Influence of Solid Phase Fe(II) on Fe(III) Bioavailability in Aquifer Sediment
Publication: Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 8, Issue 2
Abstract
The availability of Fe(III) for microbial reduction was measured in macrocosms containing contaminated aquifer sediment with benzaldehyde as the organic substrate. Repeated benzaldehyde additions initially resulted in an increase in Fe(II) and decrease in Fe(III). However, after ∼400 h total Fe(II) and Fe(III) stabilized and both ethanol and benzylalcohol began to accumulate, indicating a shift in microbial processes from iron reduction to fermentation. Addition of Fe(III) as amorphous–oxyhydroxide, goethite, and hematite to the Fe(III) depleted sediment stimulated ethanol and benzylalcohol degradation. Washing the sediment with and NaAc to remove sorbed and/or precipitated Fe(II) also stimulated ethanol and benzylalcohol degradation indicating that Fe(II) present on the sediment surface was limiting Fe(III) bioavailability. Selective chemical extraction of the sediment with either 0.5 M HCl or oxalate did not provide a useful indicator of the total bioavailable Fe(III).
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Published In
Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 8 • Issue 2 • April 2004
Pages: 89 - 98
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Mar 5, 2003
Accepted: Mar 5, 2003
Published online: Mar 15, 2004
Published in print: Apr 2004
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