Title
Sulfur and oxygen isotope tracing in zero valent iron based : in situ remediation system for metal contaminants Sulfur and oxygen isotope tracing in zero valent iron based : in situ remediation system for metal contaminants
Author
Faculty/Department
Faculty of Sciences. Bioscience Engineering
Publication type
article
Publication
Oxford ,
Subject
Chemistry
Biology
Source (journal)
Chemosphere. - Oxford, 1972, currens
Volume/pages
90(2013) :4 , p. 1366-1371
ISSN
0045-6535
ISI
000314429700006
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
In the present study, controlled laboratory column experiments were conducted to understand the biogeochemical changes during the microbial sulfate reduction. Sulfur and oxygen isotopes of sulfate were followed during sulfate reduction in zero valent iron incubated flow through columns at a constant temperature of 20 +/- 1 degrees C for 90 d. Sulfur isotope signatures show considerable variation during biological sulfate reduction in our columns in comparison to abiotic columns where no changes were observed. The magnitude of the enrichment in delta S-34 values ranged from 9.4%(0) to 10.3%(0) compared to initial value of 2.3%(0), having total fractionation SS between biotic and abiotic columns as much as 6.1%(0). Sulfur isotope fractionation was directly proportional to the sulfate reduction rates in the columns. Oxygen isotopes in this experiment seem less sensitive to microbial activities and more likely to be influenced by isotopic exchange with ambient water. A linear relationship is observed between delta S-34 and delta O-18 in biotic conditions and we also highlight a good relationship between delta S-34 and sulfate reduction rate in biotic columns. (C) 2012 Elsevier Ltd. All rights reserved.
E-info
https://repository.uantwerpen.be/docman/iruaauth/d857e0/a933794.pdf
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