Abstract
Heavy metal contamination of soil frequently occurs at hazardous waste sites in many countries of the industrialized world. The use of chelating agents to extract heavy metals from contaminated soils is seen as a treatment method. This research investigated the use of chelator pyridine-2,6-dicarboxylic acid (PDA) to extract cadmium from a spiked soil. Batch equilibration experiments over 24-hr periods were performed to test hypotheses that through a proper choice of chelator: (1) extraction could be made selective toward heavy metals, and (2) extracted metals could be, by simply raising the solution pH, recovered and the chelator reclaimed and reused. The results have shown that PDA extracts and releases cadmium reversibly, and that PDA preferentially complexes with cadmium over competing Fe and Ca ions. Chemical equilibrium modeling was found to be useful for selecting suitable chelating agents and treatment conditions for the extraction and subsequent recovery of metals.
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