Citation:

Kong, I., J. Hubbard, AND W. Jones. DECHLORINATION ACTIVITY (CROSS-ACCLIMATION) OF FRESHWATER SEDIMENTS ADAPTED TO MONO- AND DI-CHLOROPHENOLS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-94/369 (NTIS PB95124889), 1994.

Description:

The reductive dechlorination of chlorophenols (CPs) in sediment slurries (10% solids) adapted to dechlorinate mono- and di-CPs (DCP) was investigated to define the regiospecificity of the dechlorination reaction. nadapted sediment slurries amended with various ortho-substituted CPs exhibited lag periods ranging from 8 to 12 days before the onset of dechlorination. n contrast, 2- and 3-CP as well as 2,3- and 2,4DCP were dechlorinated without a lag period by sediments adapted to transform 2-CP. echlorination of 4-CP was not observed after incubation for 35 days. daptation to 2-CP, therefore, enhanced the onset of dechlorination of 3-CP and all ortho-substituted CPs tested. echlorination of 2-CP, 3-CP, 2,3-DCP, and 3,4-DCP was also effected without a lag period by sediments adapted to transform 3-CP. ediments adapted to dechlorinate individual DCPs (2,3-, 2,4-, and 3,4-DCP) exhibited dechlorination of 2-CP, 2,3-, 2,4-, and 3,4-DCP without a lag phase. he preference for dechlorination by 2,3- and 2,4-DCP adapted sediments was at the ortho chlorine. 3,4-DCP adapted sediments, which preferentially dechlorinate at the para position of 3,4-DCP, exhibited rapid dechlorination of the ortho and meta chlorines of all mono- and di-CPs tested. nterestingly, dechlorination at the para position was not detected when 4-CP was incubated with 3,4-DCP adapted sediment.

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