Keywords
Zerovalent Iron;Fenton Reagent;Dicamba;Oxidative Degradation;
 Language
Korean
 Cited by
1.
Zerovalent Iron에 의한 유기염소계 살충제 Endosulfan의 탈염소화,신현수;김택겸;김장억;

한국환경농학회지, 2009. vol.28. 2, pp.202-208 crossref(new window)
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