The dechlorination and degradation of Aroclor 1242

Wright, Michael; Knowles, Christopher J.; Stratford, Jane; Jackman, Simon A.; Robinson, Gary K.

doi:10.1016/s0964-8305(96)00026-1

Cited by 14 publications

(7 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The above methodology involving titanocene chloride, in conjunction with sodium borohydride and pyridine, was extended by other authors to the dechlorination of PCB Arochlor 1242, yielding biphenyl . The dechlorination process resulted in a transient increase in concentration of the monochlorinated biphenyls, particularly 3-chlorobiphenyl.…”

Section: Titaniummentioning

confidence: 99%

Metal-Mediated Reductive Hydrodehalogenation of Organic Halides

2002

View full text Add to dashboard Cite

Section: Titaniummentioning

confidence: 99%

Metal-Mediated Reductive Hydrodehalogenation of Organic Halides

2002

View full text Add to dashboard Cite

“…Prior studies [22,23] have documented several additional pathways to dechlorinate PCBs, with lower-chlorinated PCB congeners undergoing co-metabolic aerobic oxidation through the biphenyl degradation pathway [24]. This pathway is mediated by biphenyl dioxygenase (BPH) enzymes and involves O 2 insertion at adjacent unsubstituted carbons, followed by ring cleavage to form a chlorinated benzoate [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Potential Impacts of PCBs on Sediment Microbiomes in a Tropical Marine Environment

Klaus

Kourafalou

Piggot

et al. 2016

JMSE

View full text Add to dashboard Cite

Within the tropical marine study site of Guánica Bay, Puerto Rico, polychlorinated biphenyls (PCBs) are subjected to coastal and oceanic currents coupled with marine microbial and geochemical processes. To evaluate these processes a hydrodynamic model was developed to simulate the transport of PCBs within nearshore and offshore marine areas of Guánica Bay. Material transport and circulation information from the model were matched with measurements from samples collected from within the bay. These samples, consisting of both intertidal and submerged sediments, were analyzed for physical characteristics (organic carbon, grain size, and mineralogy), microbial characteristics (target bacteria levels and microbial community analyses), presence of PCBs, and PCB-degrading enzymes. Results show that the bay geometry and bathymetry limit the mixing of the extremely high levels of PCBs observed in the eastern portion of the bay. Bay bottom sediments showed the highest levels of PCBs and these sediments were characterized by high organic carbon content and finer grain size. Detectable levels of PCBs were also observed within sediments found along the shore. Microbes from the bay bottom sediments showed a greater relative abundance of microbes from the Chloroflexi, phylum with close phylogenetic associations with known anaerobic PCB-degrading organisms. Based on quantitative PCR measurement of the biphenyl dioxygenase gene, the intertidal sediments showed the greatest potential for aerobic PCB degradation. These results elucidate particular mechanisms of PCB's fate and transport in coastal, tropical marine environments.

show abstract

“…Methods for their degradation include oxidative destruction (Fangmark et al 1993) and reductive methods (Adriaens et al 1996;Sayles et al 1997) but there is a need for a simple treatment technology and bioremediation is a possible candidate. Many chlorinated aromatic compounds are not susceptible to aerobic microbial metabolism, attributable to the chlorine substitutent(s) blocking oxygenase attack (Wright et al 1996, Weigel & Wu 2000, although oxidative metabolism of chlorobenzoate has been coupled to the reduction of Fe(III) (Kazumi et al 1995). The reductive dehalogenation of chlorinated aromatic compounds by sulfate-reducing bacteria (SRB) and other bacteria has been documented (e.g., Bak & Widdel 1986, Tiedje et al 1993 but the mechanisms involved are still obscure.…”

Section: Introductionmentioning

confidence: 99%

Dehalogenation of chlorinated aromatic compounds using a hybrid bioinorganic catalyst on cells of Desulfovibrio desulfuricans

et al. 2004

View full text Add to dashboard Cite

A novel bioinorganic catalyst was obtained via reduction of Pd(II) to Pd0 on to the surface of cells of Desulfovibrio desulfuricans at the expense of H2. Palladised biomass, supplied with formate or H2 as an electron donor, catalysed the dehalogenation of 2-chlorophenol and polychlorinated biphenyls. In the example of 2,3,4,5-tetrachlorobiphenyl, the bioinorganic catalyst promoted a rate of chloride release of 9.33 +/- 0.17 nmol min(-1) mg (-1) and only approximately 5% of this value was obtained using chemically reduced or commercially available Pd0. In the case of 2,2',4,4',6,6'-hexachlorobiphenyl the rate was more than four orders of magnitude faster than the degradation reported using a sulfidogenic culture. Negligible chloride release occurred from any of the chloroaromatic compounds using biomass alone, or from palladised biomass challenged with hexane carrier solvent only. Analysis of the spent solution showed that in addition to catalysis of reductive dehalogenation the new material was able to remove very effectively the organic residua, with neither any PCB nor any breakdown products identifiable by GC/MS.

show abstract

The dechlorination and degradation of Aroclor 1242

Cited by 14 publications

References 10 publications

Metal-Mediated Reductive Hydrodehalogenation of Organic Halides

Metal-Mediated Reductive Hydrodehalogenation of Organic Halides

Potential Impacts of PCBs on Sediment Microbiomes in a Tropical Marine Environment

Dehalogenation of chlorinated aromatic compounds using a hybrid bioinorganic catalyst on cells of Desulfovibrio desulfuricans

Contact Info

Product

Resources

About