Linked Life Data

19031864

Source:http://linkedlifedata.com/resource/pubmed/id/19031864

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
21
pubmed:dateCreated
2008-11-26
pubmed:abstractText
We applied the dual isotope system (delta(34)S-delta(18)O--SO4(2-)) to investigate the relevance of bacterial sulfate reduction (BSR) for natural biodegradation in an anaerobic, sulfate rich aquifer contaminated with petroleum hydrocarbons. Isotope fractionation parameters were determined in column experiments operated under near in situ conditions at the site of the contaminated aquifer. Using those fractionation parameters as a reference, we showed that differences between field derived and ex perimental fractionation parameters provide essential information on the determination of secondary sulfur trans formation processes superimposing BSR and competing with the actual biodegradation reactions. Most important of those processes is the reoxidation of reduced sulfur species consuming electron acceptors that would be relevant for contaminant oxidation. Furthermore,the detailed, flow path related analysis of the sulfate isotope distribution pattern revealed that BSR and consequently biodegradation is predominately occurring in hot spots. It also showed the occurrence of sharp hydrochemical gradients that change the natural attenuation potential of the aquifer over a very short distance. Generally, this hydrochemical heterogeneity limits the applicability of isotope investigation for quantifying bacterial sulfate reduction. Nevertheless, the identification of sulfate reducing hot spots and hydrochemical gradients as well as the recognition of geochemical processes competing for electron acceptors are essential to understand natural attenuation of contaminants in aquifers.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0013-936X
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
42
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
7807-12
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Sulfur cycling and biodegradation in contaminated aquifers: insights from stable isotope investigations.
pubmed:affiliation
Department of Isotope Hydrology, UFZ Helmholtz-Centre for Environmental Research, Theodor-Lieser-Str. 4, 06120 Halle/Saale, Germany. kay.knoeller@ufz.de
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't