Reductive Dechlorination of α-, β-, γ-, and δ-Hexachlorocyclohexane Isomers with Hydroxocobalamin, in Soil Slurry Systems

2010 ◽  
Vol 44 (18) ◽  
pp. 7063-7069 ◽  
Author(s):  
B. Rodríguez-Garrido ◽  
T. A. Lú-Chau ◽  
G. Feijoo ◽  
F. Macías ◽  
M.C. Monterrroso
Keyword(s):  
Reductive Dechlorination ◽  
Soil Slurry ◽  
Hexachlorocyclohexane Isomers

Anaerobic degradation of hexachlorocyclohexane isomers in liquid and soil slurry systems

Chemosphere ◽  
2005 ◽  
Vol 61 (4) ◽  
pp. 528-536 ◽  
Author(s):  
Juan Carlos Quintero ◽  
Maria Teresa Moreira ◽  
Gumersindo Feijoo ◽  
Juan M. Lema
Keyword(s):  
Anaerobic Degradation ◽  
Soil Slurry ◽  
Hexachlorocyclohexane Isomers

Temperature and pH Effects on Biodegradation of Hexachlorocyclohexane Isomers in Water and a Soil Slurry

2002 ◽  
Vol 50 (18) ◽  
pp. 5070-5076 ◽  
Author(s):  
Tariq Siddique ◽  
Benedict C. Okeke ◽  
Muhammad Arshad ◽  
William T. Frankenberger
Keyword(s):  
Ph Effects ◽  
Soil Slurry ◽  
Hexachlorocyclohexane Isomers

Organochlorine Contaminants in Headwater Peatlands, and Selected Estuary Sites of the Moose River

1986 ◽  
Vol 21 (2) ◽  
pp. 251-256 ◽  
Author(s):  
Robert C. McCrea ◽  
Greg M. Wickware
Keyword(s):  
Atmospheric Deposition ◽  
Organochlorine Pesticides ◽  
River Basin ◽  
Vascular Plants ◽  
Typha Latifolia ◽  
Coastal Marshes ◽  
Surficial Sediments ◽  
Organochlorine Contaminants ◽  
Hexachlorocyclohexane Isomers ◽  
Moose River

Abstract Peatland waters of the Moose River basin, as well as surficial sediments and vascular plants of the estuary were sampled in 1982. Elevated levels of PCBs were found at all five peatland sites; concentrations ranged from 28 to 65 ng/L. Of the seventeen organochlorine pesticides investigated, the hexachlorocyclohexane isomers (a-and y-BHC) were the most prominent with total BHC concentrations ranging from 1.5 to 13.7 ng/L. The presence of these contaminants in ombrotrophic bogs indicated that there was atmospheric deposition of organochlorine contaminants in the basin. Analyses of surficial sediments, collected from tidal flats and coastal marshes, showed that PCBs and organochlorine pesticides were not present. Samples of Triglochin maritima L. seed heads and Typha latifolia L. roots were also free of PCBs.

Reductive Dehalogenation of Environmental Contaminants: A Critical Review

1989 ◽  
Vol 24 (2) ◽  
pp. 299-322 ◽  
Author(s):  
R. M. Baxter
Keyword(s):  
Hydrogen Atom ◽  
Aromatic Compounds ◽  
Reductive Dechlorination ◽  
Halogen Atom ◽  
Environmental Contaminants ◽  
Methanogenic Bacteria ◽  
Photochemical Reactions ◽  
Reductive Dehalogenation ◽  
Iron Porphyrins ◽  
Aliphatic Compounds

Abstract It is generally recognized that reductive processes are more important than oxidative ones in transforming, degrading and mineralizing many environmental contaminants. One process of particular importance is reductive dehalogenation, i.e., the replacement of a halogen atom (most commonly a chlorine atom) by a hydrogen atom. A number of different mechanisms are involved in these reactions. Photochemical reactions probably play a role in some instances. Aliphatic compounds such as chloroethanes, partly aliphatic compounds such as DDT, and alicyclic compounds such as hexachlorocyclohexane are readily dechlorinated in the laboratory by reaction with reduced iron porphyrins such as hematin. Many of these are also dechlorinated by cultures of certain microorganisms, probably by the same mechanism. Such compounds, with a few exceptions, have been found to undergo reductive dechlorination in the environment. Aromatic compounds such as halobenzenes, halophenols and halobenzoic acids appear not to react with reduced iron porphyrins. Some of these however undergo reductive dechlorination both in the environment and in the laboratory. The reaction is generally associated with methanogenic bacteria. There is evidence for the existence of a number of different dechlorinating enzymes specific for different isomers. Recently it has been found that many components of polychlorinated biphenyls (PCBs), long considered to be virtually totally resistant to environmental degradation, may be reductively dechlorinated both in the laboratory and in nature. These findings suggest that many environmental contaminants may prove to be less persistent than was previously feared.

scholarly journals Reductive dechlorination in recalcitrant sources of chloroethenes in the transition zone between aquifers and aquitards

2016 ◽  
Vol 23 (18) ◽  
pp. 18724-18741 ◽  
Author(s):  
Diana Puigserver ◽  
Jofre Herrero ◽  
Mònica Torres ◽  
Amparo Cortés ◽  
Ivonne Nijenhuis ◽  
...  
Keyword(s):  
Transition Zone ◽  
Reductive Dechlorination
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