Wet/Dry Cycling Effects on Soil Contaminant Stabilization with Apatite and
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 1
Abstract
Efficacy of stabilizing Ce, Co, and Pb by adding apatite and zero-valent to contaminated wetland sediments was quantified under oxidizing and reducing conditions. The redox status and the general water chemistry of the oxidized and reduced treatments differed greatly, yet the influences of the amendments on contaminant stabilization were quite similar; both amendments significantly reduced aqueous contaminant concentrations. Based on resin sorption studies and thermodynamic calculations, Ce is believed to exist primarily as cationic species and Co as cationic, neutral, and organically complexed species. Based on a series of selective extractions, almost 50% by weight of the Co and Pb were already strongly bound to the sediment, thereby limiting the potential (and need) of affecting additional immobilization through the use of amendments. and combined and apatite additions tended to increase the in situ desorption values more than apatite-only additions.
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Acknowledgments
The writers acknowledge the laboratory and field assistance of Cathy Coffey (SRNL, WSRC). The research was funded by Bechtel Savannah River, Inc. and the Mini-Sabbatical Program at WSRC. The WSRC is operated for the U.S. Department of Energy under Contract No. DOEDE-AC09-96SR18500.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 19 • Issue 1 • January 2007
Pages: 49 - 57
Copyright
© 2007 ASCE.
History
Received: Feb 11, 2005
Accepted: Jul 29, 2005
Published online: Jan 1, 2007
Published in print: Jan 2007
Notes
Note. Associate Editor: Hilary I. Inyang
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