The reductive dechlorination of six dichlorophenol (DCP) isomers was examined in a fresh water sediment collected from Kasumigaura lake in Japan. Short lag periods were observed for all the DCPs examined varying between 1–20 days. The relative degradation rates of six DCP isomers were 2,5- > 2,4- > 2,3- > 2,6- > 3,5- > 3,4- DCP with half- lives of ranging between 7-39 days. The specificity of chlorine removal indicated a preference for ortho-chlorine removal for dichlorophenol isomers substituted at ortho position, while meta and meta/para chlorine removal was observed for 3,5- and 3,4-DCP, respectively. Intermediate products of transformation, 2-, 3- and 4-MCP and phenol were identified with a combination of gas chromatography and mass spectrometry using standards.

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