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HERO ID
2369490
Reference Type
Journal Article
Title
Predominance of Biotic over Abiotic Formation of Halogenated Hydrocarbons in Hypersaline Sediments in Western Australia
Author(s)
Ruecker, A; Weigold, P; Behrens, S; Jochmann, M; Laaks, J; Kappler, A
Year
In Press
Is Peer Reviewed?
1
Journal
Environmental Science & Technology
ISSN:
0013-936X
EISSN:
1520-5851
Language
English
PMID
25073729
DOI
10.1021/es501810g
Web of Science Id
WOS:000340701800029
Abstract
Volatile halogenated organic compounds (VOX) contribute to ozone depletion and global warming. There is evidence of natural VOX formation in many environments ranging from forest soils to salt lakes. Laboratory studies have suggested that VOX formation can be chemically stimulated by reactive Fe species while field studies have provided evidence for direct biological (enzymatic) VOX formation. However, the relative contribution of abiotic and biotic processes to global VOX budgets is still unclear. The goals of this study were to quantify VOX release from sediments from a hypersaline lake in Western Australia (Lake Strawbridge) and to distinguish between the relative contributions of biotic and abiotic VOX formation in microbially active and sterilized microcosms. Our experiments demonstrated that the release of organochlorines from Lake Strawbridge sediments was mainly biotic. Among the organochlorines detected were monochlorinated, e.g., chloromethane (CH3Cl), and higher chlorinated VOX compounds such as trichloromethane (CHCl3). Amendment of sediments with either Fe(III) oxyhydroxide (ferrihydrite) or a mixture of lactate/acetate or both ferrihydrite and lactate/acetate did not stimulate VOX formation. This suggests that although microbial Fe(III) reduction took place, there was no stimulation of VOX formation via Fe redox transformations or the formation of reactive Fe species under our experimental conditions.
Tags
•
Chloroform 2018 Update
TITLE AND ABSTRACT REVIEW
Excluded Studies
•
Chloroform Combined (current)
Chloroform (original)
References: 2000-2018
PubMed
Chloroform (2018 update)
TITLE AND ABSTRACT REVIEW
Excluded Studies
Chloroform (current)
Literature Search: Jan 2009 - March 2017
PubMed
NAAQS
•
ISA-Ozone (2020 Final Project Page)
Literature Search Results
Literature Search - Included
Citation Mapping
Atmospheric Science - Background Ozone
Title-Abstract Screening (SWIFT-AS) - Excluded
SWIFT-AS Excluded
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