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Journal Article 
Degradation of Polychlorinated Ethanes and Methanes Using Zero-Valent Iron Powder 
Ito, H; Suto, K; Inoue, C; Chida, T 
Mizu Kankyo Gakkaishi / Journal of Japan Society on Water Environment
ISSN: 0916-8958
EISSN: 1881-3690 
The Japan Society of Hydrology & Water Resources 
1 (2003) 
Polychlorinated ethanes and methanes were reductively dechlorinated using iron powder E-200 (supplied by Dowa Iron Powder Co., Ltd.) in the aqueous layer. Time courses of their concentrations were observed and the intermediates and final degradation products were determined quantitatively. The degradation reaction of these compounds showed a pseudo-first-order rate process and the rate constants were calculated. Tetrachloroethanes and tetrachloromethane were easily degraded in the aqueous layer, but dichloroethanes, chloroethane, dichloromethane and chloromethane were only slightly degraded. The rate constants and the reaction products of polychlorinated ethane isomers, that is, 1,1,2,2-tetrachloroethane and 1,1,1,2-tetrachloroethane, or 1,1,1-trichloroethane and 1,1,2- trichloroethane, were significantly different from each other. This denotes that the main degradation pathways of these compounds are different. The possibility of using iron powder for the remediation of soil and groundwater contaminated with chlorinated organic compounds is discussed. 
Water Pollution Treatment; Groundwater Pollution; Chlorophylls; Organic Compounds; Soil; Bioremediation; Chlorinated hydrocarbons; Remediation; ethane; Groundwater; Iron; Pollution control; Chlorine compounds; Degradation; Degradation Products; Methane