Lead , extraction from contaminated soils

Chen and Hong [126] found that 5-carboxy methyl-L-cysteine was especially effective for the chelating extraction of lead from contaminated soils. The chelator could be recovered and reused over consecutive runs with no loss in performance. 

Figure 2. Lead ccxicentradon in solutitHi following extractitni of lead from contaminated soil using various extractive a nts.

Tawinteung, N., Parkpian, P., DeLaune, R. D., and Jugsujinda, A. (2005). Evaluation of extraction procedures for removing lead from contaminated soil. J. Environ. Sci. Health A 40, 384-407. 

Kim C, Lee Y, Ong SK. Factors affecting EDTA extraction of lead from lead-contaminated soils. Chemosphere 2003 51 845-853. 

Lead was extracted from nine replicates of NIST standard reference material 2709 (a contaminated soil) using various methods. The efficiencies of the various extraction methods were compared. 

Boon DY, Soltanpour PN. 1991. Estimating total lead, cadmium and zinc in contaminated soils from ammonium hydrogen carbonate - DTPA-extractable levels. Commun Soil Science Plant Anal... 

The desorption and vapor extraction system (DAVES) uses a low-temperature fluidized bed to remove volatile and semivolatile organics such as polychlorinated biphenyls (PCBs), polynuclear aromatic compounds (PAHs), pentachlorophenol (PCP), volatile inorganics (tetraethyl lead), and some pesticides from soil, sludge, and sediment. The process generally treats waste containing less than 10% total organic contaminants and 30 to 95% solids. The process does not treat nonvolatile inorganic contaminants such as metals. 

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