Evaluation of Batch Leaching Procedures for Estimating Metal Mobility in Glaciated Soils |
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| Authors: | Jeffrey A Lackovic Nikolaos P Nikolaidis Pradeep Chheda Robert J Carley Elsie Patton |
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| Institution: | Jeffrey A. Lackovic;is a Ph.D. candidate in the Department of Civil and Environmental Engineering at the University of Connecticut (Box U-37, Storrs, CT 06269-2037). His research interests include interfacial soil chemistry and modeling of soil surface chemical reactions including residual contamination leaching. Nikolaos P. Nikolaidis;is an associate professor of civil and environmental engineering and research engineer of the Environmental Research Institute at the University of Connecticut (Box U-37, Storrs, CT 06269-2037). He received his Ph.D. in civil and environmental engineering from the University of Iowa. He conducts research in heavy metal site assessment and remediation, mathematical modeling, and nonpoint source pollution. Pradeep Chheda;is an assistant professor-in-residence at the Environmental Research Institute at the University of Connecticut (Box U-37, Storrs, CT 06269-2037). He received his Ph. D in environmental engineering from the University of Connecticut. His research interests include hazardous waste treatment, advanced oxidation treatment methods, and colloidal and interfacial chemistry. Robert J. Carley;is the associate director of the Environmental Research Institute and the director of laboratory services at the University of Connecticut (Box U-37, Storrs, CT 06269-2037). His research interests include ambient air monitoring and bench-scale treatability studies with an emphasis on in situ technologies. Elsie Patton;is the assistant director of the Permitting, Enforcement, and Remediation Division, Bureau of Water Management, Connecticut Department of Environmental Protection (79 Elm St., Hartford, CT 06106). She received her B.S. degree from Smith College and M.A. degree from the University of Texas at Austin in geology. She specializes in ground water quality management, remediation, and drinking water supply issues. She is the principal author of Connecticut's remediation standard regulations. |
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| Abstract: | Batch leaching methods have been used for several decades to estimate the potential release of contaminants from soils. Four batch leaching procedures (toxicity characteristic leaching procedure, synthetic precitation leaching procedure, deionized water leaching procedure, and California waste extraction test) were evaluated for their ability to realistically quantify the mobility of metals from previously contaminated glaciated soils. The study was conducted using soils from four different sites (three in Connecticut and one in Maine). The results of the batch leaching procedures were compared with a set of continuous column leaching experiments performed at two different flowrates and two influent pH values. The results suggested that the synthetic precipitation leaching procedure (SPLP) was more realistic than the toxicity characteristic leaching procedure (TCLP), but still a conservative leaching estimate for evaluating the potential for metal mobility in glaciated soils. This study suggests that using SPLP as a test for estimating metal cleanup levels will result in lower remediation costs relative to TCLP or waste extraction test (WET), but still maintain a high level of confidence in the protection of ground water quality. |
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