Interrupted-sweep voltammetry for the identification of polychlorinated biphenyls and naphthalenes

Farwell, S. O.; Beland, F. A.; Geer, Richard D.

doi:10.1021/ac60356a043

Cited by 33 publications

(18 citation statements)

References 19 publications

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“…Besides the assumed presence of several microbial populations (or enzymes) with distinct dechlorination activities, the microbial dechlorination activities are also influenced by the reduction potential of a PCB congener, i.e., the tendency of a PCB congener to act as an electron acceptor to release the chloro substituent as a chloride anion, and by its steric conformation (11,30). The reduction potential of PCBs increases with increasing chlorine numbers (16,26). Williams the dechlorination of 234-CB, 235-CB, 236-CB, 245-CB, 246-CB, and 345-CB (90 g/ml) in slurries of Hudson River, Silver Lake (Pittsfield, Mass.…”

Section: Discussionmentioning

confidence: 99%

Two anaerobic polychlorinated biphenyl-dehalogenating enrichments that exhibit different para-dechlorination specificities

Wiegel

1997

Appl Environ Microbiol

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Two anaerobic polychlorinated biphenyl (PCB)-dechlorinating enrichments with distinct substrate specificities were obtained: a 2,3,4,6-tetrachlorobiphenyl (2346-CB) para-dechlorinating enrichment derived from Aroclor 1260-contaminated Woods Pond (Lenox, Mass.) sediment and a 2,4,6-trichlorobiphenyl (246-CB) unflanked para-dechlorinating enrichment derived from PCB-free Sandy Creek Nature Center (Athens, Ga.) sediment. The enrichments have been successfully transferred to autoclaved soil slurries over 20 times by using 300 to 350 M 2346-CB or 246-CB. Both enrichments required soil for successful transfer of dechlorination activity. The 2346-CB enrichment para dehalogenated, in the absence or presence of 2346-CB, only 4 of 25 tested para halogen-containing congeners: 234-CB, 2345-CB, 2346-CB, and 2,4,6-tribromobiphenyl (246-BrB). In the presence of 246-CB, the 246-CB enrichment para dehalogenated 23 of the 25 tested congeners. However, only three congeners (34-CB, 2346-CB, and 246-BrB) were dehalogenated in the absence of 246-CB, indicating that these specific congeners initiate dehalogenation in this enrichment culture. The addition of the 2346-CB (para)-dechlorinating enrichment did not further stimulate the 2346-CB-primed dechlorination of the Aroclor 1260 residue in Woods Pond sediment samples. Compared to the addition of the primer 246-CB or the 246-CB unflanked para-dechlorinating enrichment alone, the addition of both 246-CB (300 M) and the 246-CB enrichment stimulated the unflanked para dechlorination of the Aroclor 1260 residue in Woods Pond sediments. These results indicate that the two enrichments contain different PCB-dechlorinating organisms, each with high substrate specificities. Furthermore, bioaugmentation with the enrichment alone did not stimulate the desired dechlorination in PCB-contaminated Woods Pond sediment.

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Section: Discussionmentioning

confidence: 99%

Two anaerobic polychlorinated biphenyl-dehalogenating enrichments that exhibit different para-dechlorination specificities

Wiegel

1997

Appl Environ Microbiol

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“…In most cases, microbial dechlorination of a trichlorobiphenyl in a Silver Lake or a Woods Pond sediment slurry was simply correlated to the trichlorobiphenyl chemical reactivity (4,21), since a dichlorobiphenyl was the terminal dechlorination product. This suggests that PCB congeners with reduction potentials below a specific point are not dechlorinated in these sediments.…”

Section: Discussionmentioning

confidence: 99%

Microbial Reductive Dechlorination of Trichlorobiphenyls in Anaerobic Sediment Slurries

Williams¹

1994

Environ. Sci. Technol.

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“…Anaerobic reductive dechlorination involves the loss of a chlorine substituent and its replacement by a hydrogen. The reduction potential of PCBs increases with increasing chlorine number (6,12). However, the positions of the chlorine substituents also influence ease of reductive dechlorination, which occurs primarily at para-and meta-positions, with the subsequent accumulation of lightly chlorinated orthosubstituted products (11).…”

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Effects of Organic Substrates on Dechlorination of Aroclor 1242 in Anaerobic Sediments

Nies

Vogel

1990

Appl Environ Microbiol

121

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The effects of different organic substrates on the abilities of anaerobic sediment enrichments to reductively dechlorinate polychlorinated biphenyls (PCBs) were studied. Sediments collected from a site previously contaminated with PCBs were dosed with additional PCBs (Aroclor 1242; approximately 300 ppm [300 ,ug/g], sediment dry weight) and incubated anaerobically with acetate, acetone, methanol, or glucose. The pattern of dechlorination was similar for each substrate-fed batch; however, the extents and rates of dechlorination were different. Significant dechlorination over time was observed, with the relative rates and extents of dechlorination being greatest for methanol-, glucose-, and acetone-fed batches and least for acetate-fed batches. Dechlorination occurred primarily on the meta-and para-positions of the highly chlorinated congeners, resulting in the accumulation of less-chlorinated, primarily ortho-substituted products. No significant dechlorination was observed in incubation batches receiving no additional organic substrate, even though identical inorganic nutrients were added to all incubation batches. In addition, dechlorination was not observed in autoclaved controls that received substrate and nutrients. * Corresponding author. incubations without high concentrations of solvents was designed. MATERIALS AND METHODS Chemicals. Aroclor 1242 was provided by the General Electric Co. (Schenectady, N.Y.). All mineral medium chemicals were obtained from Fisher Scientific Co. (Fairlawn, N.J.). Pesticide-free hexane and acetone were obtained from J. T. Baker Chemical Co. (Phillipsburg, N.J.). Methanol was obtained from EM Science (Cherry Hill, N.J.). Octachloronaphthalene was purchased from Ultra Scientific (North Kingstown, R.I.). Mineral medium. The anaerobic mineral medium con

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Interrupted-sweep voltammetry for the identification of polychlorinated biphenyls and naphthalenes

Cited by 33 publications

References 19 publications

Two anaerobic polychlorinated biphenyl-dehalogenating enrichments that exhibit different para-dechlorination specificities

Two anaerobic polychlorinated biphenyl-dehalogenating enrichments that exhibit different para-dechlorination specificities

Microbial Reductive Dechlorination of Trichlorobiphenyls in Anaerobic Sediment Slurries

Effects of Organic Substrates on Dechlorination of Aroclor 1242 in Anaerobic Sediments

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