Metal Mobility and Fraction Distribution in a Multimetal Contaminated Soil Chemically Stabilized with Different Agents
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 15, Issue 4
Abstract
To investigate the efficiency of chemical stabilization on soil residuals after soil washing, laboratory batch experiments were performed on a clayish soil contaminated with Cu, Cr, Ni, Pb, Zn with lime, , or a mixture containing under various concentrations. The instant and overall mobility and the fraction distribution of these metals after 7-day stabilization were determined by acid extraction and the modified Tessier’s sequential extraction procedures. Results show that the potential mobility of metals is orders of magnitude much more than instant mobility, and specific attention therefore should be paid to the potential mobility when evaluating the performance of chemical stabilization. Metal fraction analyses suggested that the metal stabilization involved various mechanisms dependent on the metal’s properties, species, and the interference between metals. Among the stabilization combinations, the mixture of and lime most effectively reduced the sum of the metal instant mobility, and achieved the highest efficiency in lessening the corresponding overall mobility. However, a more substantial decrement of instant mobility was observed.
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Acknowledgments
The authors wish to thank the National Natural Science Foundation of China (Project No. NNSFC40802088) for financially supporting this study.
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Published In
Journal of Hazardous, Toxic, and Radioactive Waste
Volume 15 • Issue 4 • October 2011
Pages: 266 - 274
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Apr 7, 2010
Accepted: Jul 23, 2010
Published online: Sep 15, 2011
Published in print: Oct 1, 2011
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