Quantification and Chemical Analysis of Iron Oxidation in Microbially-Reduced Sediments
EMSL Project ID
5091
Abstract
The microbial reduction of iron has been shown to be an important process in the transformation and remediation of contaminated sediments.
Subsequent reoxidation of microbially-reduced iron has been shown to
occur in sediments that experience cycles of oxidation and reduction and
can also impact the fate and extent of contaminant remediation yet little
research has been performed to quantitatively measure the rate of iron
oxidation and chemical structure of the iron species during the oxidation
process. The purpose of this research is to quantify changes in iron
speciation in soil during the reoxidation of microbially reduced soil. The
proposed research involves collaboration between the Department of Civil
and Environmental Engineering at Princeton University and the
Environmental Molecular Sciences Laboratory (EMSL) at Pacific Norwest
National Laboratory.
The soil used was background soil from the Field Research Center (Oak
Ridge, TN) that was part of a 500 day iron reduction and acetate/H2
oxidation experiment. The soil was anaerobically packed into a 2.5cm
diameter, 15 cm long glass column and supplied an oxygenated phosphate
buffered solution. At the beginning of the re-oxidation experiment, all of the
0.5N HCl extractable iron (22 hour extraction) was in the form of Fe(II)
(approximately 80 µmol Fe(II)/g dry soil). Dissolved oxygen is currently
measured over time at the influent and effluent of the column. As the iron
oxidation nears completion, the column will be taken offline and sampled
anaerobically for iron (II)/total iron and then samples will be sent to the
EMSL for further analysis. Samples of the reduced soil before the
experiment began have already been sent to the EMSL. Measurements of
the iron mass balance before and after reoxidation and dissolved oxygen
utilized during reoxidation, combined with chemical analysis performed by
the EMSL, will provide useful information with regards to the rate and
extent of iron oxidation which can be used to help understand the fate of
contaminants in zones that encounter frequent cycles of oxidation and
reduction.
Project Details
Project type
Exploratory Research
Start Date
2003-09-25
End Date
2007-06-03
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
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