Evaluating an Electrokinetically Driven Extraction Method for Measuring Heavy Metal Soil Contamination
Publication: Journal of Environmental Engineering
Volume 132, Issue 4
Abstract
Measuring the heavy metal burden of “old contamination” soils (soils with aged contamination) can be challenging. Many laboratory procedures are currently in use and these can yield a wide range of burden estimates for the same soil. The appropriate extraction method selection depends on the intended use of the information and on compatibility with the procedures used to generate the “reference” data to which results are compared. In this work, results for an extraction based on the electrokinetic mobilization of old contamination heavy metals were compared to the results of established single analyte and sequential extraction methods. Accomplishing extractions electrokinetically offers promise for simplifying processes and for evaluating the electrokinetic remediation potential of old contamination soils. On the brownfield soils tested, electrokinetic extraction identified an average of 82% of the soil’s Cr, Cu, Pb, and Zn burden relative to Environmental Protection Agency Method 3050B extractions. However, results also indicated that neither of these methods were successful at extracting all of the sequestered (residual) fraction of heavy metals and thus underestimated the total contamination burden of the soil.
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Acknowledgments
This research was supported by the National Science Foundation (Grant No. NSFCMS99-01108). The writers gratefully acknowledge the efforts of Ms. Allison Cox, Ms. Sara Hise, Mr. Jun Ma, and Mr. Elijah Petersen for conducting the field sampling and initial laboratory analysis of the “old contamination” soils used in this research.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 132 • Issue 4 • April 2006
Pages: 527 - 537
Copyright
© 2006 ASCE.
History
Received: Feb 3, 2004
Accepted: Aug 16, 2005
Published online: Apr 1, 2006
Published in print: Apr 2006
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