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Reductive transformations of halogenated aromatic hydrocarbons in anaerobic water-sediment systems: Kinetics, mechanisms and products

Technical Report ·
OSTI ID:5324355
; ; ;
The degradation of several classes of halogenated aromatic hydrocarbons in methanogenic sediment-water systems was examined in laboratory studies. Several transformation processes were shown to occur, leading to formation of a variety of products. In the study a clear distinction could be made between transformation processes taking place immediately upon incubation of the compounds and processes taking place after a characteristic period of varying length. y-Irradiation was used to quench biological reactions and thus assess the impact of those processes on the overall rates of degradation of the studied compounds. The kinetics of both the initial and the final processes were pseudo-first-order, with half-lives ranging from <0.46 d to no detectable degradation for a number of multiple halogenated benzenes. Compounds were selected with the aim of obtaining a maximum variation in chemical reactivity and physical properties. The sediments were selected with the aim of assessing several environmental factors influencing the kinetics of reduction. (Copyright (c) 1992 SETAC.)
Research Organization:
Environmental Research Lab., Athens, GA (United States). Office of Research and Development
OSTI ID:
5324355
Report Number(s):
PB-92-166818/XAB; EPA--600/J-92/147
Country of Publication:
United States
Language:
English

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Related Subjects

54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring &amp; Transport-- (1990-)
560300 -- Chemicals Metabolism &amp; Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANAEROBIC CONDITIONS
BIODEGRADATION
CHEMICAL REACTIONS
CHEMISTRY
CONTAMINATION
DECOMPOSITION
HYDROCARBONS
HYDROLYSIS
INTERFACES
LYSIS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
POLLUTION
SEDIMENT-WATER INTERFACES
SEDIMENTS
SOLVOLYSIS
WATER CHEMISTRY
WATER POLLUTION