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Dechlorination of the Fungicide Chlorothalonil by Zerovalent Iron and Manganese Oxides  

Yun, Jong-Kuk (Division of Applied Biology and Chemistry, Kyungpook National University)
Kim, Tae-Hwa (Division of Applied Biology and Chemistry, Kyungpook National University)
Kim, Jang-Eok (Division of Applied Biology and Chemistry, Kyungpook National University)
Publication Information
The Korean Journal of Pesticide Science / v.12, no.1, 2008 , pp. 43-49 More about this Journal
Abstract
This study is conducted to determine the potential of zerovalent iron (ZVI), pyrolusite and birnessite to remediate water contaminated with chlorothalonil. The degradation rate of chlorothalonil by treatment of ZVI, pyrolusite and birnessite was much higher in low condition of pH. Mixing an aqueous solution of chlorothalonil with 1.0% (w/v) ZVI, pyrolusite and birnessite resulted in 4.7, 13.46 and 21.38 hours degradation half-life of chlorothalonil, respectively. Dechlorination number of chlorothalonil by treaonent of ZVI, pyrolusite and birnessite exhibited 2.85, 1.12 and 1.09, respectively. Degradation products of chlorothalonil by teartment of pyrolusite and birnessite were confirmed as trichloro-1,3-dicyanobenzene and dichloro-1,3-dicyanobenzene which were dechlorinated one and two chlorine atoms from parent chlorothalonil by GC-mass. Degradation products of chlorothalonil by ZVI were identified not only as those by pyrolusite and birnessite but as further reduced chloro-1,3-dicyanobenzene and chlorocyanobenzene.
Keywords
Chlorothalonil; zerovalent iron; pyrolusite; birnessite; dechlorination; D/N value; degradation products;
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Times Cited By KSCI : 2  (Citation Analysis)
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