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Characterization of Lead Removal from Contaminated Soils by Nontoxic Soil-Washing Agents

Julia W. Neilson, Janick F. Artiola and Raina M. Maier*

Department of Soil, Water, and Environmental Science, Shantz Building, Room 429, Univ. of Arizona, Tucson, AZ 85721



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  		Fig. 1. Lead removal from the Coeur d'Alene River and Camp Navajo soils by two 10 mM diethylenetriamine pentaacetic acid (DTPA) soil washes, two 10 mM rhamnolipid soil washes, toxicity characteristic leaching procedure (TCLP) extraction, and the DTPA soil test for plant-available metals. The error bars represent the standard deviations of triplicate samples. Numbers above the bars indicate the Pb removal in mg kg-1.

 


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  		Fig. 2. Percent metal removed from Coeur d'Alene River and Camp Navajo soils following 10 sequential soil washes with 10 mM rhamnolipid, 5.3% carboxymethyl-ß-cyclodextrin (CMCD), 50 mM Ca(NO3)2, and 10 mM KNO3. The numbers in parentheses represent total metal in mg kg-1.

 


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  		Fig. 3. Cumulative percent metal removed for ten 24-h sequential extractions using 10 mM rhamnolipid.

 


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  		Fig. 4. Cumulative percent metal removed for ten 24-h sequential extractions using 5.3% carboxymethyl-ß-cyclodextrin (CMCD).

 




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